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Automobile & Light Truck Certification Test A5 Brakes practice questions

216 free questions with answers and explanations.

Practice test
  1. 51.A technician is troubleshooting a vehicle that exhibits a 'dragging' brake on the front left wheel after the brake pedal is released. The master cylinder is functioning correctly, and the caliper slides are well-lubricated. What is the MOST likely cause of this condition?Hydraulic System Diagnosis and Repair
  2. 52.A technician is bleeding a hydraulic brake system that uses a diagonal split. After bleeding the right rear and left front wheels, the technician notices the brake pedal still feels spongy. Which of the following is the MOST likely next step to properly bleed the system?Hydraulic System Diagnosis and Repair
  3. 53.A technician is replacing a corroded steel brake line. After installing the new line, they must form a new flare. Which type of flare is typically used for automotive brake lines in domestic and Asian vehicles?Hydraulic System Diagnosis and Repair
  4. 54.A technician is inspecting a vehicle for a brake fluid leak. They discover a small leak at the connection point between a steel brake line and a brass fitting. Which of the following is the MOST likely cause of this leak?Hydraulic System Diagnosis and Repair
  5. 55.A vehicle with an ABS system exhibits a 'hard pedal' symptom. After inspecting the conventional hydraulic components and finding no issues, the technician suspects an ABS-related problem. Which of the following ABS components, if faulty, could cause a hard pedal?Hydraulic System Diagnosis and Repair
  6. 56.A vehicle's brake system requires DOT 4 brake fluid. A technician accidentally adds DOT 3 fluid during a top-off. What is the MOST likely immediate consequence?Hydraulic System Diagnosis and Repair
  7. 57.A vehicle's brake system utilizes a low-drag caliper design. To ensure proper operation after pad replacement, which of the following bleeding procedures is MOST likely recommended by the manufacturer?Hydraulic System Diagnosis and Repair
  8. 58.A technician is diagnosing a vehicle with a spongy brake pedal that gradually firms up after several rapid pumps. There are no visible external leaks. Which of the following is the MOST likely cause?Hydraulic System Diagnosis and Repair
  9. 59.A technician is performing a diagnostic on a vehicle with Anti-lock Braking System (ABS) and Traction Control System (TCS). The client reports an intermittent 'hard pedal' sensation, usually after driving for a while, and the ABS/TCS warning lights occasionally illuminate. After checking conventional brake components, the technician connects a scan tool and retrieves Diagnostic Trouble Code (DTC) C0265: 'ECU Malfunction / Relay Circuit Failure'. Which of the following components is MOST likely at fault?Hydraulic System Diagnosis and Repair
  10. 60.A technician is performing a fluid flush on a vehicle's brake system. After flushing the system with new fluid, the customer complains of a 'spongy' pedal. The technician re-bleeds the system multiple times, but the spongy feel persists. During the flush, the technician used a pressure bleeder and noticed the fluid level in the master cylinder reservoir dropped critically low at one point. What is the MOST likely cause of the persistent spongy pedal?Hydraulic System Diagnosis and Repair
  11. 61.A technician is diagnosing a vehicle with a spongy brake pedal that gradually firms up after several pumps. The master cylinder reservoir is full, and there are no visible external leaks. The technician suspects air in the hydraulic system. If bleeding the brakes manually does not resolve the issue, and the problem persists, which of the following is the MOST likely location for the trapped air?Hydraulic System Diagnosis and Repair
  12. 62.A vehicle owner reports that their brake pedal occasionally feels 'mushy' or 'soft' after driving for an extended period, especially in stop-and-go traffic or during heavy braking. The fluid level is correct, and there are no external leaks. The technician suspects a problem with the brake fluid itself. Which of the following fluid properties is MOST likely compromised?Hydraulic System Diagnosis and Repair
