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.
Aurora · Brakes & Wheel End
PROSA56211
In stock · ships from Knoxville
This is an automatic slack adjuster for air brake systems on heavy-duty trucks and trailers.
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.
Other applications
Other applications
Designed as an aftermarket replacement in the Haldex style. Confirmed cross-reference to Navistar FLT40010211. Suitable for many standard heavy-duty truck and trailer axle configurations requiring a 1.5-inch, 28-spline automatic slack adjuster with a 5.5-inch stroke and straight arm.
Part data verified against 4 catalog sources
Numbers this part supersedes or interchanges with. Showing 3 of 3.
Different year, make, or config? Get a confirmation against your truck in under a minute.
It automatically maintains the correct clearance between the brake shoes and drum as the brake linings wear, which helps keep braking consistent and reduces the need for manual adjustments. You would replace a slack adjuster if it is seized, has excessive free play, or is no longer adjusting properly. This model has a straight arm, a 1.5-inch diameter spline with 28 teeth, and a 5.5-inch stroke length.
Part Number: PROSA56211
HALDEX 1.50 - 28SPL - 5.5 SLACK ADJUSTER
Dealer: Post Onsite
Compatibility, alternatives, and more
Parts commonly needed alongside brakes & wheel end
