Image is for illustration purposes only. Actual part may vary.
170.K021562
This is an SR7 type spring brake modulating valve used in heavy-duty truck air brake systems. It controls the application and release of the spring brakes and prevents the service and spring brakes from being applied at the same time (anti-compounding). Replace this valve if you experience air leaks, sticking, slow brake release, or if the spring brakes won’t hold or release reliably.
Universal fit
Designed as a generic SR7 spring brake valve for a wide range of heavy-duty trucks and trailers with spring brake chambers. Installation may require matching port sizes and mounting. No specific vehicle application list was verified, but it replaces original Bendix SR‑7 valves on many makes, including Mack (via cross‑referenced numbers).
Part Number: 170.K021562
SR7 VALVE
Dealer: Post Onsite
Compatibility, alternatives, and more
Parts commonly needed alongside air system
