T4 Brakes ASE 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
D. governor cut out pressure - answer B. wrong linings installed
which of the following could cause one brake on a truck to wear faster
than the others?
A. mismatched service brake chambers
B. mismatched parking chambers
C. low air pressure in service tanks
D. governor cut out too low - answer A. mismatched service chambers
what force is used to apply the foundation brake wheel cylinders?
A. hydraulic from the steering reservoir
B. mechanical
C. electrical
D. hydraulic from the master cylinder - answer D.
there's an audible air leak from under the dash when the foot valve is
applied. technician A says the double check valve may be faulty. Tech B
says the single check valve may be faulty. who's correct? - answer Tech A
only
, on a straight truck equipped with air brake, the secondary tank pressure
gauge falls to zero when the wet tank air is drained. Tech A says the one
way check valve is faulty, Tech B says the foot valve may be faulty. Who's
correct? - answer Tech A only. one way check valve protects secondary
tank
A loose wheel bearing adjustment can cause a faulty wheel speed sensor
and a wheel speed sensor code - answer
Air dryer purges too often. Tech A says the air dryer delivery check Valve
may be faulty. Tech B says a leaking wet tank could be the cause. Who's
correct? - answer C. Both Techs.
The safety valve releases on the air tank. Which is the most likely cause?
A. plugged line from the supply tank to governor.
B. faulty tractor protection valve
C. stuck spitter on the air drier
D. faulty secondary tank - answer A. if the line was plugged, the governor
would not unload the compressor
A truck with hydraulic disc/drum brakes has a high firm pedal with poor
stopping. what could be the cause? - answer The brake linings are glazed!
Glazed brake linings will allow the pedal to feel high and firm with no
stopping power
Air builds on a truck in 1.5 minutes. The specs. manual says it should take
3.5 min. Tech A says the air tanks could have water build up. Tech B says
the air tanks could have oil built up. Whos correct? - answer C. Both
technicians. Any Build up reduces volume for stored air
Brake fluid is leaking from the rear of a master cylinder on a hydro boost
brake system. What is the likely cause? - answer Primary seal leaking.
Air pressure build up time on a gear driven compressor is greater than
specifications. What is the cause?
A. a slipping drive
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
D. governor cut out pressure - answer B. wrong linings installed
which of the following could cause one brake on a truck to wear faster
than the others?
A. mismatched service brake chambers
B. mismatched parking chambers
C. low air pressure in service tanks
D. governor cut out too low - answer A. mismatched service chambers
what force is used to apply the foundation brake wheel cylinders?
A. hydraulic from the steering reservoir
B. mechanical
C. electrical
D. hydraulic from the master cylinder - answer D.
there's an audible air leak from under the dash when the foot valve is
applied. technician A says the double check valve may be faulty. Tech B
says the single check valve may be faulty. who's correct? - answer Tech A
only
, on a straight truck equipped with air brake, the secondary tank pressure
gauge falls to zero when the wet tank air is drained. Tech A says the one
way check valve is faulty, Tech B says the foot valve may be faulty. Who's
correct? - answer Tech A only. one way check valve protects secondary
tank
A loose wheel bearing adjustment can cause a faulty wheel speed sensor
and a wheel speed sensor code - answer
Air dryer purges too often. Tech A says the air dryer delivery check Valve
may be faulty. Tech B says a leaking wet tank could be the cause. Who's
correct? - answer C. Both Techs.
The safety valve releases on the air tank. Which is the most likely cause?
A. plugged line from the supply tank to governor.
B. faulty tractor protection valve
C. stuck spitter on the air drier
D. faulty secondary tank - answer A. if the line was plugged, the governor
would not unload the compressor
A truck with hydraulic disc/drum brakes has a high firm pedal with poor
stopping. what could be the cause? - answer The brake linings are glazed!
Glazed brake linings will allow the pedal to feel high and firm with no
stopping power
Air builds on a truck in 1.5 minutes. The specs. manual says it should take
3.5 min. Tech A says the air tanks could have water build up. Tech B says
the air tanks could have oil built up. Whos correct? - answer C. Both
technicians. Any Build up reduces volume for stored air
Brake fluid is leaking from the rear of a master cylinder on a hydro boost
brake system. What is the likely cause? - answer Primary seal leaking.
Air pressure build up time on a gear driven compressor is greater than
specifications. What is the cause?
A. a slipping drive
