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S-Cam Air Brakes - Trailer Parts 4U
www.trailerparts4u.comS-Cam Air Brakes Operation Trailer air brakes are operated by the tractor air supply through a series of relay and check valves. When braking is desired, the air is supplied to the axle air chamber which applies a force that is multiplied by the slack adjuster lever arm length. This force is transmitted rotationally through the camshaft which ...