T4 ASE Brakes EXAM WITH VERIFIED
|\ |\ |\ |\ |\ |\
ANSWERS
Psi loss rate for Straight Truck - CORRECT ANSWERS ✔✔2
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\
psi/minute
Psi loss rate for combination vehicle - CORRECT ANSWERS
|\ |\ |\ |\ |\ |\ |\ |\
✔✔less than 3 psi/minute
|\ |\ |\ |\
Service Brake Pressure Drop Test - CORRECT ANSWERS
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✔✔Apply service brake to 90 psi. Loss rate should be less
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\
than 3 psi/minute for straight vehicles and less than 4
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\
psi/minute for combination vehicles. |\ |\ |\
Improperly adjusted brake shoes - CORRECT ANSWERS |\ |\ |\ |\ |\ |\ |\
✔✔Cause
1) brake imbalance
|\ |\
2) increased stopping distance
|\ |\ |\
3) excessive heat and wear
|\ |\ |\ |\
,Instability and premature wear - CORRECT ANSWERS ✔✔a
|\ |\ |\ |\ |\ |\ |\
4 psi difference in the air delivery between axles is
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\
enough to cause instability and premature wear.
|\ |\ |\ |\ |\ |\
Troubleshooting poor brake performance due to air - |\ |\ |\ |\ |\ |\ |\ |\
CORRECT ANSWERS ✔✔1) inspect air compressor |\ |\ |\ |\ |\
2) verify pressure build up
|\ |\ |\ |\
3) look for clogged air compressor filter
|\ |\ |\ |\ |\ |\
4) possible slipping belt
|\ |\ |\
5) possible air leaks
|\ |\ |\
6) possible defective governor
|\ |\ |\
Pressure Governors - CORRECT ANSWERS ✔✔1) regulates
|\ |\ |\ |\ |\ |\ |\
air going to system
|\ |\ |\
2) adjustable pressure
|\ |\
3) defective governor or out of adjustment can cause
|\ |\ |\ |\ |\ |\ |\ |\ |\
compressor to function improperly. |\ |\ |\ |\
4) designed to regulate the compressors output.
|\ |\ |\ |\ |\ |\
5) may be attached to compressor or externally mounted.
|\ |\ |\ |\ |\ |\ |\ |\
Air Compressors - CORRECT ANSWERS ✔✔1) Power is
|\ |\ |\ |\ |\ |\ |\ |\
transferred to the air compressor by either an internal |\ |\ |\ |\ |\ |\ |\ |\ |\
gear or by an external belt. Belt is most common.
|\ |\ |\ |\ |\ |\ |\ |\ |\
, 2)air can be drawn directly from the atmosphere through
|\ |\ |\ |\ |\ |\ |\ |\ |\
a filter.
|\
3) Pistons push the air through a discharge valve to the
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\
supply reservoir. |\
Supply Reservoir "Wet Tank" - CORRECT ANSWERS ✔✔1)
|\ |\ |\ |\ |\ |\ |\ |\
tank closest to the compressor.
|\ |\ |\ |\ |\
2) "pop off valve" located on this tank to keep from over
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\
pressuring the system. |\ |\
Pop-off valve - CORRECT ANSWERS ✔✔Also known as the
|\ |\ |\ |\ |\ |\ |\ |\ |\
pressure relief valve, exhaust valve, adjustable pressure
|\ |\ |\ |\ |\ |\ |\
limiting (APL) valve, or overflow valve; this valve is the
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\
point of exit of excessive pressure buildup before
|\ |\ |\ |\ |\ |\ |\ |\
damaging air components. |\ |\
Manual and Automatic Drain Valves - CORRECT ANSWERS
|\ |\ |\ |\ |\ |\ |\
✔✔1) installed in each reservoir/tank to help purge the
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\
system from moisture. |\ |\
2)Used in high humid or wet climates.
