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Question:

How do air-operated disc brakes work?

A Air pressure acts on the brake chamber and slack adjuster. The pressure of the brake chamber on the slack adjuster turns the power screw.
explanation

In air-operated disc brakes, air pressure acts on a brake chamber and slack adjuster, like s-cam brakes. But instead of the s. cam, a "power screw" is used. The pressure of the brake chamber on the slack adjuster turns the power screw.
(According to CDL Handbook )

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