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HDX400-10143
The Haldex HDX400-10143 (also known as 40010143) is an automatic slack adjuster for heavy-duty air brake systems. It automatically maintains proper clearance between brake shoes and drum, compensating for lining wear to ensure consistent braking and reduce the need for manual adjustments. This part is typically replaced during brake servicing when the adjuster fails to hold adjustment or shows signs of wear, helping prevent brake dragging or excessive pedal travel.
Designed for standard drive axle configurations using Haldex AA1 automatic slack adjusters. Cross-references to OEM numbers for Freightliner, Navistar, Mack, PACCAR, and other major truck brands. Always verify exact fit using the vehicle manufacturer’s parts catalog before purchase.
Part Number: HDX400-10143
SLACK ADJUSTER
Dealer: Knox Trailers
Compatibility, alternatives, and more
Parts commonly needed alongside brakes & wheel end
