ASE S4 Brakes Exam Questions with All Correct Answers
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ASE S4 Brakes
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ASE S4 Brakes
ASE S4 Brakes Exam Questions with All Correct Answers
The air system is maintained at what pressure? - ANSWER 100 to 120 pounds per square inch.
At what pressure does the low pressure switch activate? - ANSWER Below 60 pounds per square inch.
A safety or pop off v...
ASE S4 Brakes Exam Questions with All Correct Answer s The air system is maintained at what pressure? - ANSWER 100 to 120 pounds per square inch. At what pressure does the low pressure switch activate? - ANSWER Below 60 pounds per square inch. A safety or pop off valve is usually installed in which reservoir? - ANSWER In the one closest to the compressor. Why is the Wet tank referred to as such? - ANSWER 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? - ANSWER It condenses and eliminates most of the water from an air system. What does an air drier do in a air system? - ANSWER The y usually contain a bed of desiccant material which captures water and oil. What does the dual control foot valve control? - ANSWER After the wet tank the valve controls the primary and secondary systems. In a normal operation what does the primary air brake system control? - ANSWER The rear axle brakes. In a normal operation what does the secondary air brake system control? - ANSWER The front axle brakes. What does the two way check valve do in the air brake sy stem? - 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 hav e a variety of hold off pressures. What is the first step in system diagnosis of air brake systems? - ANSWER The driver should be interviewed. If air brake systems are not applying and releasing properly, and grabbing or dragging what could be the cause? - ANSWER Defective supply system components. If air brake systems have instability and premature wear what could be the cause? - ANSWER As little as a 4 pounds per square inch difference between axles can cause t his. If all around braking performance is poor or low air pressure is prevalent what could be the cause? - ANSWER 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? - ANSWER Defective governor. Reservoir safety valve. Governor's cut off pressure.
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