BC Transit – Air Brake Course

Hand Valve Application (trailer connected)
This time, the operator has elected to apply the hand valve only. (independent
application of the trailer brakes.) As before, the application air dead-ends at
the tractor protection valve. The tractor protection valve relays the request by
sending the requested air pressure from the supply line, down the service line.
Again, the air “dead-ends” at the emergency relay valve, which relays the
required pressure from the trailer reservoir to the trailer brake chambers.
Left click to start animation
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