303.01.0010.01 Compatible Relay Valve Repair Kit for Volvo

What does a relay valve repair kit do?

A relay valve repair kit is a specialized set containing diaphragms, O-rings, washers, and springs designed to overhaul the relay valve within a heavy commercial vehicle's air brake system. The relay valve senses pilot air from the foot brake valve and redirects reservoir air directly to the brake chambers, which significantly shortens brake response time and ensures balanced air distribution.

Compatible vehicles and engines

This repair kit is engineered to fit Volvo vehicles such as the B10M, F10, F12, FL10, FL12, N10, N12, B12, B10B, NL10, and NL12. It is also compatible with Ford Trucks models like the Cargo 1830, 1824, 2524, 2530, 3230, and 3530. Additionally, it can be fitted to other heavy-duty vehicles including MAN, Scania, DAF, Iveco, and Renault Trucks.

Maintenance and installation guidance

For workshop technicians performing maintenance, using a high-strength component kit allows for the restoration of braking performance without requiring a complete valve replacement. When performing an overhaul, ensure all seals are seated correctly to prevent air leaks and maintain consistent pressure in the pneumatic circuit. Consult your authorized distributor to verify specific fitment.

Troubleshooting braking performance

Regular inspection of the relay valve assembly can help prevent brake delay caused by worn diaphragm surfaces. Replacing these components proactively helps maintain the integrity of the entire pneumatic braking system.

OE cross-reference

303.01.0010.01 (Relay Valve Repair Kit Relay Valves) is the equivalent of the WABCO OE numbers. This part directly replaces WABCO OE numbers 9730110000S1, 9730110010S1, 9730110050S1, 9730110110S1.