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Automobile & Light Truck Certification Test A5 Brakes practice questions

216 free questions with answers and explanations.

Practice test
  1. 101.A technician is diagnosing an ABS warning light on a vehicle. The scan tool reports a C0035 fault code: 'Left Front Wheel Speed Sensor Circuit Range/Performance'. Live data shows the left front wheel speed sensor signal fluctuating erratically at low speeds and dropping to zero intermittently, while other wheel speed sensors show consistent readings. What is the MOST likely cause of this issue?Anti-lock Brake System (ABS) Diagnosis and Repair
  2. 102.A vehicle's ABS system uses a magnetic wheel speed sensor (passive type) and a toothed tone ring. If the air gap between the sensor and the tone ring is excessively large, what effect will this MOST likely have on the sensor's signal?Anti-lock Brake System (ABS) Diagnosis and Repair
  3. 103.A technician is diagnosing an ABS warning light on a vehicle that also exhibits a 'hard' brake pedal and extended stopping distances, particularly during sudden stops. The scan tool shows no specific ABS fault codes, but the brake booster vacuum line and check valve have been confirmed to be in good condition. What ABS-related system component should the technician investigate NEXT?Anti-lock Brake System (ABS) Diagnosis and Repair
  4. 104.A vehicle's ABS warning light is on, and the scan tool indicates a C0050 fault code for 'Left Rear Wheel Speed Sensor Supply Voltage'. A multimeter test at the sensor connector shows 0 volts on the supply wire with the ignition on. All other wheel speed sensors are functioning correctly. Which of the following is the MOST appropriate next diagnostic step?Anti-lock Brake System (ABS) Diagnosis and Repair
  5. 105.A vehicle equipped with stability control exhibits an ABS warning light and a C1288 fault code, indicating 'Pressure Sensor Circuit Malfunction'. Where is this pressure sensor typically located within the ABS/ESC system?Anti-lock Brake System (ABS) Diagnosis and Repair
  6. 106.A vehicle with traction control (TCS) experiences wheel spin on a slippery surface. To restore traction, the TCS system applies the brake to the spinning wheel. Which of the following components is DIRECTLY responsible for precisely modulating the hydraulic pressure to that specific wheel's brake caliper?Anti-lock Brake System (ABS) Diagnosis and Repair
  7. 107.A technician is diagnosing an ABS warning light and a C0070 fault code: 'Steering Angle Sensor (SAS) Circuit'. The vehicle also has an intermittently working stability control (ESC) system. The SAS is a critical input for the ESC system. What information does the SAS primarily provide to the ABS/ESC control module?Anti-lock Brake System (ABS) Diagnosis and Repair
  8. 108.A technician is performing a post-repair road test on a vehicle after replacing a faulty ABS wheel speed sensor. The ABS warning light is off, but during a controlled stop, the technician notices that the brake pedal pulsates excessively and inconsistently, indicating that the ABS is activating prematurely or erratically. There are no current fault codes. What is the MOST likely cause?Anti-lock Brake System (ABS) Diagnosis and Repair
  9. 109.A vehicle with electronic stability control (ESC) begins to oversteer during a turn. Which of the following is the MOST likely action the ESC system will take to correct this condition?Anti-lock Brake System (ABS) Diagnosis and Repair
  10. 110.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
  11. 111.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
  12. 112.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
  13. 113.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
  14. 114.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
  15. 115.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
  16. 116.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
  17. 117.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
  18. 118.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
  19. 119.A vehicle's parking brake does not hold the vehicle on an incline, and the parking brake lever feels loose with excessive travel. The technician confirms that the parking brake cables are not seized and the internal drum brake components appear to be in good condition. What is the MOST likely cause of this issue?Drum Brake Diagnosis and Repair
