303.01.0014 Compatible Relay Valve — Ford Trucks

What does a relay valve do?

A relay valve is a complete pneumatic control unit in the air brake system of heavy commercial vehicles that receives the control signal from the brake pedal and feeds the rear axle or trailer brake chambers directly from the nearest air reservoir.

Compatible vehicles and engines

This component is essential for reducing braking lag by eliminating the delay caused by long air lines, directly determining brake response time and release speed. It is frequently utilized in the rear axle circuit of trucks and tractor units, as well as in the main control blocks of trailers.

Installation and maintenance

Specifically engineered for Ford Trucks, this unit is compatible with various Cargo models including the 1826, 2532, and 3238, across multiple engine types such as Ecotorq 7.3, 9.0 (Euro 5), and FPT Cursor (Euro 5). It also serves other heavy-duty applications including DAF, MAN, Scania, and Mercedes-Benz trucks.

Troubleshooting and performance

Maintenance should focus on inspecting the M22x1.5 and M16x1.5 VOSS ports for any signs of air leaks or debris buildup. To ensure optimal performance, technicians should verify that the valve operates within its maximum 10 BAR pressure rating and check for uneven braking symptoms that may indicate internal seal wear.

OE cross-reference

303.01.0014 (Relay Valve Relay Valves) is the equivalent of the Alexander Dennis, DAF, Ford Trucks, Hino, Iveco, Lohr, MAN, Mercedes-Benz, Provia, Scania, VDL and WABCO OE numbers. This part directly replaces Alexander Dennis OE number DP002103. It also replaces DAF OE numbers 1259856, 1504965, Ford Trucks OE number T199352, Hino OE number 445400110A, Iveco OE number 5010206016, Lohr OE number F10003356, MAN OE numbers 81521166071, 81521169071, Mercedes-Benz OE number 0044297644, Provia OE number PRO6430020, Scania OE number 1935665, VDL OE numbers 1193451, 41193451 and WABCO OE number 9730112000.