303.01.0017.01 WABCO Compatible Relay Valve Repair Kit

A Relay Valve Repair Kit is a diaphragm, O-ring, valve washer and spring set designed to overhaul the relay valve that delivers fast, balanced air to the rear axle brake chambers in a heavy commercial vehicle's air brake system.

This component is essential for maintaining the pneumatic integrity of the braking system. By replacing worn internal elements, technicians can restore precise air delivery and ensure rapid brake response times. The kit is compatible with WABCO systems found across a wide range of heavy-duty vehicles, including Volvo models like the FH series and VNL, Mack Pinnacle and Granite, and Renault Trucks Magnum and Premium models. It is also fitted to DAF trucks.

For workshop technicians, performing an overhaul with this kit is a cost-effective alternative to a full valve replacement. When servicing the air brake system, it is vital to inspect the diaphragm surfaces and seals for signs of wear or fatigue to prevent air leaks or delayed braking action.

Consult your authorized distributor to ensure exact fitment for your specific vehicle application.

OE cross-reference

303.01.0017.01 (Relay Valve Repair Kit Relay Valves) is the equivalent of the WABCO OE number. This part directly replaces WABCO OE number 9730110062.