3944460 ISB Single Cylinder Compressor

What does an air brake compressor do?

This single cylinder air brake compressor serves as a critical component in the pneumatic braking system of heavy commercial vehicles. By converting mechanical energy into pressurized air, it ensures the air processing unit receives the necessary volume to maintain consistent braking performance. The unit is built with high-strength components to withstand the rigorous thermal and pressure cycles found in heavy-duty engine environments.

Engine compatibility and fitment

This specific model is designed for compatibility with Cummins engines, including the 6BT5.9, 6CT8.3, ISB, QSB, and C50 series. Its integrated water-cooled design helps regulate operating temperatures during sustained heavy-load operation, making it suitable for long-haul and construction machinery applications.

Technical installation and maintenance

Technicians should note the M27x2 air outlet port and M10x1 unloader port during installation. The unit features a through-drive configuration and a water-cooled valve plate to optimize efficiency. Regular inspection of the 3/4 16UNF water inlet and outlet ports is recommended to prevent leaks within the cooling circuit.

Troubleshooting air pressure issues

Maintaining steady air pressure is vital for fleet safety. If air pressure build-up slows or leakage is detected at the ports, checking the valve plate and cooling connections is a standard troubleshooting step.

OE cross-reference

2500 090 001 (Single Cylinder Compressor) is the equivalent of the Cummins OE number. This part directly replaces Cummins OE number 3944460.