Combination Vehicles
A power unit and one or more towed units.
Getting Started: Understanding the CDL Combination Vehicles Test
Free knowledge base
CDL Combination Vehicles Test — key terms, tricks & tips
Everything from the course in one searchable place: 199 entries. Use it to review before a practice test or look up a word you forgot.
199 results
Endorsement
Special authorization added to a CDL to operate specific vehicles.
Getting Started: Understanding the CDL Combination Vehicles Test
GCWR
Gross Combination Weight Rating; total weight of powered unit and towed unit(s).
Getting Started: Understanding the CDL Combination Vehicles Test
GVWR
Gross Vehicle Weight Rating; maximum operating weight of a single vehicle or unit.
Getting Started: Understanding the CDL Combination Vehicles Test
Knowledge Test
Written exam covering regulations and safe operating practices.
Getting Started: Understanding the CDL Combination Vehicles Test
Skills Test
Practical exam including pre-trip, basic control, and road driving.
Getting Started: Understanding the CDL Combination Vehicles Test
CLP
Commercial Learner's Permit; allows practice driving with a qualified CDL holder.
Getting Started: Understanding the CDL Combination Vehicles Test
Exam Overview: Structure, Scoring, and Endorsement
K-S-E: Know it (written test), Show it (skills test), Earn it (endorsement)!
Getting Started: Understanding the CDL Combination Vehicles Test
Exam Overview: Structure, Scoring, and Endorsement
The California CDL manual specifies that for the Combination Vehicles knowledge test, you must answer at least 40 out of 50 questions correctly (80%) to pass. Keywords to spot in questions often include 'coupling,' 'uncoupling,' 'air brakes,' and 'articulated vehicles.'
Getting Started: Understanding the CDL Combination Vehicles Test
Exam Overview: Structure, Scoring, and Endorsement
Underestimating the importance of the pre-trip inspection on the skills test.
Getting Started: Understanding the CDL Combination Vehicles Test
Exam Overview: Structure, Scoring, and Endorsement
Not thoroughly studying the air brake section of the manual, as it's critical for combination vehicles.
Getting Started: Understanding the CDL Combination Vehicles Test
Exam Overview: Structure, Scoring, and Endorsement
Attempting the skills test without sufficient practice driving a combination vehicle.
Getting Started: Understanding the CDL Combination Vehicles Test
Active Learning
Engaging with material through summarizing, note-taking, or teaching.
Getting Started: Understanding the CDL Combination Vehicles Test
CDL Manual
Official state document with all testable CDL information.
Getting Started: Understanding the CDL Combination Vehicles Test
Combination Vehicle
A power unit and one or more towed units.
Getting Started: Understanding the CDL Combination Vehicles Test
Practice Test
Simulated exam to assess knowledge and identify weak areas.
Getting Started: Understanding the CDL Combination Vehicles Test
Retention
The ability to remember and recall learned information.
Getting Started: Understanding the CDL Combination Vehicles Test
Study Schedule
A planned timetable for dedicated study sessions.
Getting Started: Understanding the CDL Combination Vehicles Test
Visualization
Mentally picturing concepts or procedures to aid understanding.
Getting Started: Understanding the CDL Combination Vehicles Test
Effective Study Strategies for Combination Vehicles
To remember the study cycle: UGLY (Understand, Gather, Learn Actively) SCARY (Schedule, Check).
Getting Started: Understanding the CDL Combination Vehicles Test
Effective Study Strategies for Combination Vehicles
California's CDL manual emphasizes specific details on air brake inspection procedures unique to combination vehicles, including exact pressure drop limits and timing for checks. Memorize these precise figures.
Getting Started: Understanding the CDL Combination Vehicles Test
Effective Study Strategies for Combination Vehicles
Relying solely on third-party apps or outdated online materials without cross-referencing the official CDL manual.
Getting Started: Understanding the CDL Combination Vehicles Test
Effective Study Strategies for Combination Vehicles
Cramming all the information the night before the exam instead of consistent, spaced-out study sessions.
Getting Started: Understanding the CDL Combination Vehicles Test
Effective Study Strategies for Combination Vehicles
Only memorizing answers to practice questions without understanding the underlying concepts or rules.
