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ASE Brakes T4 Practice Test #1
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ASE Brakes T4 Practice Test #1
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ASE Brakes T4 Practice Test #1Which 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 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 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? - -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 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 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 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.
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