T4 BRAKES ASE EXAM QUESTIONS AND
ANSWERS 100% PASS 2026 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 - ANS 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 - ANS 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 - ANS D.
1 @COPYRIGHT 2025/2026 ALLRIGHTS RESERVED.
, 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? - ANS 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? - ANS 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 - ANS
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? - ANS 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 - ANS 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? - ANS 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? - ANS 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? - ANS Primary seal leaking.
2 @COPYRIGHT 2025/2026 ALLRIGHTS RESERVED.
ANSWERS 100% PASS 2026 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 - ANS 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 - ANS 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 - ANS D.
1 @COPYRIGHT 2025/2026 ALLRIGHTS RESERVED.
, 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? - ANS 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? - ANS 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 - ANS
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? - ANS 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 - ANS 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? - ANS 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? - ANS 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? - ANS Primary seal leaking.
2 @COPYRIGHT 2025/2026 ALLRIGHTS RESERVED.
