EVIP - Brakes, Auxiliary Brakes Systems And Gauges:
Q’s And A’s
What are the two types of friction brake mechanisms? Correct Ans -
Drum brake and Disc brake
What are the two materials used in brake lines to activate the brake
mechanism? Correct Ans - Air and brake (hydraulic) fluid
What are 6 reasons that larger diesel trucks use air brake systems?
Correct Ans - 1. Lines can be disconnected without a mess
2. No pedal fade due to hot brake fluid
3. A small leak will not affect the system dramatically
4. The large diesel engine can run an air compressor easily
5. The system is split into two separate parts to prevent a full system failure
6. The system is fail safe
What is the optimal PSI used in air brake systems? Correct Ans - 125 PSI
What are the two primary sections of an air brake system? Correct Ans -
Service brake and spring brake
In addition to the spring brake, newer fire apparatus have a parking brake.
How does this brake function? Correct Ans - The parking brake
pressurizes the front service brake cans
What should the angle between the pushrod and the slack adjuster be when
brakes are properly adjusted? Correct Ans - 90 degrees
What type of slack adjustors do SFD rigs have? Correct Ans - Automatic
slack adjustors
Which type of brake mechanism is more resistant to brake fade, and why?
Correct Ans - Disc brakes are more resistant to brake fade because they
dissipate heat more effectively than drum style brakes
What should be used when going down hill in order to prevent brake fade?
Correct Ans - Retarders/Jake brakes
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