ASE T4 BRAKES EXAM QUESTION AND
CORRECT ANSWERS (VERIFIED
ANSWERS) PLUS RATIONALES 2026 Q&A
INSTANT DOWNLOAD PDF
1. A driver complains that the brake pedal feels spongy. What is the most
likely cause?
A. Worn brake pads
B. Air in the hydraulic system
C. Warped brake rotors
D. Faulty proportioning valve
Answer: B
Rationale: A spongy pedal is commonly caused by compressible air trapped in
the hydraulic brake system.
2. What component converts hydraulic pressure into mechanical force at the
wheels?
A. Master cylinder
B. Brake booster
C. Caliper or wheel cylinder
D. Proportioning valve
Answer: C
Rationale: Calipers (disc brakes) and wheel cylinders (drum brakes) apply force
to the friction material using hydraulic pressure.
3. Excessive brake pedal travel on a hydraulic brake system is often caused by:
A. Low tire pressure
, B. Air in the brake lines
C. Overheated brake fluid
D. Faulty ABS module
Answer: B
Rationale: Air compresses under pressure, causing excessive pedal travel.
4. What is the primary function of a brake booster?
A. Increase brake fluid pressure
B. Reduce pedal effort
C. Control front-to-rear braking
D. Prevent wheel lockup
Answer: B
Rationale: The brake booster assists the driver by reducing the effort required to
apply the brakes.
5. Which brake fluid type is silicone-based?
A. DOT 3
B. DOT 4
C. DOT 5
D. DOT 5.1
Answer: C
Rationale: DOT 5 brake fluid is silicone-based and is not hygroscopic.
6. Brake pull during stopping is most commonly caused by:
A. Unequal brake adjustment
B. Faulty ABS sensor
C. Low master cylinder fluid
D. Brake booster failure
, Answer: A
Rationale: Unequal braking force side-to-side causes the vehicle to pull during
braking.
7. What condition can cause brake fade?
A. Cold brake components
B. Overheated friction material
C. Low vacuum supply
D. Excessive brake fluid level
Answer: B
Rationale: Brake fade occurs when excessive heat reduces friction between the
brake components.
8. Which tool is commonly used to measure brake rotor thickness?
A. Dial indicator
B. Feeler gauge
C. Micrometer
D. Vacuum gauge
Answer: C
Rationale: A micrometer provides accurate measurement of rotor thickness.
9. A pulsating brake pedal during stops usually indicates:
A. Air in the system
B. Warped rotors
C. Low brake fluid
D. Faulty booster
Answer: B
Rationale: Rotor thickness variation or warping causes pedal pulsation.
CORRECT ANSWERS (VERIFIED
ANSWERS) PLUS RATIONALES 2026 Q&A
INSTANT DOWNLOAD PDF
1. A driver complains that the brake pedal feels spongy. What is the most
likely cause?
A. Worn brake pads
B. Air in the hydraulic system
C. Warped brake rotors
D. Faulty proportioning valve
Answer: B
Rationale: A spongy pedal is commonly caused by compressible air trapped in
the hydraulic brake system.
2. What component converts hydraulic pressure into mechanical force at the
wheels?
A. Master cylinder
B. Brake booster
C. Caliper or wheel cylinder
D. Proportioning valve
Answer: C
Rationale: Calipers (disc brakes) and wheel cylinders (drum brakes) apply force
to the friction material using hydraulic pressure.
3. Excessive brake pedal travel on a hydraulic brake system is often caused by:
A. Low tire pressure
, B. Air in the brake lines
C. Overheated brake fluid
D. Faulty ABS module
Answer: B
Rationale: Air compresses under pressure, causing excessive pedal travel.
4. What is the primary function of a brake booster?
A. Increase brake fluid pressure
B. Reduce pedal effort
C. Control front-to-rear braking
D. Prevent wheel lockup
Answer: B
Rationale: The brake booster assists the driver by reducing the effort required to
apply the brakes.
5. Which brake fluid type is silicone-based?
A. DOT 3
B. DOT 4
C. DOT 5
D. DOT 5.1
Answer: C
Rationale: DOT 5 brake fluid is silicone-based and is not hygroscopic.
6. Brake pull during stopping is most commonly caused by:
A. Unequal brake adjustment
B. Faulty ABS sensor
C. Low master cylinder fluid
D. Brake booster failure
, Answer: A
Rationale: Unequal braking force side-to-side causes the vehicle to pull during
braking.
7. What condition can cause brake fade?
A. Cold brake components
B. Overheated friction material
C. Low vacuum supply
D. Excessive brake fluid level
Answer: B
Rationale: Brake fade occurs when excessive heat reduces friction between the
brake components.
8. Which tool is commonly used to measure brake rotor thickness?
A. Dial indicator
B. Feeler gauge
C. Micrometer
D. Vacuum gauge
Answer: C
Rationale: A micrometer provides accurate measurement of rotor thickness.
9. A pulsating brake pedal during stops usually indicates:
A. Air in the system
B. Warped rotors
C. Low brake fluid
D. Faulty booster
Answer: B
Rationale: Rotor thickness variation or warping causes pedal pulsation.
