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Automann · Brakes & Wheel End
133.2840
In stock · ships from Knoxville
This is a Haldex-type automatic slack adjuster with a 5.5-inch straight arm and 1.5"-28 spline count, designed for heavy-duty truck and trailer air brake systems.
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Universal fit
Fits most heavy-duty truck and trailer axles with S-cam air brakes requiring a 5.5-inch straight, unhanded automatic slack adjuster with 1.5"-28 splines.
Part data verified against 5 catalog sources
Numbers this part supersedes or interchanges with. Showing 7 of 7.
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It automatically maintains proper brake shoe-to-drum clearance as the lining wears, reducing manual adjustments and ensuring consistent stopping power. The part number 133.2840 is an Automann economy replacement for the Haldex 40010211 and similar units. Replace when the slack adjuster no longer holds adjustment, becomes stiff, or shows physical damage.
Part Number: 133.2840
SLACK ADJUSTERS 5.5''// PROSA56211
Unit: ea
Dealer: KP Services Crossville
Compatibility, alternatives, and more
Parts commonly needed alongside brakes & wheel end