  20. 120.A client reports that their vehicle's parking brake does not hold the vehicle effectively on an incline. A technician inspects the rear drum brakes and finds that the parking brake levers on both sides are seized in the 'off' position. After freeing the levers, what is the NEXT step the technician should take?Drum Brake Diagnosis and Repair
  21. 121.A vehicle with drum brakes pulls sharply to one side when the brakes are applied. Upon inspection, the technician finds that the brake drum on the pulling side is significantly hotter than the drum on the opposite side. What is the most likely cause?Drum Brake Diagnosis and Repair
  22. 122.A technician is performing a drum brake service. After removing the drum, they notice that the primary brake shoe has significantly less friction material remaining than the secondary brake shoe. What is the most probable cause of this uneven wear?Drum Brake Diagnosis and Repair
  23. 123.A technician is inspecting a drum brake system. Upon removal of the drum, they notice significant scoring and heat checking on the drum's friction surface. Which of the following is the MOST appropriate next step?Drum Brake Diagnosis and Repair
  24. 124.Which of the following is the PRIMARY function of the anchor pin in a drum brake assembly?Drum Brake Diagnosis and Repair
  25. 125.A technician is replacing drum brake shoes. They notice that the wheel cylinder bores are slightly pitted but not leaking. Technician A states that the wheel cylinder should be replaced. Technician B states that the wheel cylinder can be honed to remove the pitting, provided the bore isn't excessively oversized. Who is correct?Drum Brake Diagnosis and Repair
  26. 126.When replacing drum brake shoes, technician A states that the primary shoe is typically shorter than the secondary shoe and faces the front of the vehicle. Technician B states that the primary shoe has less lining material and is positioned towards the front of the vehicle. Who is correct?Drum Brake Diagnosis and Repair
  27. 127.A technician is inspecting a rear drum brake assembly. They notice that the brake shoes are glazed and hardened, and the drum shows signs of minor heat spots and discoloration. The customer reports a 'grabby' or 'hard' brake pedal. What is the MOST likely cause of these symptoms?Drum Brake Diagnosis and Repair
  28. 128.A customer complains that their vehicle pulls to the left when the brakes are applied. During inspection, the right rear drum brake assembly is found to have a greasy, fluid-soaked brake shoe. The left rear brake appears normal. What is the MOST likely cause of the pull?Drum Brake Diagnosis and Repair
  29. 129.A technician is diagnosing a drum brake system where the parking brake lever requires excessive pulling and the rear brakes show poor holding power when the parking brake is engaged. They verify the parking brake cable is not seized. What is the MOST likely cause of this condition?Drum Brake Diagnosis and Repair
  30. 130.A technician is performing a pre-inspection of a drum brake system. They notice that the brake drum has an excessive amount of rust and corrosion on its inner friction surface, making it rough. What is the most appropriate action to take?Drum Brake Diagnosis and Repair
  31. 131.A technician is performing a pre-inspection of a drum brake assembly. They notice a small amount of brake fluid seeping from the boot of the wheel cylinder. The brake pedal feels slightly low but firm. Which of the following is the MOST appropriate action?Drum Brake Diagnosis and Repair
  32. 132.A technician is performing a rear drum brake adjustment. The vehicle has non-self-adjusting drum brakes. After replacing the shoes, the technician needs to set the initial shoe-to-drum clearance. The manufacturer specifies a clearance of 0.006 inches. Which of the following tools is BEST suited for accurately measuring this small clearance?Drum Brake Diagnosis and Repair
  33. 133.A technician is inspecting a drum brake assembly. They notice that the brake drum has several hairline cracks radiating from the hub area. What is the MOST appropriate action for the technician to take?Drum Brake Diagnosis and Repair
  34. 134.During a brake inspection, a technician finds that one of the rear drum brake shoes is severely worn on the top edge, while the bottom edge shows minimal wear. The opposite shoe in the same wheel assembly shows normal, even wear. Which of the following is the MOST likely cause?Drum Brake Diagnosis and Repair
  35. 135.A technician is performing a pre-inspection of a drum brake system. They notice a significant amount of black, greasy residue on the inside of the brake drum and on the brake shoes. The drum itself appears to be slightly scored. What is the MOST likely source of this contamination?Drum Brake Diagnosis and Repair
