Air Brake Pressure Protection Valve For Tractor Trailer Pneumatic Modulator In Heavy Duty Trucks Replaces WAB 934 899 067 0 Built Tough With 3 8 Inch And 1 2 Inch NPT Threads And Reliable Performance
✔️ 8.95 in wide (227 mm) x 3.9 in high (99 mm), 3/8 in & 1/2 in NPT ports, single unit
This air brake pressure protection valve is a rugged, direct replacement part for heavy‑duty tractor‑trailer pneumatic braking systems. It protects the tractor’s air supply during trailer breakaway and prevents pressure loss, helping maintain reliable braking in demanding conditions. Commonly used on Freightliner Cascadia, Western Star, and Detroit Diesel rigs for long‑haul hauling.
✅ Dimensions: 8.95 in width (227 mm) x 3.9 in height (99 mm); ports: 3/8 in and 1/2 in NPT✅ High-strength cast metal body with durable internal seals for up to 150 PSI system pressure
✅ Direct replacement for 9348990670 and related part numbers to fit standard pneumatic brake platforms
✅ Integrated quick-release valve and precise airflow control to prevent pressure loss during trailer breakaway
✅ Silver color; single-unit pack for straightforward installation
💡 What is the role of an air brake pressure protection valve in tractor-trailer pneumatic braking systems? Here's a handy explanation. - It helps prevent pressure loss in the tractor air system during trailer breakaway. - It maintains safe, consistent braking by holding air pressure within operating limits. - It's designed for standard NPT ports (3/8 in and 1/2 in) to fit common heavy-duty rigs. - It serves as a direct replacement for widely used part numbers, simplifying maintenance.