303.01.0044 Relay Valve for DAF and Iveco

What does a relay valve do?

This relay valve serves as a critical component within the compressed air brake system of heavy commercial vehicles. Its primary function is to facilitate rapid air pressure transfer triggered by a pilot signal, ensuring efficient braking performance under heavy loads. Built with high-strength components, this valve maintains consistent pneumatic control throughout its service life.

Vehicle compatibility and fitment

This component is specifically designed for heavy commercial vehicle applications including trucks and tractor units from DAF, Iveco, and Renault Trucks. It is also compatible with WABCO systems to ensure reliable braking response in various industrial driving conditions.

Technical specifications and installation

The technical configuration includes four M22x1.5 ports (Port 1, Port 2, Port 41, and Port 42) and is rated for a maximum operating pressure of 10 BAR. When replacing this unit, technicians should ensure all connections are secure and check the pneumatic lines for any debris that could interfere with the pilot signal.

Maintenance guidance

Proper installation on the chassis ensures optimal air distribution between the main reservoir and the brake chambers. Maintaining clean air supply helps prevent premature wear of the internal seals within the valve body.

OE cross-reference

303.01.0044 (Relay Valve Relay Valves) is the equivalent of the DAF, Iveco, Renault Trucks and WABCO OE numbers. This part directly replaces DAF OE number 1518923. It also replaces Iveco OE number 4600022, Renault Trucks OE number 500370415 and WABCO OE number 4730170300.