Getting Started: Understanding the CDL Combination Vehicles Test
Off-tracking
When a trailer's wheels follow a tighter path than the tractor's wheels in a turn.
Mastering Safe Driving Techniques for Combination Vehicles
Jackknifing
When a trailer pushes the tractor from behind, causing it to fold.
Mastering Safe Driving Techniques for Combination Vehicles
Engine Braking
Using the engine's compression to slow the vehicle.
Mastering Safe Driving Techniques for Combination Vehicles
Service Brakes
The primary brakes used for slowing and stopping.
Mastering Safe Driving Techniques for Combination Vehicles
Brake Fade
Loss of braking power due to overheating.
Mastering Safe Driving Techniques for Combination Vehicles
Snubbing
Applying and releasing brakes intermittently on downgrades.
Mastering Safe Driving Techniques for Combination Vehicles
Air Brakes
Braking system using compressed air.
Mastering Safe Driving Techniques for Combination Vehicles
Steering, Braking, and Speed Control for Combos
Think 'S.B.S.' for Steering, Braking, Speed. Remember to be Smooth with Steering, Balanced with Braking, and Smart with Speed.
Mastering Safe Driving Techniques for Combination Vehicles
Steering, Braking, and Speed Control for Combos
The California CDL exam places strong emphasis on understanding air brake systems, including the proper use of the service brake, emergency brake, and parking brake, as well as the effects of brake lag and how to perform air brake pre-trip inspections. Be ready for questions on minimum air pressure and air loss rates.
Mastering Safe Driving Techniques for Combination Vehicles
Steering, Braking, and Speed Control for Combos
Making sudden, jerky steering corrections, which can lead to loss of control.
Mastering Safe Driving Techniques for Combination Vehicles
Steering, Braking, and Speed Control for Combos
Relying solely on service brakes on long downgrades, causing them to overheat and fail.
Mastering Safe Driving Techniques for Combination Vehicles
Steering, Braking, and Speed Control for Combos
Not allowing enough space for off-tracking, resulting in hitting objects or vehicles during turns.
Mastering Safe Driving Techniques for Combination Vehicles
Blind spots
Areas around vehicle not visible in mirrors.
Mastering Safe Driving Techniques for Combination Vehicles
Following distance
Space maintained between your vehicle and the one ahead.
Mastering Safe Driving Techniques for Combination Vehicles
Swing wide
Maneuvering to allow for trailer off-tracking.
Mastering Safe Driving Techniques for Combination Vehicles
Convex mirrors
Curved mirrors showing a wider, smaller view.
Mastering Safe Driving Techniques for Combination Vehicles
Reaction time
Time from seeing hazard to applying brakes.
Mastering Safe Driving Techniques for Combination Vehicles
Stopping distance
Total distance to stop, including reaction and braking.
Mastering Safe Driving Techniques for Combination Vehicles
Gap
Sufficient space between vehicles for safe entry.
Mastering Safe Driving Techniques for Combination Vehicles
Turning, Lane Changes, and Following Distance
For turns, think 'SWARM': **S**ignal, **W**ide, **A**ll mirrors, **R**educe speed, **M**aintain path.
Mastering Safe Driving Techniques for Combination Vehicles
Turning, Lane Changes, and Following Distance
The California CDL exam emphasizes the 'one second per 10 feet of vehicle length' rule for following distance, adding an extra second for speeds over 40 mph. For example, a 40-foot vehicle at 55 mph needs 4 seconds (40/10) + 1 second (over 40 mph) = 5 seconds. Memorize this calculation.
Mastering Safe Driving Techniques for Combination Vehicles
Turning, Lane Changes, and Following Distance
Not swinging wide enough for turns, causing the trailer to hit curbs or other objects.
Mastering Safe Driving Techniques for Combination Vehicles
Turning, Lane Changes, and Following Distance
Failing to check all blind spots before a lane change, leading to side-swipe collisions.
Mastering Safe Driving Techniques for Combination Vehicles
Turning, Lane Changes, and Following Distance
Following too closely, especially in adverse weather, which drastically reduces stopping time.
Mastering Safe Driving Techniques for Combination Vehicles
GOAL
Get Out And Look; physically inspect surroundings.
