ASE T4 EXAM 1 Medium & Heavy-Duty
Brakes Study Guide Air Brakes, ABS &
Diagnostics Review 2026/ 2027 | 100%
Verified with Correct Questions and
Answers | Complete ASE T4 Certification
Exam Prep Study Resource with Solution
1. A drum is chattering on the brake lathe. This could be the
result of:
A. Failure to install the dampening belt.
B. Cutting too slowly.
C. Dull cutting blades.
D. Cutting speed too fast.
Correct Answer: A. Failure to install the dampening belt.
2. A vehicle equipped with a hydro-boost brake system has
a hard pedal with little braking action. Which of the
following could be the cause?
A. Low brake fluid
B. Air in the brake fluid
,C. Low power steering fluid
D. An overtightened power steering belt
Correct Answer: C. Low power steering fluid
3. Which of the following could cause excessive noise
while braking?
A. Worn wheel cylinders
B. Worn caliper pistons
C. Seized caliper slides
D. Missing clips
Correct Answer: D. Missing clips
4. A vehicle equipped with a "hill holding" option has an
ABS code. Which tool would most likely be used to
check the wheel speed sensor?
A. AC volt meter
B. Ohm meter
C. Scan tool
D. Ammeter
Correct Answer: C. Scan tool
5. The brake system has a soft, sinking pedal with the
engine running. The brake fluid level is at the correct
height. Which of the following could be the cause?
, A. A restricted vacuum hose
B. A leaking master cylinder
C. A bypassing master cylinder
D. A stuck open vacuum check valve
Correct Answer: C. A bypassing master cylinder
6. Technician A says a hydro-boost system can use the
power steering pump to operate the booster. Technician B
says a hydro-boost system can use engine vacuum to
operate the booster. Who is correct?
A. A
B. B
C. Both A and B
D. Neither A nor B
Correct Answer: A. A
7. A disc brake caliper is dragging. All of the following
could be the cause EXCEPT:
A. Binding pins.
B. Sticking piston.
C. Binding caliper.
D. Worn brake pads.
Correct Answer: D. Worn brake pads.
Brakes Study Guide Air Brakes, ABS &
Diagnostics Review 2026/ 2027 | 100%
Verified with Correct Questions and
Answers | Complete ASE T4 Certification
Exam Prep Study Resource with Solution
1. A drum is chattering on the brake lathe. This could be the
result of:
A. Failure to install the dampening belt.
B. Cutting too slowly.
C. Dull cutting blades.
D. Cutting speed too fast.
Correct Answer: A. Failure to install the dampening belt.
2. A vehicle equipped with a hydro-boost brake system has
a hard pedal with little braking action. Which of the
following could be the cause?
A. Low brake fluid
B. Air in the brake fluid
,C. Low power steering fluid
D. An overtightened power steering belt
Correct Answer: C. Low power steering fluid
3. Which of the following could cause excessive noise
while braking?
A. Worn wheel cylinders
B. Worn caliper pistons
C. Seized caliper slides
D. Missing clips
Correct Answer: D. Missing clips
4. A vehicle equipped with a "hill holding" option has an
ABS code. Which tool would most likely be used to
check the wheel speed sensor?
A. AC volt meter
B. Ohm meter
C. Scan tool
D. Ammeter
Correct Answer: C. Scan tool
5. The brake system has a soft, sinking pedal with the
engine running. The brake fluid level is at the correct
height. Which of the following could be the cause?
, A. A restricted vacuum hose
B. A leaking master cylinder
C. A bypassing master cylinder
D. A stuck open vacuum check valve
Correct Answer: C. A bypassing master cylinder
6. Technician A says a hydro-boost system can use the
power steering pump to operate the booster. Technician B
says a hydro-boost system can use engine vacuum to
operate the booster. Who is correct?
A. A
B. B
C. Both A and B
D. Neither A nor B
Correct Answer: A. A
7. A disc brake caliper is dragging. All of the following
could be the cause EXCEPT:
A. Binding pins.
B. Sticking piston.
C. Binding caliper.
D. Worn brake pads.
Correct Answer: D. Worn brake pads.
