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Post Onsite · Brakes & Wheel End
4-243
In stock · ships from Knoxville
This is an S-cam brake camshaft for heavy-duty trailer axles.
Confirm the part fits before you buy. Applications and interchange numbers are researched and audited per part.
We don't publish fitment for this part yet. Rather than guess, get it confirmed against your truck in under a minute.
It converts the rotational force from the air brake chamber and slack adjuster into linear force that spreads the brake shoes against the drum to stop the vehicle. You typically replace it when the splines wear down, the head shows flat spots, or the bearing journals become grooved — all of which cause uneven braking and noise. This specific part is a left-hand rotation camshaft, used on the driver-side or passenger-side depending on axle orientation.
Part Number: 4-243
L/H RW CAM 20 3/8 10 SPINE
Unit: ea
Dealer: Post Onsite
Compatibility, alternatives, and more
Parts commonly needed alongside brakes & wheel end
