When a brake pedal is pressed and the S-cam is turned, the S-cam:

Question

When a brake pedal is pressed and the S-cam is turned, the S-cam presses the brake shoes against the inside of the brake drum. This causes friction and will cause the vehicle to slow.

Accepted Answer

Presses the brake shoes against the inside of the brake drum.

Answer

Tightens the brake drum onto the axle.

Answer

Presses the brake lining against the wheel.

Answer

Releases air from the air tanks.