Question

The service air line is often controlled by the foot brake and is attached to the ____ valves.

Answers

Relay

Supply

Emergency

Explanation

The service air line carries air and is controlled by either the foot brake or trailer hand brake. The service air line is attached to relay valves, which allow the trailer brakes to be applied quickly.

This questions appears in the following tests:

Alabama Combination

Alaska Combination

Idaho Combination

Louisiana Combination

Tennessee Combination

Utah Combination

Vermont Combination

Washington Tank

Washington Combination