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Question
When a brake pedal is pressed and the S-cam is turned, the S-cam:
Answers
A.  Presses the brake shoes against the inside of the brake drum.
B.  Tightens the brake drum onto the axle.
C.  Presses the brake lining against the wheel.
D.  Releases air from the air tanks.
Explanation
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.

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