  36. 136.During a drum brake service, a technician notes that the brake shoes are contaminated with axle grease. Which of the following is the most likely source of this contamination?Drum Brake Diagnosis and Repair
  37. 137.A customer reports that their vehicle's rear brakes make a loud grinding noise when applied. Upon inspection, a technician finds deep scoring marks on the inside surface of the brake drum. What is the most probable cause of this condition?Drum Brake Diagnosis and Repair
  38. 138.A technician is performing a rear drum brake service. After replacing the shoes and inspecting the wheel cylinders, they find that the automatic adjusters are rusted and seized. What is the MOST critical reason to replace these adjusters?Drum Brake Diagnosis and Repair
  39. 139.A technician is inspecting the wheel cylinders on a drum brake system. They notice that the rubber boots covering the ends of the wheel cylinders are torn and cracked, but there are no visible signs of brake fluid leakage. What is the MOST important reason to replace these wheel cylinders, even without a current leak?Drum Brake Diagnosis and Repair
  40. 140.When reassembling a drum brake system, a technician applies a thin layer of high-temperature grease to the contact points between the brake shoes and the backing plate. What is the PRIMARY reason for this practice?Drum Brake Diagnosis and Repair
  41. 141.When measuring a brake drum, a technician uses a brake drum micrometer. They measure the drum diameter at several points and find the measurement to be 10.030 inches. The drum is stamped with a nominal diameter of 10.000 inches and a maximum allowable diameter of 10.060 inches. What should the technician do?Drum Brake Diagnosis and Repair
  42. 142.A customer complains of a grinding noise and reduced braking effectiveness from the rear wheels. Upon inspection, a technician finds severe grooves and scoring on the inner surface of the brake drums. What is the MOST likely cause of this condition?Drum Brake Diagnosis and Repair
  43. 143.A technician is performing a pre-inspection of a drum brake system. They notice significant rust and corrosion on the brake drum's friction surface, but no deep scoring or cracking. The drum measures well within its maximum diameter specification. What is the MOST appropriate action to take?Drum Brake Diagnosis and Repair
  44. 144.A technician is performing a drum brake inspection and finds that the brake drum has a 'hard spot' or 'hot spot' indicated by a localized discolored area that is harder than the surrounding metal. What is the MOST effective way to address this condition?Drum Brake Diagnosis and Repair
  45. 145.A vehicle with drum brakes on the rear experiences a severe pull to one side when the brakes are applied. Upon inspection, the technician finds that the primary brake shoe on the pulling side is heavily glazed and appears overheated, while the secondary shoe on the same wheel appears normal. The wheel cylinder is not leaking. What is the MOST likely cause of this condition?Drum Brake Diagnosis and Repair
  46. 146.A technician is performing a drum brake service on a vehicle. After removing the drum, they notice that the friction material on the primary shoe is significantly thinner than the friction material on the secondary shoe. What is the MOST likely reason for this condition?Drum Brake Diagnosis and Repair
  47. 147.A vehicle owner complains that their parking brake does not hold the vehicle on a slight incline, even when fully engaged. A technician inspects the rear drum brakes and finds that the parking brake levers on both sides are seized in the 'off' position. What is the MOST appropriate diagnostic step to take next?Drum Brake Diagnosis and Repair
  48. 148.A vehicle exhibits a 'spongy' brake pedal and requires excessive travel to achieve braking in a drum brake system. The brake shoes are new, and the drums are within specification. Which of the following components is the MOST likely cause of this symptom?Drum Brake Diagnosis and Repair
  49. 149.A technician is inspecting a drum brake assembly. They notice that the automatic adjuster lever is bent and not properly engaging the star wheel. What is the MOST likely consequence of this issue?Drum Brake Diagnosis and Repair
  50. 150.A technician is replacing the brake shoes on a drum brake system. They notice that the hold-down springs are severely corroded and have lost much of their tension. What problem could this condition lead to if not corrected?Drum Brake Diagnosis and Repair