|\ |\ |\ |\ |\ |\
3) manual drain valves should be drained on a daily basis
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\
|\ |\ |\ |\ |\ |\
ANSWERS
Psi loss rate for Straight Truck - CORRECT ANSWERS ✔✔2
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\
psi/minute
Psi loss rate for combination vehicle - CORRECT ANSWERS
|\ |\ |\ |\ |\ |\ |\ |\
✔✔less than 3 psi/minute
|\ |\ |\ |\
Service Brake Pressure Drop Test - CORRECT ANSWERS
|\ |\ |\ |\ |\ |\ |\ |\
✔✔Apply service brake to 90 psi. Loss rate should be less
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\
than 3 psi/minute for straight vehicles and less than 4
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\
psi/minute for combination vehicles. |\ |\ |\
Improperly adjusted brake shoes - CORRECT ANSWERS |\ |\ |\ |\ |\ |\ |\
✔✔Cause
1) brake imbalance
|\ |\
2) increased stopping distance
|\ |\ |\
3) excessive heat and wear
|\ |\ |\ |\
,Instability and premature wear - CORRECT ANSWERS ✔✔a
|\ |\ |\ |\ |\ |\ |\
4 psi difference in the air delivery between axles is
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\
enough to cause instability and premature wear.
|\ |\ |\ |\ |\ |\
Troubleshooting poor brake performance due to air - |\ |\ |\ |\ |\ |\ |\ |\
CORRECT ANSWERS ✔✔1) inspect air compressor |\ |\ |\ |\ |\
2) verify pressure build up
|\ |\ |\ |\
3) look for clogged air compressor filter
|\ |\ |\ |\ |\ |\
4) possible slipping belt
|\ |\ |\
5) possible air leaks
|\ |\ |\
6) possible defective governor
|\ |\ |\
Pressure Governors - CORRECT ANSWERS ✔✔1) regulates
|\ |\ |\ |\ |\ |\ |\
air going to system
|\ |\ |\
2) adjustable pressure
|\ |\
3) defective governor or out of adjustment can cause
|\ |\ |\ |\ |\ |\ |\ |\ |\
compressor to function improperly. |\ |\ |\ |\
4) designed to regulate the compressors output.
|\ |\ |\ |\ |\ |\
5) may be attached to compressor or externally mounted.
|\ |\ |\ |\ |\ |\ |\ |\
Air Compressors - CORRECT ANSWERS ✔✔1) Power is
|\ |\ |\ |\ |\ |\ |\ |\
transferred to the air compressor by either an internal |\ |\ |\ |\ |\ |\ |\ |\ |\
gear or by an external belt. Belt is most common.
|\ |\ |\ |\ |\ |\ |\ |\ |\
, 2)air can be drawn directly from the atmosphere through
|\ |\ |\ |\ |\ |\ |\ |\ |\
a filter.
|\
3) Pistons push the air through a discharge valve to the
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\
supply reservoir. |\
Supply Reservoir "Wet Tank" - CORRECT ANSWERS ✔✔1)
|\ |\ |\ |\ |\ |\ |\ |\
tank closest to the compressor.
|\ |\ |\ |\ |\
2) "pop off valve" located on this tank to keep from over
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\
pressuring the system. |\ |\
Pop-off valve - CORRECT ANSWERS ✔✔Also known as the
|\ |\ |\ |\ |\ |\ |\ |\ |\
pressure relief valve, exhaust valve, adjustable pressure
|\ |\ |\ |\ |\ |\ |\
limiting (APL) valve, or overflow valve; this valve is the
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\
point of exit of excessive pressure buildup before
|\ |\ |\ |\ |\ |\ |\ |\
damaging air components. |\ |\
Manual and Automatic Drain Valves - CORRECT ANSWERS
|\ |\ |\ |\ |\ |\ |\
✔✔1) installed in each reservoir/tank to help purge the
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\
system from moisture. |\ |\
2)Used in high humid or wet climates.
|\ |\ |\ |\ |\ |\
3) manual drain valves should be drained on a daily basis
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\
