ASE S4 Brakes Exam Questions with All Correct Answers
124 views 0 purchase
Course
ASE S4 Brakes
Institution
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.
The benefits of buying summaries with Stuvia:
Guaranteed quality through customer reviews
Stuvia customers have reviewed more than 700,000 summaries. This how you know that you are buying the best documents.
Quick and easy check-out
You can quickly pay through credit card or Stuvia-credit for the summaries. There is no membership needed.
Focus on what matters
Your fellow students write the study notes themselves, which is why the documents are always reliable and up-to-date. This ensures you quickly get to the core!
Frequently asked questions
What do I get when I buy this document?
You get a PDF, available immediately after your purchase. The purchased document is accessible anytime, anywhere and indefinitely through your profile.
Satisfaction guarantee: how does it work?
Our satisfaction guarantee ensures that you always find a study document that suits you well. You fill out a form, and our customer service team takes care of the rest.
Who am I buying these notes from?
Stuvia is a marketplace, so you are not buying this document from us, but from seller Perfectscorer. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy these notes for $11.99. You're not tied to anything after your purchase.