Mastering Safe Driving Techniques for Combination Vehicles
Jackknife
Trailer swings sharply, forming an acute angle with tractor.
Mastering Safe Driving Techniques for Combination Vehicles
Blind Spot
Areas around vehicle not visible in mirrors.
Mastering Safe Driving Techniques for Combination Vehicles
Landing Gear
Retractable legs supporting a detached trailer.
Mastering Safe Driving Techniques for Combination Vehicles
Chocks
Wedges placed against wheels to prevent movement.
Mastering Safe Driving Techniques for Combination Vehicles
Black Ice
Thin, transparent layer of ice on road surface.
Mastering Safe Driving Techniques for Combination Vehicles
Pre-trip Inspection
Thorough check of vehicle before starting a trip.
Mastering Safe Driving Techniques for Combination Vehicles
Backing, Parking, and Navigating Hazards
For parking on a grade, remember 'DOWN-TOWARDS, UP-AWAY.' Downhill, turn wheels TOWARDS the curb. Uphill, turn wheels AWAY from the curb.
Mastering Safe Driving Techniques for Combination Vehicles
Backing, Parking, and Navigating Hazards
The California CDL exam emphasizes specific parking rules for grades. Remember: 'Turn wheels toward the curb on a downgrade, away from the curb on an upgrade.' This is a common test question.
Mastering Safe Driving Techniques for Combination Vehicles
Backing, Parking, and Navigating Hazards
Over-steering when backing, leading to jackknifing.
Mastering Safe Driving Techniques for Combination Vehicles
Backing, Parking, and Navigating Hazards
Not using chocks or setting parking brakes properly, resulting in runaway vehicles.
Mastering Safe Driving Techniques for Combination Vehicles
Backing, Parking, and Navigating Hazards
Swerving to avoid a hazard instead of controlled braking, risking rollover.
Mastering Safe Driving Techniques for Combination Vehicles
Defensive Driving
Driving to anticipate hazards and avoid accidents.
Mastering Safe Driving Techniques for Combination Vehicles
Evasive Steering
Quick steering to avoid an obstacle.
Mastering Safe Driving Techniques for Combination Vehicles
Drive-Wheel Skid
Tractor's drive wheels lose traction.
Mastering Safe Driving Techniques for Combination Vehicles
Trailer Skid (Jackknife)
Trailer pushes the tractor sideways.
Mastering Safe Driving Techniques for Combination Vehicles
Tire Blowout
Sudden loss of air pressure in a tire.
Mastering Safe Driving Techniques for Combination Vehicles
Escape Route
A clear path to avoid a collision.
Mastering Safe Driving Techniques for Combination Vehicles
Defensive Driving and Emergency Maneuvers
SKID: S-teer into it, K-eep off brakes, I-f trailer, D-rive out of it.
Mastering Safe Driving Techniques for Combination Vehicles
Defensive Driving and Emergency Maneuvers
The California CDL exam emphasizes understanding the difference between drive-wheel skids and trailer skids, and the correct recovery actions for each. Pay close attention to questions about applying brakes during a jackknife.
Mastering Safe Driving Techniques for Combination Vehicles
Defensive Driving and Emergency Maneuvers
Applying the trailer hand valve during a trailer jackknife, which will worsen the skid.
Mastering Safe Driving Techniques for Combination Vehicles
Defensive Driving and Emergency Maneuvers
Braking hard during a tire blowout, especially a front tire, which can lead to loss of control.
Mastering Safe Driving Techniques for Combination Vehicles
Defensive Driving and Emergency Maneuvers
Not checking mirrors frequently enough, leading to unawareness of vehicles in blind spots or potential escape routes.
Mastering Safe Driving Techniques for Combination Vehicles
Fifth Wheel
Coupling device on tractor for trailer kingpin.
Coupling and Uncoupling Procedures for Combination Vehicles
Kingpin
Vertical pin on trailer connecting to fifth wheel.
Coupling and Uncoupling Procedures for Combination Vehicles
Apron
Flat plate on trailer around the kingpin.
Coupling and Uncoupling Procedures for Combination Vehicles
Coupling
Process of connecting tractor to trailer.
