802540 Air Brake Module Valve for Freightliner and Mack Application

It is designed for Freightliner and Mack applications where a compatible module-style air brake valve is specified. Always verify fitment by matching the part number and port/thread requirements for your exact system. If you are cross-referencing, it is commonly identified as a PAI 802540 valve for these platforms.

Check that your existing unit uses 1/8in-27 NPT threads before installing. Compare the number of ports, their orientation, and any labeling to ensure the air lines will route correctly. Using the wrong thread type or forcing fittings can create leaks and lead to poor braking performance in a heavy-duty truck air brake valve circuit.

This type of work should be done by a qualified technician familiar with air brake systems. After installing a Freightliner air brake valve or Mack air brake module valve, the system must be checked for leaks and verified for proper air distribution and brake response. Always follow OEM procedures for depressurizing the system and performing post-repair functional tests.