T4 ASE BRAKES (MEDIUM/HEAVY DUTY BRAKES) EXAM 2024/25!!
An air leak at point X in the system shown would would cause which of these to leak down?
- -#1 tank only
--The Driver Vehicle inspection Report (DVIR) should be submitted: - -Daily
--Which of the following cannot cause a drum on an air braked vehicle to overheat? - -Too
high governor cut out pressure
--All the brakes drag on a truck with hydraulics brakes. Which of the following could be the
cause? - -No brake pedal free travel
--Which of the following could cause a pulsating brake pedal on a truck with hydraulic
brakes - -An out of round brake drum
--Air pressure gauges change an air pressure signal into an electronic voltage signal using
which component? - -Transducer
--Tech A says that linings worn too thin on an air braked vehicle can cause the S-cam shaft to
roll over. Tech B says this condition can cause excess brake pedal travel. Who is right? - -
Tech A
--Spring brakes on an air braked vehicle must be able to hold the vehicle facing uphill or
downhill on what percent grade? - -20%
--The drive of a truck with hydraulic brakes says the pedal reserve is too low. Tech A says the
brakes could be out of adjustment. Tech B says one brake system may have failed. Who is
right? - -Both Tech A and Tech B
--The parking brakes fail to apply on a truck with air brakes. Tech A says this could be caused
by low air pressure in the spring brake chamber. Tech B says this could be caused by a
ruptured spring brake diaphragm. Who is right? - -Neither
--Tech A says the low pressure warning indicator is located on the secondary reservoir tank.
Tech B says the low pressure warning indicator operates once system air pressure falls
below 80 psi. Who's right? - -Neither
--The warning light on a truck with an anti lock brake system lights when the truck is started.
When the truck is moving, the light stays on. What could be the cause? - -Misadjusted wheel
sensor
--The driver of a truck with air brakes says it has poor stopping power. What could be the
cause? - -Air pressure too low
service line restricted
brakes adjusted incorrectly.
An air leak at point X in the system shown would would cause which of these to leak down?
- -#1 tank only
--The Driver Vehicle inspection Report (DVIR) should be submitted: - -Daily
--Which of the following cannot cause a drum on an air braked vehicle to overheat? - -Too
high governor cut out pressure
--All the brakes drag on a truck with hydraulics brakes. Which of the following could be the
cause? - -No brake pedal free travel
--Which of the following could cause a pulsating brake pedal on a truck with hydraulic
brakes - -An out of round brake drum
--Air pressure gauges change an air pressure signal into an electronic voltage signal using
which component? - -Transducer
--Tech A says that linings worn too thin on an air braked vehicle can cause the S-cam shaft to
roll over. Tech B says this condition can cause excess brake pedal travel. Who is right? - -
Tech A
--Spring brakes on an air braked vehicle must be able to hold the vehicle facing uphill or
downhill on what percent grade? - -20%
--The drive of a truck with hydraulic brakes says the pedal reserve is too low. Tech A says the
brakes could be out of adjustment. Tech B says one brake system may have failed. Who is
right? - -Both Tech A and Tech B
--The parking brakes fail to apply on a truck with air brakes. Tech A says this could be caused
by low air pressure in the spring brake chamber. Tech B says this could be caused by a
ruptured spring brake diaphragm. Who is right? - -Neither
--Tech A says the low pressure warning indicator is located on the secondary reservoir tank.
Tech B says the low pressure warning indicator operates once system air pressure falls
below 80 psi. Who's right? - -Neither
--The warning light on a truck with an anti lock brake system lights when the truck is started.
When the truck is moving, the light stays on. What could be the cause? - -Misadjusted wheel
sensor
--The driver of a truck with air brakes says it has poor stopping power. What could be the
cause? - -Air pressure too low
service line restricted
brakes adjusted incorrectly.