Coupling and Uncoupling Procedures for Combination Vehicles
Uncoupling
Process of disconnecting tractor from trailer.
Coupling and Uncoupling Procedures for Combination Vehicles
Pre-Coupling Checks and Alignment
Remember 'FILM': **F**ifth wheel, **I**nspect trailer, **L**ubricate, **M**atch height.
Coupling and Uncoupling Procedures for Combination Vehicles
Pre-Coupling Checks and Alignment
The California CDL exam emphasizes checking the fifth wheel for proper lubrication and ensuring the trailer's landing gear is fully raised after coupling. Pay attention to questions about fifth wheel height relative to the kingpin.
Coupling and Uncoupling Procedures for Combination Vehicles
Pre-Coupling Checks and Alignment
Forgetting to check if the trailer brakes are set or if the wheels are chocked.
Coupling and Uncoupling Procedures for Combination Vehicles
Pre-Coupling Checks and Alignment
Backing too fast, leading to improper alignment or damaging the kingpin/fifth wheel.
Coupling and Uncoupling Procedures for Combination Vehicles
Pre-Coupling Checks and Alignment
Not ensuring the fifth wheel jaws are open before attempting to back under the trailer.
Coupling and Uncoupling Procedures for Combination Vehicles
Apron Plate
Flat plate on trailer's underside that rests on fifth wheel.
Coupling and Uncoupling Procedures for Combination Vehicles
Jaws (Fifth Wheel)
Locking mechanism within fifth wheel that grips kingpin.
Coupling and Uncoupling Procedures for Combination Vehicles
Tug Test
Gentle pull forward with tractor to verify coupling security.
Coupling and Uncoupling Procedures for Combination Vehicles
Release Handle
Lever on fifth wheel used to open jaws for uncoupling.
Coupling and Uncoupling Procedures for Combination Vehicles
Connecting Fifth Wheel, Kingpin, and Landing Gear
Think 'CALM' for Coupling: Check alignment, Approach slowly, Lock kingpin, Make contact, Tug test.
Coupling and Uncoupling Procedures for Combination Vehicles
Connecting Fifth Wheel, Kingpin, and Landing Gear
The California CDL exam places strong emphasis on the visual inspection of the fifth wheel and kingpin connection. Be prepared to identify a properly locked kingpin and the absence of gaps. Memorize the 'no gap' rule.
Coupling and Uncoupling Procedures for Combination Vehicles
Connecting Fifth Wheel, Kingpin, and Landing Gear
Not checking for a gap between the fifth wheel and the trailer apron plate, which indicates an incomplete connection.
Coupling and Uncoupling Procedures for Combination Vehicles
Connecting Fifth Wheel, Kingpin, and Landing Gear
Forgetting to raise the landing gear completely, leading to damage or hazards while driving.
Coupling and Uncoupling Procedures for Combination Vehicles
Connecting Fifth Wheel, Kingpin, and Landing Gear
Failing to perform a tug test, risking the trailer detaching during travel.
Coupling and Uncoupling Procedures for Combination Vehicles
Service Line
Blue air line, controls trailer brakes.
Coupling and Uncoupling Procedures for Combination Vehicles
Emergency Line
Red air line, supplies continuous air to trailer.
Coupling and Uncoupling Procedures for Combination Vehicles
Glad Hands
Couplings connecting air lines between units.
Coupling and Uncoupling Procedures for Combination Vehicles
7-Way Cable
Electrical cable powering trailer lights/systems.
Coupling and Uncoupling Procedures for Combination Vehicles
Trailer Supply Valve
Dash control to send air to trailer.
Coupling and Uncoupling Procedures for Combination Vehicles
Air Leak
Unintended escape of air pressure.
Coupling and Uncoupling Procedures for Combination Vehicles
Air and Electrical Line Connections and Safety Checks
RED for Emergency, BLUE for Service. Think: 'Red means Stop (emergency brakes), Blue means Go (service brakes).'
Coupling and Uncoupling Procedures for Combination Vehicles
Air and Electrical Line Connections and Safety Checks
The California CDL exam often emphasizes the importance of checking glad hand seals for damage or cracks during pre-trip inspections, as well as securing electrical lines to prevent dragging.