  13. 63.A technician is installing a new section of steel brake line. After double flaring the end of the line, they attempt to connect it to a caliper. The fitting threads on easily, but when tightened, a small leak persists. The technician confirms the flare nut is the correct size and the line is not cross-threaded. What is the MOST likely cause of the leak?Hydraulic System Diagnosis and Repair
  14. 64.A technician is performing a fluid flush on an ABS-equipped vehicle. After connecting a pressure bleeder, they are advised to cycle the ABS solenoids and pump motor using a scan tool. Why is this step necessary for a complete fluid flush in some ABS systems?Hydraulic System Diagnosis and Repair
  15. 65.A technician is diagnosing a vehicle with a brake fluid leak. They trace the leak to a steel brake line that has a small, pinhole-sized perforation in a section that runs along the frame. The vehicle owner states the leak developed suddenly after driving on a heavily salted road. Which type of brake line damage is MOST likely occurring?Hydraulic System Diagnosis and Repair
  16. 66.A technician is diagnosing a vehicle with a spongy brake pedal that gradually firms up after several rapid pumps. There are no external leaks, and the master cylinder reservoir is full. Which of the following is the MOST likely cause of this symptom?Hydraulic System Diagnosis and Repair
  17. 67.A technician is performing a brake inspection on an older vehicle equipped with a combination valve. The front brakes lock up prematurely during a hard stop, while the rear wheels barely engage. Which of the following is the MOST likely cause?Hydraulic System Diagnosis and Repair
  18. 68.A technician is inspecting a vehicle with a complaint of a squealing noise during braking. They find that the front brake pads are severely worn, and the brake fluid reservoir is noticeably low. What is the most appropriate immediate action regarding the brake fluid?Hydraulic System Diagnosis and Repair
  19. 69.A technician is evaluating a brake system with a Proportioning Valve. The purpose of this valve is to:Hydraulic System Diagnosis and Repair
  20. 70.A technician is evaluating a vehicle with a spongy brake pedal and excessive pedal travel. There are no external leaks, and the master cylinder reservoir is full. The technician suspects air in the system, but traditional bleeding methods (manual and pressure) have failed to completely resolve the issue. The vehicle is equipped with an Anti-lock Braking System (ABS). What specific procedure might be required to remove trapped air?Hydraulic System Diagnosis and Repair
  21. 71.A technician is performing a bench bleed on a new master cylinder. After filling the reservoir and cycling the pistons, they notice small air bubbles continue to appear in the fluid being returned to the reservoir, even after numerous cycles. What is the MOST likely reason for this persistent aeration?Hydraulic System Diagnosis and Repair
  22. 72.A customer complains of a brake pedal that slowly sinks to the floor when constant pressure is applied, but there are no external leaks visible. A technician suspects an internal master cylinder issue. Which of the following is the MOST likely cause?Hydraulic System Diagnosis and Repair
  23. 73.A vehicle with an Anti-lock Braking System (ABS) has a 'hard pedal' symptom, but only when the ABS system is actively engaging, such as during a panic stop on a slippery surface. The conventional braking feels normal. Additionally, the ABS warning light illuminates ONLY during these active ABS events. Which of the following is the MOST likely cause?Hydraulic System Diagnosis and Repair
  24. 74.A technician is replacing a brake hose that connects the steel brake line to the caliper. What type of line fitting is MOST commonly used at the steel line connection point?Hydraulic System Diagnosis and Repair
  25. 75.A technician is evaluating a brake system that uses a combination valve. The vehicle exhibits normal braking under light pedal pressure, but when heavy braking is applied, the rear wheels tend to lock up prematurely. The front brakes seem to be doing most of the work. Which function of the combination valve is MOST likely failing?Hydraulic System Diagnosis and Repair
  26. 76.A vehicle's brake system requires DOT 5 brake fluid. A technician accidentally adds DOT 3 brake fluid to the reservoir. Which of the following is the most likely immediate consequence?Hydraulic System Diagnosis and Repair
