MICHIGAN STATE BRAKES
CERTIFICATION EXAM QUESTIONS
WITH VERIFIED ANSWERS
1. What is the primary purpose of a dual-reservoir master cylinder in a hydraulic brake
system?
A. To increase overall braking pressure by 50 percent
B. To eliminate the need for a vacuum booster
C. To allow the use of both DOT 3 and DOT 5 brake fluid simultaneously
D. To provide separate hydraulic circuits for front and rear or diagonally split brakes
Answer: D
Conceptual Explanation: A dual-reservoir master cylinder separates the hydraulic system
into two independent circuits to ensure that if one circuit fails, the other can still provide
some braking capability.
2. Which type of brake fluid is silicone-based and does not mix with water?
A. DOT 5
B. DOT 4
C. DOT 3
,D. DOT 5.1
Answer: A
Conceptual Explanation: DOT 5 is a silicone-based brake fluid that is hydrophobic (does
not absorb water), whereas DOT 3, 4, and 5.1 are glycol-based and hygroscopic.
3. What is the main function of a proportioning valve in a disc/drum brake system?
A. To activate the brake warning light if fluid levels drop
B. To increase fluid pressure to the front calipers during emergency stops
C. To prevent rear wheel lock-up by limiting hydraulic pressure to the rear brakes during
hard stops
D. To bleed air automatically from the rear wheel cylinders
Answer: C
Conceptual Explanation: Proportioning valves restrict pressure to the rear drum brakes
during heavy braking to prevent the rear wheels from locking up as weight transfers to the
front.
4. When inspecting a brake rotor, which tool is used to measure parallelism and thickness
variation?
A. Dial indicator
B. Feeler gauge
C. Vernier caliper
, D. Outside micrometer
Answer: D
Conceptual Explanation: An outside micrometer is used to measure the thickness of a
brake rotor at multiple points around its circumference to check for thickness variation
and parallelism.
5. What causes brake pedal fade during repeated hard braking?
A. Boiling of moisture in the brake fluid creating compressible vapor pockets
B. Excessive vacuum in the intake manifold
C. Sticking parking brake cable
D. Worn out wheel bearings
Answer: A
Conceptual Explanation: Brake fade is often caused by vapor lock, which occurs when
extreme heat causes moisture within the brake fluid to boil, creating compressible gas
bubbles that cause a spongy or sinking pedal.
6. Which component in an anti-lock braking system (ABS) monitors wheel speed?
A. Wheel speed sensor
B. Hydraulic modulator
C. EBCM relay
D. Accumulator
CERTIFICATION EXAM QUESTIONS
WITH VERIFIED ANSWERS
1. What is the primary purpose of a dual-reservoir master cylinder in a hydraulic brake
system?
A. To increase overall braking pressure by 50 percent
B. To eliminate the need for a vacuum booster
C. To allow the use of both DOT 3 and DOT 5 brake fluid simultaneously
D. To provide separate hydraulic circuits for front and rear or diagonally split brakes
Answer: D
Conceptual Explanation: A dual-reservoir master cylinder separates the hydraulic system
into two independent circuits to ensure that if one circuit fails, the other can still provide
some braking capability.
2. Which type of brake fluid is silicone-based and does not mix with water?
A. DOT 5
B. DOT 4
C. DOT 3
,D. DOT 5.1
Answer: A
Conceptual Explanation: DOT 5 is a silicone-based brake fluid that is hydrophobic (does
not absorb water), whereas DOT 3, 4, and 5.1 are glycol-based and hygroscopic.
3. What is the main function of a proportioning valve in a disc/drum brake system?
A. To activate the brake warning light if fluid levels drop
B. To increase fluid pressure to the front calipers during emergency stops
C. To prevent rear wheel lock-up by limiting hydraulic pressure to the rear brakes during
hard stops
D. To bleed air automatically from the rear wheel cylinders
Answer: C
Conceptual Explanation: Proportioning valves restrict pressure to the rear drum brakes
during heavy braking to prevent the rear wheels from locking up as weight transfers to the
front.
4. When inspecting a brake rotor, which tool is used to measure parallelism and thickness
variation?
A. Dial indicator
B. Feeler gauge
C. Vernier caliper
, D. Outside micrometer
Answer: D
Conceptual Explanation: An outside micrometer is used to measure the thickness of a
brake rotor at multiple points around its circumference to check for thickness variation
and parallelism.
5. What causes brake pedal fade during repeated hard braking?
A. Boiling of moisture in the brake fluid creating compressible vapor pockets
B. Excessive vacuum in the intake manifold
C. Sticking parking brake cable
D. Worn out wheel bearings
Answer: A
Conceptual Explanation: Brake fade is often caused by vapor lock, which occurs when
extreme heat causes moisture within the brake fluid to boil, creating compressible gas
bubbles that cause a spongy or sinking pedal.
6. Which component in an anti-lock braking system (ABS) monitors wheel speed?
A. Wheel speed sensor
B. Hydraulic modulator
C. EBCM relay
D. Accumulator