Coupling and Uncoupling Procedures for Combination Vehicles
Air and Electrical Line Connections and Safety Checks
Forgetting to open the trailer supply valve, leading to no trailer air pressure.
Coupling and Uncoupling Procedures for Combination Vehicles
Air and Electrical Line Connections and Safety Checks
Not securing the electrical cable, causing it to drag and get damaged.
Coupling and Uncoupling Procedures for Combination Vehicles
Air and Electrical Line Connections and Safety Checks
Failing to check for air leaks after connecting glad hands, which can lead to brake failure.
Coupling and Uncoupling Procedures for Combination Vehicles
Dummy Couplers
Storage points for air lines when not connected to a trailer.
Coupling and Uncoupling Procedures for Combination Vehicles
Wheel Chocks
Wedge-shaped blocks placed under wheels to prevent movement.
Coupling and Uncoupling Procedures for Combination Vehicles
Uncoupling Procedures and Post-Uncoupling Checks
L.A.D.R.P.S. – Level ground, Air/electrical, Disconnect, Release fifth wheel, Pull away, Secure trailer.
Coupling and Uncoupling Procedures for Combination Vehicles
Uncoupling Procedures and Post-Uncoupling Checks
California CDL exams often emphasize the importance of securing air and electrical lines to prevent damage and ensure safety. Remember to properly stow glad hands on dummy couplers and secure the electrical cord.
Coupling and Uncoupling Procedures for Combination Vehicles
Uncoupling Procedures and Post-Uncoupling Checks
Forgetting to apply parking brakes before uncoupling, leading to vehicle movement.
Coupling and Uncoupling Procedures for Combination Vehicles
Uncoupling Procedures and Post-Uncoupling Checks
Not lowering landing gear sufficiently, causing the trailer to fall when the tractor pulls away.
Coupling and Uncoupling Procedures for Combination Vehicles
Uncoupling Procedures and Post-Uncoupling Checks
Failing to disconnect air and electrical lines before pulling away, damaging equipment.
Coupling and Uncoupling Procedures for Combination Vehicles
Air Compressor
Pumps air into the air storage tanks.
Understanding and Operating Combination Vehicle Air Brakes
Air Tanks (Reservoirs)
Store compressed air for the brake system.
Understanding and Operating Combination Vehicle Air Brakes
Air Dryer
Removes moisture and oil from compressed air.
Understanding and Operating Combination Vehicle Air Brakes
Foot Valve
Controls air pressure sent to brake chambers.
Understanding and Operating Combination Vehicle Air Brakes
Brake Chambers
Convert air pressure into mechanical force.
Understanding and Operating Combination Vehicle Air Brakes
Slack Adjuster
Adjusts the distance the brake shoes move.
Understanding and Operating Combination Vehicle Air Brakes
S-Cam
Forces brake shoes against the drum.
Understanding and Operating Combination Vehicle Air Brakes
Gladhands
Coupling devices for air lines between tractor/trailer.
Understanding and Operating Combination Vehicle Air Brakes
Air Brake System Components and Function
Compressor Pushes Air, Tanks Store it, Dryer Cleans it, Foot Pushes Brakes, Chambers Move Shoes.
Understanding and Operating Combination Vehicle Air Brakes
Air Brake System Components and Function
The California CDL exam places a strong emphasis on understanding the function of each air brake component and the correct procedures for daily inspections, especially draining air tanks and checking for leaks. Pay attention to specific pressure ranges for warnings and cut-out/cut-in.
Understanding and Operating Combination Vehicle Air Brakes
Air Brake System Components and Function
Forgetting to drain air tanks daily, leading to water contamination and freezing.
Understanding and Operating Combination Vehicle Air Brakes
Air Brake System Components and Function
Ignoring low air pressure warnings, risking complete brake failure.
Understanding and Operating Combination Vehicle Air Brakes
Air Brake System Components and Function
Not understanding the difference between the red (supply) and blue (service) air lines for combination vehicles.
Understanding and Operating Combination Vehicle Air Brakes
Air Brake System Components and Function
Failing to check gladhand connections for leaks during pre-trip inspection.
