Which types of foundation brakes are used on air-brake equipped trucks and trailers?

A) S-cam-actuated
B) air disc brakes
C) air wedge-actuated
D) all of the above

Foundation Brakes

The braking components downstream from the actuator that mechanically effect braking on a wheel. In a truck S-cam brake assembly, the foundation brakes consist of a slack adjuster, an S-camshaft, brake shoes, and a drum.

S-Cam-Actuated

Describes a type of brake system, particularly in heavy vehicles, where the braking action is initiated by the rotation of an S-shaped cam.

Air Disc Brakes

Air disc brakes are a type of brake system for heavy-duty vehicles that use air pressure to apply pressure to a disc, slowing or stopping the vehicle.