ASE Brakes T4 Practice Test #1
fully solved & updated 2025-
2026(latest version verified for
accuracy)
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 - answer 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 - answer 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.
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? - answer 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 - answer 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.
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 - answer 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 - answer 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?
fully solved & updated 2025-
2026(latest version verified for
accuracy)
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 - answer 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 - answer 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.
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? - answer 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 - answer 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.
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 - answer 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 - answer 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?
