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Truck & Transport
Truck and Transport Mechanic Red Seal Certification
Air Brake Fundamentals
Knowledge Check
Air Brake Fundamentals
Knowledge Check
Knowledge Check
1 / 10
Why are relay valves used in air brake systems instead of running air directly from the foot valve to the rear brake chambers?
A
Relay valves prevent over-pressurization of the brake chambers during hard stops
B
Relay valves filter moisture from the air before it reaches the brake chambers
C
Relay valves reduce wear on the foot valve by limiting the volume of air passing through it
D
Relay valves use a small signal to control large local air flow, eliminating dangerous delays in application and release
Check Answer
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