Understanding and Operating Combination Vehicle Air Brakes
Service Brake
Foot-operated brake for normal stopping.
Understanding and Operating Combination Vehicle Air Brakes
Controlled Braking
Applying brakes firmly without locking wheels.
Understanding and Operating Combination Vehicle Air Brakes
Stab Braking
Full brake application, then full release, repeated.
Understanding and Operating Combination Vehicle Air Brakes
Basic Air Brake Operation and Emergency Braking
For 'Controlled Braking,' think 'Control Your Roll!' – keep those wheels rolling for steering. For 'Stab Braking,' think 'Stab and Release!' – like a quick, sharp jab.
Understanding and Operating Combination Vehicle Air Brakes
Basic Air Brake Operation and Emergency Braking
The California CDL exam emphasizes understanding the difference between controlled braking and stab braking, and when to use each. Pay close attention to questions about preventing jackknifing, especially by avoiding locked wheels.
Understanding and Operating Combination Vehicle Air Brakes
Basic Air Brake Operation and Emergency Braking
Locking the wheels during an emergency stop, leading to loss of steering control and potential jackknifing.
Understanding and Operating Combination Vehicle Air Brakes
Basic Air Brake Operation and Emergency Braking
Not knowing whether your vehicle has ABS, making it difficult to choose the correct emergency braking technique.
Understanding and Operating Combination Vehicle Air Brakes
Basic Air Brake Operation and Emergency Braking
Applying too little pressure during an emergency, resulting in a longer stopping distance.
Understanding and Operating Combination Vehicle Air Brakes
Governor Cut-Out
Pressure at which the air compressor stops pumping air.
Understanding and Operating Combination Vehicle Air Brakes
Air Leakage Test
Checks for air pressure loss in the brake system over time.
Understanding and Operating Combination Vehicle Air Brakes
Low Air Warning
Alarm that activates when air pressure drops below a safe level (e.g., 60 psi).
Understanding and Operating Combination Vehicle Air Brakes
Spring Brakes
Emergency brakes that apply when air pressure is lost.
Understanding and Operating Combination Vehicle Air Brakes
Service Brake Test
Checks if the foot brake applies evenly and stops the vehicle straight.
Understanding and Operating Combination Vehicle Air Brakes
Tractor Protection Valve
Automatically closes off air to the trailer if air pressure drops too low.
Understanding and Operating Combination Vehicle Air Brakes
Air Brake Inspection and Performance Tests
Think 'L-E-S-S': Leakage, Emergency, Service, System Check. It's the order of your air brake tests!
Understanding and Operating Combination Vehicle Air Brakes
Air Brake Inspection and Performance Tests
The California CDL exam places strong emphasis on the specific PSI values for air brake tests. Memorize the 3 psi drop for single vehicles and 4 psi drop for combination vehicles during the leakage test, and the 55-75 psi range for the low air warning signal.
Understanding and Operating Combination Vehicle Air Brakes
Air Brake Inspection and Performance Tests
Forgetting to chock the wheels before starting the inspection.
Understanding and Operating Combination Vehicle Air Brakes
Air Brake Inspection and Performance Tests
Not holding the foot brake firmly enough during the leakage test.
Understanding and Operating Combination Vehicle Air Brakes
Air Brake Inspection and Performance Tests
Ignoring slight air pressure drops, thinking they are insignificant.
Understanding and Operating Combination Vehicle Air Brakes
ABS
Anti-lock Braking System; prevents wheel lock-up
Understanding and Operating Combination Vehicle Air Brakes
Wheel Speed Sensor
Monitors rotational speed of each wheel
Understanding and Operating Combination Vehicle Air Brakes
ECU
Electronic Control Unit; the 'brain' of the ABS system
Understanding and Operating Combination Vehicle Air Brakes
Modulator Valve
Adjusts air pressure to brake chambers rapidly
Understanding and Operating Combination Vehicle Air Brakes
Brake Pulsation
Feeling of rapid vibration in brake pedal during ABS activation
Understanding and Operating Combination Vehicle Air Brakes
Trailer Swing
Trailer wheels lock up, causing it to swing sideways
Understanding and Operating Combination Vehicle Air Brakes
Anti-lock Braking Systems (ABS) for Combination Vehicles
ABS: Always Brake Steadily. Don't pump, just press and steer!
