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.
Automann · Brakes & Wheel End
139.2831
In stock · ships from Knoxville
This is an automatic slack adjuster for heavy-duty truck and trailer air brake systems.
Confirm the part fits before you buy. Applications and interchange numbers are researched and audited per part.
Verified fitment for 1 applications
Add your truck to see whether it's one of them
All confirmed applications for this part number.
Universal fit
No specific vehicle application list is available; this is a universal replacement part for many heavy-duty truck and trailer models equipped with compatible S-cam brakes and 30/30 spring brake chambers. Verify arm length, spline size, and clevis thread before installation.
Part data verified against 5 catalog sources
Numbers this part supersedes or interchanges with. Showing 16 of 21.
Different year, make, or config? Get a confirmation against your truck in under a minute.
It automatically maintains proper clearance between the brake shoes and drum as the linings wear, ensuring consistent braking performance and compliance with safety regulations. It replaces worn or failed manual or automatic slack adjusters on axles with 1-1/2 inch, 28-spline S-cam shafts and 5/8-inch clevis connections. The 5.5-inch arm length is commonly used with Type 30/30 spring brake chambers. This aftermarket part is a Meritor-type design, suitable for a broad range of vehicles.
Part Number: 139.2831
MERITOR SLACK ADJUSTER
Dealer: KP Services Crossville
Compatibility, alternatives, and more
Parts commonly needed alongside brakes & wheel end
