Free ASE Automobile & Light Truck Brakes (A5) Certification Test Practice Questions

Sample Practice Questions

Try these 10 sample questions from the ASE Automobile & Light Truck Brakes (A5) Certification Test practice bank. Each includes the answer and explanation. Continue with the interactive practice above to review the full question set.

1. 1A technician plugs both master-cylinder outlet ports and applies steady pedal pressure. The pedal height still cannot be maintained. What does this result indicate?

   1. A. An internal leak in the master cylinder
   2. B. A restriction in a wheel brake hose
   3. C. Air trapped in a wheel cylinder
   4. D. Excessive clearance at a brake shoe

   Answer: A

   Explanation: "If brake pedal height cannot be maintained, the master cylinder has an internal leak and must be rebuilt or a new one installed." With the outlets plugged, the falling pedal identifies internal leakage in the cylinder itself; the wheel-end alternatives are isolated.

   Reference: TH!NK neighbor Section 2 Chassis — p. 7, Master Cylinder

2. 2For the drum-brake design in Bosch's procedure, what preparatory parking-brake action is directed before disassembly?

   1. A. Partly loosen the cables but keep lever tension
   2. B. Leave the existing cable adjustment untouched
   3. C. Tighten the cables until both shoes contact the drum
   4. D. Loosen the cables as far as possible at the adjustment unit

   Answer: D

   Explanation: "Loosen the parking brake cables as far as possible using the adjustment unit" gives the preparatory state. Partial release, no change, or tightening do not reach that state.

   Reference: Bosch Drum Brakes: Tips, Tests and Repair Information — p. 2, Preparatory measures

3. 3While a disc brake caliper is removed for pad service, how should it be supported?

   1. A. Rest it on the rotor so the hose remains straight.
   2. B. Suspend it so the brake hose carries no tensile load.
   3. C. Leave it attached to the brake hose while the bracket is cleaned.
   4. D. Clamp the hose to hold the caliper at work height.

   Answer: B

   Explanation: "Suspend brake caliper so that no tensile forces act on the brake hose" Supporting the caliper independently prevents its weight from loading the flexible hose.

   Reference: Bosch Disc Brake: Tips, Tests and Repair Information — p. 3, Disassembly, step 3

4. 4In the 2026 Sierra electronic brake system, which unit controls ABS functions and detects failures?

   1. A. Instrument cluster.
   2. B. Electronic brake control module.
   3. C. Brake pedal position sensor.
   4. D. Brake pressure modulator.

   Answer: B

   Explanation: "The electronic brake control module controls the system functions and detects failures." The module is the control and fault-detection unit; the modulator contains hydraulic devices.

   Reference: 2026 Sierra 2500/3500HD Electrical Body Builder Manual — p. 2-6, ABS Description and Operation, components

5. 5What is the master cylinder's primary function in a hydraulic brake system?

   1. A. Convert wheel-circuit pressure into pedal force
   2. B. Convert mechanical input force into hydraulic pressure
   3. C. Reduce hydraulic pressure in rear wheel circuits
   4. D. Convert hydraulic pressure into shoe or pad force

   Answer: B

   Explanation: "Hydraulic Brake Master Cylinder: Converts mechanical input force into hydraulic output pressure." The master cylinder creates pressure from pedal input; pressure regulation and wheel-end force conversion occur elsewhere.

   Reference: 2026 Sierra 2500/3500HD Electrical Body Builder Manual — p. 2-17, Hydraulic Brake System Description and Operation

6. 6A brake drum is tight on the wheel hub in Bosch's general service procedure. Which removal method is specified?

   1. A. Use a light tap to release a tight drum from the hub
   2. B. Use heavy blows directly on the wheel-hub flange
   3. C. Pry the drum off against the brake-shoe lining
   4. D. Heat the hub to break the drum-to-hub contact

   Answer: A

   Explanation: "If required, loosen any tight brake drum on the wheel hub with a light tap" specifies controlled light impact. Heavy hub blows, shoe prying, and heat are different and risk component damage.

   Reference: Bosch Drum Brakes: Tips, Tests and Repair Information — p. 2, Disassembly step 3

7. 7Which instrument and contact location does Bosch specify to measure brake disc lateral runout?

   1. A. A depth gauge across the pad backing plate.
   2. B. An outside micrometer at eight equally spaced points.
   3. C. A dial gauge against the disc friction surface near its outer edge.
   4. D. A dial gauge against the wheel hub end face near its center.

   Answer: C

   Explanation: "Adjust magnetic base so that the dial gauge stylus makes contact approx. 10 – 15 mm from the outer edge on the friction surface" The dial gauge contacts the disc face near the outside edge; the micrometer procedure measures thickness, and hub-face measurement tests a different component.

   Reference: Bosch Disc Brake: Tips, Tests and Repair Information — p. 4, Checking brake disc (lateral runout), step 5

8. 8What does the four-circuit brake pressure modulator allow the 2026 Sierra electronic brake system to control independently?

   1. A. Only master-cylinder reservoir pressure.
   2. B. Steering angle at each front wheel.
   3. C. Pressure to each wheel.
   4. D. Only pressure to the rear axle as a pair.

   Answer: C

   Explanation: "uses a four circuit configuration to control hydraulic pressure to each wheel independently." The four circuits support individual-wheel hydraulic control.

   Reference: 2026 Sierra 2500/3500HD Electrical Body Builder Manual — p. 2-6, ABS Description and Operation

9. 9In the described dual-circuit hydraulic system, how does the master cylinder distribute its hydraulic output?

   1. A. Only to the rear pressure-control circuit
   2. B. Through one circuit shared by every wheel
   3. C. Through two opposed wheel-apply circuits
   4. D. Directly to each caliper without brake pipes

   Answer: C

   Explanation: "Hydraulic output pressure is distributed from the master cylinder through 2 hydraulic circuits, supplying front-rear opposed wheel apply circuits." This is the stated circuit arrangement for the described system, not a claim about every vehicle design.

   Reference: 2026 Sierra 2500/3500HD Electrical Body Builder Manual — p. 2-17, Hydraulic Brake System Description and Operation

10. 10Which tool does Bosch specify for dismantling the drum-brake shoe holding spring plate?

    1. A. A flat-blade screwdriver
    2. B. A dedicated spring-plate service tool
    3. C. A standard brake spring hook
    4. D. General-purpose locking pliers

    Answer: B

    Explanation: "Dismantle the brake shoe holding spring plate using the special tool" identifies the dedicated tool. The other real shop tools might be used for neighboring work but are not the specified spring-plate tool.

    Reference: Bosch Drum Brakes: Tips, Tests and Repair Information — p. 2, Disassembly step 4