303.02.0007 Compatible 4-Circuit Protection Valve

What does a 4-circuit protection valve do?

This 4-circuit protection valve serves as a critical component within the pneumatic braking system of heavy commercial vehicles. Its primary function is to distribute air supply pressure to four independent circuits while isolating any single circuit in the event of a pressure loss, ensuring continued braking capability.

Compatible vehicles and engines

The component is designed for high-demand applications and is compatible with Volvo models including FH, FM, FMX, and VNL series, as well as Renault Trucks Kerax and Magnum, and Mack Granite or Pinnacle trucks. It is also suitable for various engine configurations such as D13, D12, and MP8.

Installation and maintenance

Installation should be performed by a qualified workshop technician to ensure correct orientation and connection. The unit features specific opening pressures for the secondary ports (6.3 BAR for ports 21/22 and 5.8 BAR for ports 23/24) to maintain proper system balance. Always verify port sizes—M22x1.5 for the inlet and M16x1.5 for the outlets—before installation.

System reliability

Regular inspection of the pneumatic lines connected to this valve can help prevent air leaks and ensure the integrity of the entire brake control assembly.

OE cross-reference

303.02.0007 (4-circuit protection valve) is the equivalent of the Knorr-Bremse and Volvo OE numbers. This part directly replaces Knorr-Bremse OE number AE4604. It also replaces Volvo OE numbers 20382309, 20452151, 20716313, 20755195, 3197588.