Understanding and Operating Combination Vehicle Air Brakes
Anti-lock Braking Systems (ABS) for Combination Vehicles
The California CDL exam emphasizes that ABS does NOT shorten stopping distance under all conditions, but primarily helps maintain steering control. Remember that ABS lights on the tractor and trailer (if equipped) must be checked during the pre-trip inspection.
Understanding and Operating Combination Vehicle Air Brakes
Anti-lock Braking Systems (ABS) for Combination Vehicles
Pumping the brakes when ABS is active, which disables its effectiveness.
Understanding and Operating Combination Vehicle Air Brakes
Anti-lock Braking Systems (ABS) for Combination Vehicles
Ignoring an illuminated ABS warning light, assuming the vehicle is safe to drive.
Understanding and Operating Combination Vehicle Air Brakes
Anti-lock Braking Systems (ABS) for Combination Vehicles
Believing ABS always shortens stopping distances, rather than primarily aiding control.
Understanding and Operating Combination Vehicle Air Brakes
Alternator
Generates electricity for the vehicle's electrical system.
Comprehensive Inspection of Combination Vehicles
Water Pump
Circulates coolant to regulate engine temperature.
Comprehensive Inspection of Combination Vehicles
Coolant Reservoir
Holds excess engine coolant for expansion/contraction.
Comprehensive Inspection of Combination Vehicles
Dipstick
A tool used to measure fluid levels, like oil or power steering.
Comprehensive Inspection of Combination Vehicles
Reflective Triangles
Used to warn other drivers of a parked or disabled vehicle.
Comprehensive Inspection of Combination Vehicles
Fire Extinguisher
Device to put out small fires, required safety equipment.
Comprehensive Inspection of Combination Vehicles
Battery Terminals
Connection points on the battery for electrical cables.
Comprehensive Inspection of Combination Vehicles
Pre-Trip Inspection: Engine, Fluids, and Safety Gear
F-L-U-I-D-S: **F**ire extinguisher, **L**eaks, **U**nder the hood, **I**nspect belts, **D**ipsticks, **S**afety gear.
Comprehensive Inspection of Combination Vehicles
Pre-Trip Inspection: Engine, Fluids, and Safety Gear
The California CDL exam specifically checks for a properly charged and mounted fire extinguisher (minimum 5 B:C rating) and three reflective warning triangles. Ensure you know the exact type and number required.
Comprehensive Inspection of Combination Vehicles
Pre-Trip Inspection: Engine, Fluids, and Safety Gear
Forgetting to check under the vehicle for leaks after checking under the hood.
Comprehensive Inspection of Combination Vehicles
Pre-Trip Inspection: Engine, Fluids, and Safety Gear
Not checking the charge on the fire extinguisher or ensuring it's properly mounted.
Comprehensive Inspection of Combination Vehicles
Pre-Trip Inspection: Engine, Fluids, and Safety Gear
Only visually checking fluid levels without using dipsticks where required.
Comprehensive Inspection of Combination Vehicles
Tread Depth
Measurement of tire groove depth for traction.
Comprehensive Inspection of Combination Vehicles
Sidewall
The side part of a tire, prone to bulges or cuts.
Comprehensive Inspection of Combination Vehicles
Clearance Lights
Lights indicating vehicle width and height.
Comprehensive Inspection of Combination Vehicles
Identification Lights
Three amber lights on front/rear of vehicles over 80 inches wide.
Comprehensive Inspection of Combination Vehicles
Brake Chamber
Converts air pressure into mechanical force for braking.
Comprehensive Inspection of Combination Vehicles
Dual Tires
Two tires mounted side-by-side on one wheel position.
Comprehensive Inspection of Combination Vehicles
Regrooved Tires
Tires with new tread cut into worn tread; illegal on steering axles.
Comprehensive Inspection of Combination Vehicles
Tires, Lights, and Under-Vehicle Inspection
Think 'T.L.U.B.' for Tires, Lights, Under-vehicle, and Brakes! It's your routine for a safe trip.
