81521166045 Relay Valve for MAN Trucks

What does a relay valve do?

This relay valve plays a critical role in the pneumatic brake system of heavy commercial vehicles by managing air pressure distribution. It ensures that braking force is applied accurately and efficiently across the system, maintaining high-strength component performance under demanding operating conditions.

Vehicle and engine compatibility

The unit is specifically designed to be compatible with MAN vehicles. This component ensures precise air signal transmission within the braking circuit, maintaining stable pressure levels during deceleration and heavy load transitions.

Installation and maintenance

For correct installation, technicians should verify the port connections: Port 1 utilizes an M22x1,5 thread, while Port 2 and Port 4 utilize M16x1,5 threads. This valve is rated for a maximum operating pressure of 8 bar. Consult your authorized distributor for detailed fitment guidance.

System troubleshooting

Regular inspection of the pneumatic lines and port seals is recommended to prevent air leaks. Ensuring the system operates within the 8 bar limit helps maintain the longevity of all interconnected braking components.

OE cross-reference

303.01.0005 (Relay Valve Relay Valves) is the equivalent of the MAN OE number. This part directly replaces MAN OE number 81521166045.