EM36570 MAC745-229859 Quick Release Valve

It speeds up brake release by venting air close to the brake chambers instead of routing it back through longer air lines. That quicker exhaust helps reduce brake lag and supports more consistent brake response. It’s a key air brake system valve used on many heavy-duty truck air brake valve applications.

These part numbers are commonly used as cross-references for the same quick release valve design and function. Before installing, match the ports and mounting style to the existing valve and confirm the number stamping on the old unit if available. If your system calls out either number, the MAC745-229859 quick release valve and EM36570 are typically considered interchangeable references.

Yes—internal wear, contamination, or a damaged seal can prevent proper exhausting and may lead to slow release or constant leaking from the valve exhaust. Check for hissing at rest, delayed brake release, and moisture or debris in the air lines feeding the PAI EM36570 valve. Replacing a faulty air brake quick release valve can restore proper pneumatic control and help protect other air brake system valve components.