MICHIGAN STATE BRAKES
CERTIFICATION EXAM QUESTIONS
WITH VERIFIED ANSWERS
1. What is the primary function of a proportioning valve in a hydraulic brake system?
A. To increase total fluid pressure during emergency stops
B. To prevent the brake pedal from sinking under prolonged pressure
C. To release trapped air from the master cylinder
D. To balance the pressure between the front disc and rear drum brakes
Answer: D
Conceptual Explanation: A proportioning valve limits hydraulic pressure to the rear
brakes during heavy braking to prevent rear wheel lock-up.
2. Which of the following is a characteristic symptom of warped brake rotors?
A. Spongy brake pedal feel
B. A continuous high-pitched squeal while driving straight
C. Brake pedal pulsation and steering wheel vibration during braking
D. Total loss of brake fluid with no pedal resistance
,Answer: C
Conceptual Explanation: Warped rotors cause thickness variation, which pushes the
brake pads back and results in pedal pulsation and steering wheel vibration.
3. What type of fluid is standard for most modern automotive brake systems?
A. Multi-grade engine oil
B. Petroleum-based hydraulic oil
C. Silicone-based ATF fluid
D. DOT 3 or DOT 4 glycol-based fluid
Answer: D
Conceptual Explanation: Most modern vehicles use DOT 3, DOT 4, or DOT 5.1 glycol-
based brake fluids due to their high boiling points.
4. What is the purpose of the low vacuum check valve in a vacuum power brake booster?
A. To increase engine idle speed when brakes are applied
B. To trap vacuum in the booster in case of engine vacuum loss
C. To vent excess brake fluid back to the reservoir
D. To measure the pressure differential across the diaphragm
Answer: B
, Conceptual Explanation: The check valve maintains a vacuum reserve inside the booster
so power-assisted braking is available even if the engine stalls.
5. When servicing drum brakes, what component is used to automatically adjust the
clearance as the linings wear?
A. Metering valve
B. Return spring assembly
C. Residual pressure valve
D. Star wheel adjuster mechanism
Answer: D
Conceptual Explanation: The star wheel adjuster and its associated lever mechanism
expand the shoes closer to the drum as the friction material wears down.
6. Which tool is specifically required to retract a rear caliper piston that incorporates an
internal parking brake mechanism?
A. A standard C-clamp
B. A caliper piston rewinding tool
C. A tapered brass punch
D. An impact wrench
Answer: B
CERTIFICATION EXAM QUESTIONS
WITH VERIFIED ANSWERS
1. What is the primary function of a proportioning valve in a hydraulic brake system?
A. To increase total fluid pressure during emergency stops
B. To prevent the brake pedal from sinking under prolonged pressure
C. To release trapped air from the master cylinder
D. To balance the pressure between the front disc and rear drum brakes
Answer: D
Conceptual Explanation: A proportioning valve limits hydraulic pressure to the rear
brakes during heavy braking to prevent rear wheel lock-up.
2. Which of the following is a characteristic symptom of warped brake rotors?
A. Spongy brake pedal feel
B. A continuous high-pitched squeal while driving straight
C. Brake pedal pulsation and steering wheel vibration during braking
D. Total loss of brake fluid with no pedal resistance
,Answer: C
Conceptual Explanation: Warped rotors cause thickness variation, which pushes the
brake pads back and results in pedal pulsation and steering wheel vibration.
3. What type of fluid is standard for most modern automotive brake systems?
A. Multi-grade engine oil
B. Petroleum-based hydraulic oil
C. Silicone-based ATF fluid
D. DOT 3 or DOT 4 glycol-based fluid
Answer: D
Conceptual Explanation: Most modern vehicles use DOT 3, DOT 4, or DOT 5.1 glycol-
based brake fluids due to their high boiling points.
4. What is the purpose of the low vacuum check valve in a vacuum power brake booster?
A. To increase engine idle speed when brakes are applied
B. To trap vacuum in the booster in case of engine vacuum loss
C. To vent excess brake fluid back to the reservoir
D. To measure the pressure differential across the diaphragm
Answer: B
, Conceptual Explanation: The check valve maintains a vacuum reserve inside the booster
so power-assisted braking is available even if the engine stalls.
5. When servicing drum brakes, what component is used to automatically adjust the
clearance as the linings wear?
A. Metering valve
B. Return spring assembly
C. Residual pressure valve
D. Star wheel adjuster mechanism
Answer: D
Conceptual Explanation: The star wheel adjuster and its associated lever mechanism
expand the shoes closer to the drum as the friction material wears down.
6. Which tool is specifically required to retract a rear caliper piston that incorporates an
internal parking brake mechanism?
A. A standard C-clamp
B. A caliper piston rewinding tool
C. A tapered brass punch
D. An impact wrench
Answer: B
