The usual maximum cam-to-bushing radial play permissible in an s-cam assembly is .030".
S-cam:
- The principle of the S-cam allows the brakes of big vehicles to be more compact and less moving parts, since it only relies on a rotating shaft. Generally speaking, a tractor trailer requires more brakes than a typical vehicle, so making the brakes as simple and as cost effective as possible is very important.
- Students need to understand that even when S-CAM brakes are set up properly, dragging S-CAM shoes can still occur due to worn-out or broken return springs, worn-out backing plates, or a combination of these factors.
- The brake shoes are pushed against the inside of the brake drum by the S-cam, which separates them from one another. The S-cam rotates back when the brake pedal is released, and a spring lifts the brake shoes away from the drum, allowing the wheels to roll freely once more.
- [tex].030[/tex] is typically the maximum cam-to-bushing radial play allowed in an s-cam assembly.
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