T4 ASE BRAKES (MEDIUM/HEAVY DUTY
BRAKES) EXAM 2024/25!!
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
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
BRAKES) EXAM 2024/25!!
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
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