  27. 77.A technician is preparing to install a new master cylinder. Before installation, they are performing a 'bench bleed' procedure. What is the PRIMARY purpose of bench bleeding the master cylinder?Hydraulic System Diagnosis and Repair
  28. 78.A technician is performing a brake system inspection and notices that the brake fluid reservoir cap is missing. The fluid level is low and appears dark. Which of the following is the most appropriate immediate action?Hydraulic System Diagnosis and Repair
  29. 79.A vehicle experiences a sudden, complete loss of braking in one hydraulic circuit (e.g., front brakes). The driver notices the brake pedal suddenly drops lower than usual, but they can still achieve some braking with increased pedal effort. Which component is specifically designed to alert the driver to this type of pressure differential and illuminate a warning light?Hydraulic System Diagnosis and Repair
  30. 80.A technician is diagnosing a vehicle with a spongy brake pedal. After performing a thorough visual inspection, they notice that the flexible brake hose leading to the right front caliper appears swollen and bulging. When the brake pedal is depressed, the bulge becomes more pronounced. Which of the following is the MOST likely symptom this hose is causing?Hydraulic System Diagnosis and Repair
  31. 81.A vehicle uses a dual-circuit master cylinder. If one hydraulic circuit fails due to a severe leak, what is the primary function of the quick take-up valve (or residual pressure valve in some designs) in the remaining good circuit?Hydraulic System Diagnosis and Repair
  32. 82.A technician is diagnosing a spongy brake pedal on a vehicle. After inspecting for external leaks and finding none, they decide to bleed the brakes. During the bleeding process, they notice that the bleeder screw on one caliper is loose and allows air to be drawn IN when the pedal is released. Which of the following is the MOST appropriate action?Hydraulic System Diagnosis and Repair
  33. 83.A client complains that their vehicle's brake pedal feels 'spongy' and requires multiple pumps to achieve adequate braking force. After inspecting for external leaks and finding none, a technician suspects air in the hydraulic system. Which of the following is the MOST effective method to remove air from the entire brake system, including the ABS Hydraulic Control Unit (HCU)?Hydraulic System Diagnosis and Repair
  34. 84.A technician is performing a pressure differential test on a dual-circuit master cylinder. After applying the brake pedal, the technician notices that the pressure in the primary circuit is 800 PSI, while the pressure in the secondary circuit is 600 PSI. What does this pressure difference MOST likely indicate?Hydraulic System Diagnosis and Repair
  35. 85.A technician is troubleshooting a brake system on a vehicle that uses DOT 5 brake fluid. The client reports a spongy pedal at times, especially after the vehicle has been sitting for a while, but it improves slightly after driving. The technician notices the fluid in the reservoir appears slightly cloudy. What is the MOST likely cause of this condition?Hydraulic System Diagnosis and Repair
  36. 86.A technician is performing a vacuum check on a brake booster. They pump the brake pedal several times with the engine off to deplete any residual vacuum, then hold the pedal down while starting the engine. What should happen to the brake pedal if the booster is functioning correctly?Hydraulic System Diagnosis and Repair
  37. 87.A technician is performing a diagnostic on a vehicle with an Anti-lock Braking System (ABS) that exhibits a 'hard pedal' symptom, but only when actively engaging ABS. The conventional braking feels normal. Which of the following components is MOST likely at fault?Hydraulic System Diagnosis and Repair
  38. 88.A client complains that their brake pedal feels 'soft' and spongy, requiring excessive travel before effective braking occurs. The technician inspects the system and finds no external leaks. The master cylinder reservoir is full. When the technician tries to manually bleed the system, very little fluid comes out of the bleeder screws, even with the pedal fully depressed. Which of the following is the MOST likely cause?Hydraulic System Diagnosis and Repair
