The air system is maintained at what pressure? correct answers 100 to 120 pounds per square inch.
At what pressure does the low pressure switch activate? correct answers Below 60 pounds per square inch.
A safety or pop off valve is usually installed in which reservoir? correct answers In the ...
ASE S4 Brakes (Correct answers)
The air system is maintained at what pressure? correct answers 100 to 120 pounds per square inch.
At what pressure does the low pressure switch activate? correct answers Below 60 pounds per square
inch.
A safety or pop off valve is usually installed in which reservoir? correct answers In the one closest to the
compressor.
Why is the Wet tank referred to as such? correct answers It is the one closest to the compressor and has
the most water in it.
What is an after cooler used for in an air system? correct answers It condenses and eliminates most of the
water from an air system.
What does an air drier do in a air system? correct answers They usually contain a bed of desiccant
material which captures water and oil.
What does the dual control foot valve control? correct answers After the wet tank the valve controls the
primary and secondary systems.
In a normal operation what does the primary air brake system control? correct answers The rear axle
brakes.
In a normal operation what does the secondary air brake system control? correct answers The front axle
brakes.
What does the two way check valve do in the air brake system? correct answers 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? correct answers At
least once during a failure of either primary or secondary system pressure.
, Why are relay valves used in a rear air brake system? correct answers To minimize delay of brake
application on long wheel based applications.
What determines the crack pressures on a air brake system relay valve? correct answers 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? correct answers It allows brake actuation air
to be quickly exhausted near the brakes it serves.
What is the minimum apply time of air brake systems? correct answers 0.45 seconds.
What is the minimum release time of air brake systems? correct answers 0.55 seconds.
What is a ratio valve in air brake systems? correct answers Also known as a pressure reducing valve,
limits air pressure to the front axle. They have a variety of hold off pressures.
What is the first step in system diagnosis of air brake systems? correct answers The driver should be
interviewed.
If air brake systems are not applying and releasing properly, and grabbing or dragging what could be the
cause? correct answers Defective supply system components.
If air brake systems have instability and premature wear what could be the cause? correct answers As
little as a 4 pounds per square inch difference between axles can cause this.
If all around braking performance is poor or low air pressure is prevalent what could be the cause? correct
answers Clogged compressor air filter. Slipping belt. Air leaks. Restricted lines. Defective governor.
Malfunctioning air compressor.
If air system pressure is too high what could be the cause? correct answers Defective governor. Reservoir
safety valve. Governor's cut off pressure.
With the engine running at an idle what should be the pressure build up time? correct answers 85 to 100
pounds per square inch within 45 seconds. 25 seconds at full governed speed.
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