Buy wp20573 - Genuine Bendix Air Brake Compressor BA-921 - wisentpartscenter.com

Description

Genuine Bendix 5018652 BA-921 Air Brake Compressor is a single-cylinder, engine-driven compressor used on Detroit Diesel Series 60 applications to supply compressed air for the vehicle’s air-brake and auxiliary pneumatic systems. The BA-921 uses a water-cooled cylinder head and engine-driven reciprocating design to build system air pressure whenever compressor output is required.

Key Functions
- Supplies compressed air to the truck’s brake reservoirs and auxiliary air circuits.
- Uses a single-cylinder reciprocating design driven directly by the engine.
- Water-cooled head controls compressor temperature during continuous operation.
- Works with the air governor and unloader system to regulate when the compressor builds pressure.

Verify fitment with us before ordering to ensure the correct part for your application.

Purpose of the Part

The 5018652 keeps the truck’s air system supplied with pressurized air for braking and other pneumatic equipment. As reservoir pressure falls, the compressor loads and builds air; once system pressure reaches the governor setting, the unloading system allows the compressor to stop pumping against the air system while the engine continues to turn it.

Issue Symptoms / When to Replace

A worn compressor may build air slowly, fail to recover pressure after repeated brake applications, pass excessive oil into the discharge line, or develop abnormal mechanical noise. Coolant or oil leakage around the compressor can also indicate a problem. Before replacing it, check for air-system leaks, governor problems, a restricted discharge line, and air-dryer issues because these can produce similar slow-build complaints.

Brand Information

Bendix develops braking, air-management, and vehicle-control components for commercial trucks. The BA-921 is Bendix’s single-cylinder heavy-duty air compressor design, rated at 15.8 CFM calculated displacement at 1,250 RPM and used by Detroit Diesel on Series 60 engine installations. Bendix also supports this compressor through OE, service, and factory-remanufactured part numbers.

Installation Notes

Make sure the compressor oil supply, coolant passages, air intake, and discharge line are clean and unrestricted before the replacement unit is installed.

How to Identify an OEM Part

A genuine unit can be identified by the Bendix factory identification plate showing the Bendix logo, BA-921 model, and Bendix piece number.

Why Buy 5018652 from Wisent Parts

  • ⏱️
    Fast shipping
    Orders before 12PM EST ship same business day.
  • 🛡️
    180-day warranty
    All parts covered from delivery date.
  • ↩️
    Easy returns
    30-day returns.
  • ✅
    Verify fitment
    Send VIN/ESN and we’ll confirm.

Shop with confidence

Warranty & Return Information
Warranty Information

Wisent Parts offers a 180-day warranty on all parts from the date of delivery. This warranty covers orders placed directly through our website. If a part fails during this period, we’re here to help - whether it’s a replacement, repair, or refund. For full details, refer to the Warranty page.

Return Information

Wisent Parts accepts returns within 30 days of delivery. All returns are subject to a restocking fee. To qualify, parts must be unused and in their original condition. For full return instructions and restocking fee details, please refer to the Returns page.