  39. 89.A vehicle owner reports that their brake pedal feels 'hard' and requires excessive effort to stop the vehicle, particularly when first starting out. The master cylinder reservoir is full, and there are no visible leaks. What component is MOST likely at fault?Hydraulic System Diagnosis and Repair
  40. 90.A vehicle with an ABS warning light and a C0060 fault code (Left Front Wheel Speed Sensor Signal Incorrect) has been brought into the shop. Live data shows the left front wheel speed sensor outputting a consistent square wave signal at 15 Hz while the vehicle is stationary, but all other wheel speed sensors show 0 Hz. What is the MOST likely cause of this specific symptom?Anti-lock Brake System (ABS) Diagnosis and Repair
  41. 91.A customer complains that their vehicle's ABS warning light comes on intermittently, usually after driving through heavy rain or puddles. The scan tool reports various intermittent wheel speed sensor fault codes (e.g., C0031, C0034). Upon inspection, the technician finds no visible damage to the sensors or wiring, but notices signs of corrosion in one of the ABS control module's electrical connectors. What is the MOST likely root cause of these intermittent faults?Anti-lock Brake System (ABS) Diagnosis and Repair
  42. 92.A technician is diagnosing an ABS warning light and a C0121 fault code: 'Low System Voltage to ABS Control Module'. After verifying the battery voltage is 12.6V and the alternator is charging at 14.2V, the technician checks the ABS module's main power supply circuit. The voltage drop across the positive battery terminal to the ABS module's power input terminal (with the system active) should be no more than:Anti-lock Brake System (ABS) Diagnosis and Repair
  43. 93.A technician is performing a diagnostic procedure on an ABS system with a persistent C0110 fault code (Pump Motor Circuit Malfunction). After verifying power and ground to the ABS hydraulic control unit (HCU) and checking the continuity of the pump motor's internal windings, the technician suspects an issue with the pump motor relay. Where is the ABS pump motor relay MOST commonly integrated or located in modern ABS systems?Anti-lock Brake System (ABS) Diagnosis and Repair
  44. 94.During an ABS system bleeding procedure, a technician is using a scan tool to actuate the ABS pump motor and solenoid valves. Why is this step often necessary after replacing a component like the ABS hydraulic control unit?Anti-lock Brake System (ABS) Diagnosis and Repair
  45. 95.An ABS control module uses data from the wheel speed sensors to determine if a wheel is locking up. What is the approximate percentage of wheel slip that the ABS system typically tries to maintain during hard braking to achieve optimal stopping power?Anti-lock Brake System (ABS) Diagnosis and Repair
  46. 96.A technician is performing diagnostics on a vehicle with an intermittent ABS warning light. The scan tool reports a C0121 fault code, indicating a 'Valve Relay Circuit Malfunction'. What is the most likely location of the component associated with this fault code?Anti-lock Brake System (ABS) Diagnosis and Repair
  47. 97.A technician is evaluating an ABS control module that is suspected of internal failure. Which of the following diagnostic methods is generally NOT recommended or feasible for testing the internal components of a modern ABS control module?Anti-lock Brake System (ABS) Diagnosis and Repair
  48. 98.A technician is diagnosing an intermittent ABS warning light on a vehicle. The scan tool shows a C0035 fault code for the right front wheel speed sensor. Live data shows the right front wheel speed sensor reading 0 MPH while the vehicle is moving at 15 MPH. All other wheel speed sensors are reading correctly. Which of the following is the MOST likely cause of this issue?Anti-lock Brake System (ABS) Diagnosis and Repair
  49. 99.A customer complains that their vehicle's brake pedal occasionally feels 'spongy' at low speeds, but the problem disappears at higher speeds. The ABS warning light is NOT illuminated, and there are no stored fault codes. Which of the following is the MOST likely cause?Anti-lock Brake System (ABS) Diagnosis and Repair
  50. 100.A vehicle equipped with Electronic Stability Control (ESC) is experiencing an intermittent ESC warning light and a C1290 fault code: 'Brake Pressure Sensor Circuit'. The technician suspects the brake pressure sensor is faulty. Which of the following statements about the brake pressure sensor is TRUE?Anti-lock Brake System (ABS) Diagnosis and Repair