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Automobile & Light Truck Certification Test A5 Brakes practice questions

216 free questions with answers and explanations.

Practice test
  1. 201.A technician is diagnosing a vehicle with a spongy brake pedal that gradually firms up after several rapid pumps. After checking for external leaks and bleeding the system conventionally with no improvement, the technician suspects a specific issue within the master cylinder. Which of the following is the MOST likely cause?Hydraulic System Diagnosis and Repair
  2. 202.A technician is installing a new section of steel brake line. After double flaring the end, they notice that the flare appears uneven and slightly off-center. What is the MOST likely consequence of installing this uneven flare?Hydraulic System Diagnosis and Repair
  3. 203.A technician is inspecting a drum brake assembly. They notice that the wheel cylinder's rubber boots are cracked and torn, but there are no visible signs of fluid leakage around the boots. What is the MOST critical immediate concern?Drum Brake Diagnosis and Repair
  4. 204.A vehicle with a dual-circuit master cylinder experiences a sudden, complete loss of braking in the front circuit. What is the primary function of the pressure differential valve in this scenario?Hydraulic System Diagnosis and Repair
  5. 205.A vehicle with traction control (TCS) experiences wheel spin on a slippery surface. To regain traction, the TCS activates. Which component within the ABS hydraulic control unit (HCU) is primarily responsible for reducing brake fluid pressure to the spinning wheel?Anti-lock Brake System (ABS) Diagnosis and Repair
  6. 206.A technician is diagnosing a drum brake system where the parking brake lever moves through its full travel without engaging the brakes effectively. What is the MOST likely cause?Drum Brake Diagnosis and Repair
  7. 207.A technician is evaluating a vehicle with a complaint of a 'hard pedal' that requires excessive effort to stop. They connect a vacuum gauge to the brake booster vacuum line and read 18 in. Hg with the engine running at idle. After shutting off the engine, the vacuum gauge reading drops to 0 in. Hg within 30 seconds. What does this test indicate?Hydraulic System Diagnosis and Repair
  8. 208.A technician is bleeding a hydraulic brake system. They notice that after repeated pedal presses, the fluid coming out of the bleeder screw still contains small, consistent air bubbles. The bleeder screw is tightened properly, and the fluid reservoir is kept full. What is the MOST likely reason for the persistent air bubbles?Hydraulic System Diagnosis and Repair
  9. 209.A technician is performing a brake fluid flush on a vehicle. They notice that the new brake fluid being added from the bottle is slightly cloudy or milky in appearance. What is the MOST likely cause of this abnormal appearance?Hydraulic System Diagnosis and Repair
  10. 210.A technician is replacing brake shoes on a drum brake system. What is the primary purpose of applying a thin layer of high-temperature grease to the shoe contact points on the backing plate?Drum Brake Diagnosis and Repair
  11. 211.A vehicle with an Anti-lock Braking System (ABS) has a spongy brake pedal that improves slightly after multiple pumps. A technician suspects trapped air within the ABS Hydraulic Control Unit (HCU). What is the MOST appropriate next step for the technician to take?Hydraulic System Diagnosis and Repair
  12. 212.A customer reports that their vehicle's parking brake does not hold the vehicle effectively on an incline, and the parking brake lever requires excessive travel to engage. The rear drum brakes were recently serviced, including shoe replacement and adjuster adjustment. What is the MOST likely cause of this continued issue?Drum Brake Diagnosis and Repair
  13. 213.A customer complains that their vehicle's brake pedal occasionally feels 'spongy' at low speeds, and the ABS warning light illuminates intermittently. A scan tool shows no active fault codes, but historical codes indicate 'C1210 - System Voltage Low'. Further testing reveals normal battery voltage and charging system operation. Which of the following is the MOST likely cause of the intermittent sponginess and voltage code?Anti-lock Brake System (ABS) Diagnosis and Repair
  14. 214.A technician is diagnosing an ABS warning light on a vehicle that uses an integral ABS design (pump and control module combined). The scan tool indicates a C0110 fault code: 'Pump Motor Circuit Malfunction'. Which of the following components is MOST likely to be the source of this fault if all wiring and power/ground supplies to the ABS module test good?Anti-lock Brake System (ABS) Diagnosis and Repair
  15. 215.A client complains that their brake pedal is firm and high but requires excessive force to stop the vehicle. The technician confirms good brake pad and rotor condition, and the master cylinder is not leaking. What is the MOST likely cause of this symptom?Hydraulic System Diagnosis and Repair
  16. 216.A technician is diagnosing a vehicle with a vacuum-assist brake booster. The customer reports that the brake pedal is hard to push after the engine has been turned off for an hour, but feels normal when the engine is running. Which of the following is the most likely cause?Power Assist Unit Diagnosis and Repair