ASE BRAKES T4 PRACTICE TEST #1
EXAM QUESTIONS AND ANSWERS 2026
VERIFIED.
Which of the following could cause the brakes on a truck to wear too fast?
A. Glazed Drums
B. Wrong linings installed
C. Low air pressure in the service tanks
D. Governor cut-out pressure too high - ANS Answer A is incorrect. Glazed drum linings are
hard and do not wear. They also do not stop the truck.
Answer B is correct. The wrong lining for the application may be the problem.
Answer C is incorrect. Low air pressure in the tanks would not cause brake wear. It may cause a
low amount of reserve air in case of multiple brake applications.
Answer D is incorrect. High governor cut=out pressure may cause the safety valve to open, but
would not cause the brakes to wear too fast.
Which of the following could case one brake on a truck to wear faster than the others?
A. Mismatched service brake chambers
B. Mismatched parking brake chambers
C. Low air pressure in the service tanks
D. Governor cut-out pressure too low - ANS Answer A is correct. Mismatched brake service
chambers would apply unequal brake application pressure from side to side, which would cause
one brake to wear faster.
@2026/2027 ALLRIGHTS RESERVED.
,Answer B is incorrect. Mismatched parking brake chambers would not cause brake wear. It
would possibly allow the brake to roll when parked, because one side could have insufficient
parking brake application.
Answer C is incorrect. Low air pressure in the tanks would not cause brake wear. It may cause a
low amount of reserve air in case of multiple brake applications
Answer D is incorrect. Low governor cut-out pressure may cause an inadequate amount of air in
reserve but would not cause the brake to wear too fast.
There is an audible air leak from under the dash when the foot valve is applied. Technician A
says the double-check valve may be faulty. Technician B says the single-check valve may be
faulty. Who is correct? - ANS A. A only
B. B only
C. Both A and B
D. Neither A nor B
Answer A is correct. A leaking double check valve could allow air to flow to the foot valve and
out the open exhaust
Answer B is incorrect. Single check valves are used to protect the tanks. They do not cause an air
leak when the brakes are applied.
Answer C is incorrect. Technician B is incorrect.
Answer D is incorrect. Technician A is correct.
On a straight truck equipped with air brakes, the secondary tank pressure gauge falls to zero
when she wet air tank is drained. Technician A says the one-way check valve may be faulty.
Technician B says the foor valve may be faulty. Who is correct?
A. A only
B. B only
C. Both A and B
D. Neither A nor B - ANS Answer A is correct. The one way check valve should protect the
secondary tank. The check valve is leaking.
Answer B is incorrect. The foot valve does not separate the wet and secondary tanks.
Answer C is incorrect. Technician B is incorrect.
@2026/2027 ALLRIGHTS RESERVED.
, Answer D is incorrect. Technician A is correct.
Which of the following could set an antilock braking system (ABS) wheel speed sensor code:
A. Faulty modulator hold solenoid
B. Faulty modulator release solenoid
C. Incorrect wheel bearing adjustment
D. Incorrect brake adjustment - ANS Answer A is incorrect. A faulty solenoid would not cause
a wheel speed sensor code. It could cause a modulator valve code.
Answer B is incorrect. A faulty solenoid would not cause a wheel speed sensor code. It could
cause a modulator valve code
Answer C is correct. A loose wheel bearing adjustment can cause a faulty wheel speed sensor
and a wheel speed sensor code.
Answer D is incorrect. An incorrect brake adjustment may cause a dragging brake but would not
cause a wheel speed sensor code
The air drier purged too often. Technician A says the air drier delivery check valve may be
leaking. Technician B says a leaking wet tank could be the cause. Who is correct?
A. A only
B. B only
C. Both A and B
D. Neither A nor B - ANS Answer A is incorrect. Technician B is also correct.
Answer B is incorrect. Technician A is also correct.
Answer C is correct. A leaking air drier check valve will allow the wet tank to drain back through
the air drier. This will cause air pressure to drop to governor cut-in rapidly. The air compressor
will again build tank pressure and unload, and the sequence will start over. A leaking wet tank
will cause the air pressure to fall rapidly and the compressor to build air again and then cut out.
This too will cause the air drier to purge often.
Answer D is incorrect. Both technicians are correct.
The safety valve releases on the air tank. Which of the following is the most likely cause?
A. Plugged line from the supply tank to the governor
@2026/2027 ALLRIGHTS RESERVED.
