ASE S4 Brakes Exam Practice Questions and Answers
The air system is maintained at what pressure? - Answer️️ -100 to
120 pounds per square inch.
At what pressure does the low pressure switch activate? -
Answer️️ -Below 60 pounds per square inch.
A safety or pop off valve is usually inst...
What does the two way check valve do in the air brake system? -
Answer✔️✔️-It allows dominant pressure to activate the stoplight
switch and to release the parking brakes.
What is the standard releases of the parking brake system in the
event of a failure? - Answer✔️✔️-At least once during a failure of
either primary or secondary system pressure.
Why are relay valves used in a rear air brake system? - Answer✔️✔️-
To minimize delay of brake application on long wheel based
applications.
What determines the crack pressures on a air brake system relay
valve? - Answer✔️✔️-How heavily loaded the axle is. The size of the
axle's brakes. Aggressiveness of the linings.
What is a quick release valve used for in air brake systems? -
Answer✔️✔️-It allows brake actuation air to be quickly exhausted
near the brakes it serves.
What is the minimum apply time of air brake systems? -
Answer✔️✔️-0.45 seconds.
What is the minimum release time of air brake systems? -
Answer✔️✔️-0.55 seconds.
What is a ratio valve in air brake systems? - Answer✔️✔️-Also known
as a pressure reducing valve, limits air pressure to the front axle.
They have a variety of hold off pressures.
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