Comprehensive Inspection of Combination Vehicles
Tires, Lights, and Under-Vehicle Inspection
The California CDL exam places specific emphasis on tire tread depth requirements: 4/32 inch for steering axle tires and 2/32 inch for all other tires. Memorize these exact numbers.
Comprehensive Inspection of Combination Vehicles
Tires, Lights, and Under-Vehicle Inspection
Not checking inside dual tires for damage or proper inflation.
Comprehensive Inspection of Combination Vehicles
Tires, Lights, and Under-Vehicle Inspection
Ignoring dirty or dim lights, assuming they are 'good enough'.
Comprehensive Inspection of Combination Vehicles
Tires, Lights, and Under-Vehicle Inspection
Failing to get under the vehicle to look for leaks or loose components.
Comprehensive Inspection of Combination Vehicles
Blocking
Placing objects against cargo to prevent movement.
Comprehensive Inspection of Combination Vehicles
Bracing
Using devices to fill voids and prevent cargo shifting.
Comprehensive Inspection of Combination Vehicles
Tie-downs
Chains, straps, or ropes securing cargo to the vehicle.
Comprehensive Inspection of Combination Vehicles
Working Load Limit (WLL)
Maximum weight a securement device can safely hold.
Comprehensive Inspection of Combination Vehicles
Gross Vehicle Weight (GVW)
Total weight of vehicle and its cargo.
Comprehensive Inspection of Combination Vehicles
Dunnage
Material used to support or cushion cargo.
Comprehensive Inspection of Combination Vehicles
En Route Check
Mandatory cargo inspection during a trip.
Comprehensive Inspection of Combination Vehicles
Cargo Securement and En Route Checks
For 'Cargo Checks': 'C' for Check within 50 miles, 'C' for Check every 3 hours/150 miles. 'C' for Constant vigilance!
Comprehensive Inspection of Combination Vehicles
Cargo Securement and En Route Checks
The California CDL exam emphasizes knowing the specific intervals for en route cargo checks: within the first 50 miles, and then every 3 hours or 150 miles, or whenever duty status changes. Memorize these specific numbers.
Comprehensive Inspection of Combination Vehicles
Cargo Securement and En Route Checks
Not performing the initial 50-mile cargo check.
Comprehensive Inspection of Combination Vehicles
Cargo Securement and En Route Checks
Underestimating the number of tie-downs needed for a given load.
Comprehensive Inspection of Combination Vehicles
Cargo Securement and En Route Checks
Using damaged or worn-out securement devices.
Comprehensive Inspection of Combination Vehicles
Post-Trip Inspection
Checking vehicle after a trip for defects.
Comprehensive Inspection of Combination Vehicles
DVIR
Driver's Vehicle Inspection Report, a legal document.
Comprehensive Inspection of Combination Vehicles
Motor Carrier
The company responsible for operating the CMV.
Comprehensive Inspection of Combination Vehicles
Defect
Any fault or imperfection in the vehicle.
Comprehensive Inspection of Combination Vehicles
49 CFR Part 396.11
Federal regulation for post-trip inspections.
Comprehensive Inspection of Combination Vehicles
Out-of-Service Order
Prohibition from operating a vehicle due to defects.
Comprehensive Inspection of Combination Vehicles
Post-Trip Inspection and Reporting Defects
After Driving, Report Everything (ADRE): Always inspect, Document defects, Report to employer, Ensure safety.
Comprehensive Inspection of Combination Vehicles
Post-Trip Inspection and Reporting Defects
California requires drivers to complete a DVIR at the end of each work day for each vehicle operated. Even if no defects are found, the DVIR must be completed and signed. Keywords: 'end of work day', 'each vehicle', 'no defects'.
Comprehensive Inspection of Combination Vehicles
Post-Trip Inspection and Reporting Defects
Not completing a DVIR if no defects are found.
Comprehensive Inspection of Combination Vehicles
Post-Trip Inspection and Reporting Defects
Failing to thoroughly inspect all critical components.
Comprehensive Inspection of Combination Vehicles
Post-Trip Inspection and Reporting Defects
Not reporting minor defects, assuming they are insignificant.
Comprehensive Inspection of Combination Vehicles