EXAM QUESTIONS AND ANSWERS 2026
VERIFIED.
Which of the following could cause the brakes on a truck to wear too fast?
A. Glazed Drums
B. Wrong linings installed
C. Low air pressure in the service tanks
D. Governor cut-out pressure too high - ANS Answer A is incorrect. Glazed drum linings are
hard and do not wear. They also do not stop the truck.
Answer B is correct. The wrong lining for the application may be the problem.
Answer C is incorrect. Low air pressure in the tanks would not cause brake wear. It may cause a
low amount of reserve air in case of multiple brake applications.
Answer D is incorrect. High governor cut=out pressure may cause the safety valve to open, but
would not cause the brakes to wear too fast.
Which of the following could case one brake on a truck to wear faster than the others?
A. Mismatched service brake chambers
B. Mismatched parking brake chambers
C. Low air pressure in the service tanks
D. Governor cut-out pressure too low - ANS Answer A is correct. Mismatched brake service
chambers would apply unequal brake application pressure from side to side, which would cause
one brake to wear faster.
@2026/2027 ALLRIGHTS RESERVED.
,Answer B is incorrect. Mismatched parking brake chambers would not cause brake wear. It
would possibly allow the brake to roll when parked, because one side could have insufficient
parking brake application.
Answer C is incorrect. Low air pressure in the tanks would not cause brake wear. It may cause a
low amount of reserve air in case of multiple brake applications
Answer D is incorrect. Low governor cut-out pressure may cause an inadequate amount of air in
reserve but would not cause the brake to wear too fast.
There is an audible air leak from under the dash when the foot valve is applied. Technician A
says the double-check valve may be faulty. Technician B says the single-check valve may be
faulty. Who is correct? - ANS A. A only
B. B only
C. Both A and B
D. Neither A nor B
Answer A is correct. A leaking double check valve could allow air to flow to the foot valve and
out the open exhaust
Answer B is incorrect. Single check valves are used to protect the tanks. They do not cause an air
leak when the brakes are applied.
Answer C is incorrect. Technician B is incorrect.
Answer D is incorrect. Technician A is correct.
On a straight truck equipped with air brakes, the secondary tank pressure gauge falls to zero
when she wet air tank is drained. Technician A says the one-way check valve may be faulty.
Technician B says the foor valve may be faulty. Who is correct?
A. A only
B. B only
C. Both A and B
D. Neither A nor B - ANS Answer A is correct. The one way check valve should protect the
secondary tank. The check valve is leaking.
Answer B is incorrect. The foot valve does not separate the wet and secondary tanks.
Answer C is incorrect. Technician B is incorrect.
@2026/2027 ALLRIGHTS RESERVED.
, Answer D is incorrect. Technician A is correct.
Which of the following could set an antilock braking system (ABS) wheel speed sensor code:
A. Faulty modulator hold solenoid
B. Faulty modulator release solenoid
C. Incorrect wheel bearing adjustment
D. Incorrect brake adjustment - ANS Answer A is incorrect. A faulty solenoid would not cause
a wheel speed sensor code. It could cause a modulator valve code.
Answer B is incorrect. A faulty solenoid would not cause a wheel speed sensor code. It could
cause a modulator valve code
Answer C is correct. A loose wheel bearing adjustment can cause a faulty wheel speed sensor
and a wheel speed sensor code.
Answer D is incorrect. An incorrect brake adjustment may cause a dragging brake but would not
cause a wheel speed sensor code
The air drier purged too often. Technician A says the air drier delivery check valve may be
leaking. Technician B says a leaking wet tank could be the cause. Who is correct?
A. A only
B. B only
C. Both A and B
D. Neither A nor B - ANS Answer A is incorrect. Technician B is also correct.
Answer B is incorrect. Technician A is also correct.
Answer C is correct. A leaking air drier check valve will allow the wet tank to drain back through
the air drier. This will cause air pressure to drop to governor cut-in rapidly. The air compressor
will again build tank pressure and unload, and the sequence will start over. A leaking wet tank
will cause the air pressure to fall rapidly and the compressor to build air again and then cut out.
This too will cause the air drier to purge often.
Answer D is incorrect. Both technicians are correct.
The safety valve releases on the air tank. Which of the following is the most likely cause?
A. Plugged line from the supply tank to the governor
@2026/2027 ALLRIGHTS RESERVED.
