Bendix Brakes K109119 Air Compressor Unloader Valve Repair Kit for BA-921

The Bendix K109119 is a genuine unloader valve rebuild kit designed specifically for BA-921 series air compressors used in heavy-duty truck air brake systems. This essential maintenance kit prevents pressure buildup and ensures proper air brake system operation by regulating air flow and preventing overloading that could damage critical brake components.

Kit Includes:

• Cover gasket
• Balance piston
• Unloader piston
• Springs
• O-rings (3)
• Cap screws (2)
• Lubricating grease

Application Notes:

• Replaces unloader valves on Detroit and Navistar versions of the BA-921 compressor (non-bushed valves)
• Each kit services one unloader assembly
• One kit required for BA-921 compressors; two kits needed for BA-922 compressors
• Reuse the existing unloader cap from your compressor (cap no longer included per Bendix specifications)

This genuine Bendix replacement kit provides reliable, long-lasting performance and helps prevent unnecessary downtime and expensive repair costs in commercial vehicle applications.