©THESTAR 2024/2025 ALL RIGHTS RESERVED 12:54PM.
T4 Brakes ASE Exam Questions And
Answers 2025 Update.
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
1
, ©THESTAR 2024/2025 ALL RIGHTS RESERVED 12:54PM.
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
B. a leaking service relay
C. leaking primary tank
D. leaking parking brake chamber - Answer✔C. A leaking primary air tank causes extended air
build up time
air leaks from the left front modulator valve during service operation. There are no ABS codes.
What is the cause? - Answer✔Modulator Valve seat
air is leaking from a quick release valve mounted on the front axle during service application.
What is the cause? - Answer✔Quick release
The three ports on a governor are: - Answer✔Reservoir, Unloaded and exhaust
Pressure valves open at : - Answer✔150PSI
A new drum will not fit over the brake shoes. All the following could be the cause EXCEPT:
2
T4 Brakes ASE Exam Questions And
Answers 2025 Update.
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
1
, ©THESTAR 2024/2025 ALL RIGHTS RESERVED 12:54PM.
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
B. a leaking service relay
C. leaking primary tank
D. leaking parking brake chamber - Answer✔C. A leaking primary air tank causes extended air
build up time
air leaks from the left front modulator valve during service operation. There are no ABS codes.
What is the cause? - Answer✔Modulator Valve seat
air is leaking from a quick release valve mounted on the front axle during service application.
What is the cause? - Answer✔Quick release
The three ports on a governor are: - Answer✔Reservoir, Unloaded and exhaust
Pressure valves open at : - Answer✔150PSI
A new drum will not fit over the brake shoes. All the following could be the cause EXCEPT:
2
