303.02.0005.02 Compatible Knorr-Bremse 4-Circuit Protection Valve Repair Kit

A 4-circuit protection valve repair kit restores the critical seals, diaphragms, and internal components of the protection valve within the pneumatic brake system. This component plays a vital role by distributing air pressure into four independent circuits, ensuring that a leak in one circuit does not compromise the entire braking system's integrity. By renewing these wear parts, technicians can restore the valve to its original pressure balance and response speed.

This repair kit is compatible with Knorr-Bremse systems found in a wide range of heavy commercial vehicles, including Volvo models like the FM, FH, VNL, and Mack Granite. It is also fitted to DAF, Iveco, and MAN trucks. For precise fitment, always verify the specific valve housing details against the vehicle chassis number to ensure correct circuit priority and connection dimensions.

When performing maintenance, it is essential to inspect the piston and spring calibration to maintain the correct opening sequence. Using high-strength components helps prevent air leaks and ensures reliable operation under heavy loads. Proper installation helps maintain the pressure balance required for front axle, rear axle, and auxiliary consumer circuits.

Regular inspection of the pneumatic system can prevent unexpected downtime. If a drop in air pressure or a failure in circuit isolation is detected, a professional overhaul using this kit is a cost-effective solution for restoring system functionality.

Check the compatibility list.

OE cross-reference

303.02.0005.02 (4-Circuit Protection Valve Repair Kit) is the equivalent of the Knorr-Bremse OE number. This part directly replaces Knorr-Bremse OE number KSK0004.