303.02.0042 KNORR-BREMSE 4-circuit protection valve

The brake system requires precise pressure regulation to ensure safety and reliability in heavy commercial vehicles. This 4-circuit protection valve is designed to manage air distribution across multiple circuits, providing essential stability during operation. Built with high-strength components, it maintains optimal pressure levels even under demanding driving conditions.

303.02.0042 is the OE equivalent of the KNORR-BREMSE AE 4611 and II33856 used in KNORR-BREMSE brake systems. This component ensures seamless integration within the pneumatic architecture of the vehicle's braking circuit. By maintaining precise opening and closing thresholds, it protects the system from pressure drops and maintains operational integrity.

For workshop technicians, this unit features a robust design with specific port sizes including Port 1 (M22x1,5) and multiple M16x1,5 ports for circuits 21 through 24. It is designed to operate at a maximum pressure of up to 20 BAR, with specific opening pressures calibrated for high-performance standards. Regular inspections of the port connections and pressure thresholds are recommended during routine heavy vehicle maintenance.

Proper installation ensures that the pneumatic circuits function correctly, preventing unintended pressure fluctuations that could affect braking response. This part is a vital element for maintaining the safety standards required in the heavy commercial vehicle sector.