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Pro-Par · Brakes & Wheel End
PROSA55073
In stock · ships from Knoxville
This is an automatic slack adjuster for heavy-duty truck and trailer air brake systems.
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Fitment is determined by the 28-spline, 5.5-inch straight arm configuration. Verify your existing slack adjuster specifications and arm style before ordering. This part is compatible with Meritor/Rockwell axles and many other applications.
Part data verified against 5 catalog sources
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It automatically maintains proper clearance between the brake shoes and drum as the linings wear, ensuring consistent braking. The unit has a straight arm, 5.5-inch length, 28-spline count, and a 1.50-inch shaft diameter, with stroke-sensing adjustment. It is a direct aftermarket replacement for Meritor R801073 and other OEM numbers, commonly used on many Class 8 trucks and trailers.
Part Number: PROSA55073
AUTO SLACK 28SP, 1-1/2, 5.5
Unit: ea
Dealer: KP Services Crossville
Compatibility, alternatives, and more
Parts commonly needed alongside brakes & wheel end
