301.01.0031 Unloader Valve for DAF and MAN

What does an unloader valve do?

This unloader valve plays a critical role in the pneumatic brake system by regulating air pressure within the compressor circuit. By maintaining the correct operating pressure, it prevents over-pressurization and ensures the continuous stability of the air supply required for heavy-duty braking and suspension functions.

Vehicle and system compatibility

This component is specifically engineered for compatibility with DAF, Liebherr, MAN, Mercedes-Benz, Renault Trucks, and VDL vehicles. It is also suitable for use within WABCO systems found in various heavy commercial applications. The design ensures reliable performance under demanding operating conditions.

Installation and maintenance

Technicians should verify that port connections match the existing installation requirements, specifically noting the M22x1.5 and M12x1.5 thread sizes. Ensuring clean connection points during assembly helps maintain the integrity of the air circuit and prevents leaks in the pneumatic system.

System troubleshooting

Regular inspection of the valve during routine brake system service can help identify early signs of pressure fluctuations or air leaks.

OE cross-reference

301.01.0031 (Unloader Valve) is the equivalent of the DAF, Liebherr, MAN, Mercedes-Benz, Renault Trucks, VDL and WABCO OE numbers. This part directly replaces DAF OE number 1518287. It also replaces Liebherr OE number 502655508, MAN OE numbers 81521016191, 84521016015, 88521016005, 88521026006, 88521026042, 88521026047, 88521026054, 88521026060, 88521026076, 88521026085, Mercedes-Benz OE numbers 0024311606, 0024314706, 0024315306, 0024318806, Renault Trucks OE number 5010019862, VDL OE number 41518287 and WABCO OE number 9753035040.