Your cart is empty
Browse our catalog to find the parts you need.
These images are illustrative and may not match the product exactly. Always verify by part number — or confirm instantly with the assistant using a photo or VIN.

Meritor · Brakes & Wheel End
R801042
In stock · ships from Knoxville
The Meritor R801042 is an automatic slack adjuster for heavy-duty drum brakes with a 1.5-inch diameter, 10-spline S-cam shaft.
Confirm the part fits before you buy. Applications and interchange numbers are researched and audited per part.
Verified fitment for 2 applications
Add your truck to see whether it's one of them
All confirmed applications for this part number.
Other applications
Other applications
Unhanded (fits left or right). Yellow piston. Verify camshaft diameter and spline count for your vehicle.
Part data verified against 5 catalog sources
Numbers this part supersedes or interchanges with. Showing 16 of 17.
Different year, make, or config? Get a confirmation against your truck in under a minute.
It automatically maintains proper brake shoe-to-drum clearance as linings wear, eliminating manual adjustments and ensuring consistent braking. Replace it when it seizes, over-strokes, or as part of a preventive brake overhaul.
Part Number: R801042
10 SPLINE AUTO SLACK
Unit: ea
Dealer: Post Onsite
Compatibility, alternatives, and more
Parts commonly needed alongside brakes & wheel end