800840
Relay Valve
Bendix

Relay valve used to coordinate braking signals between tractor and trailer and to control service and emergency actuation sequencing. The porting set includes an exhaust port with 3/8 PTC threads and multiple supply and delivery ports sized for typical tractor and trailer hoses. The dimensional footprint lists width 136.22 mm, height 91.95 mm, length 125.73 mm with a mounting thread of M6 x 1, enabling secure installation on the vehicle frame or control bracket. The system supports a tractor trip pressure range of 20 to 40 psi, trailer trip 25 to 45 psi, and trailer override pressure 20 to 30 psi, allowing coordinated brake response for both units under varying load conditions. Operating temperature ranges from -40 to 200 F, preserving performance from cold ambient to hot engine bays. VMRS 013-010-050 locates this part within the relay valve family, with category 41370 identifying its role in signaling and actuation hardware. This component is essential for ensuring timely brake application and release across tractor and trailer links, contributing to overall braking system safety and performance in highway, city, and heavy haul operations. Check port compatibility with existing hoses and verify mounting hardware during installation.