303.09.0002 Load Unloading Valve — MERCEDES BENZ

The heavy-duty load unloading valve is a critical component within the pneumatic brake system, ensuring precise pressure regulation for heavy commercial vehicle safety. This component is designed to manage air pressure transitions effectively during loading and unloading cycles, maintaining system stability throughout operation.

303.09.0002 is the OE-equivalent load unloading valve used in MERCEDES BENZ ( 000 566 18 26 ), MAN ( 81.52161-6174 , 81.52161-9174 ), DAF ( 700124 , 719701 ), IVECO ( 01271399 ), and WABCO ( 475 604 010 0 ) systems. It also provides compatibility for various heavy-duty platforms including NOOTEBOOM, VAN HOOL, and LIEBHERR.

Workshop technicians should ensure the lever position is set correctly at 0° before installation to guarantee optimal function. This part features M22x1,5 threading on both ports to meet standard industrial requirements for heavy commercial vehicles and specialized machinery. Regular checks of the adjustment ranges—specifically the empty pressure (0,8 - 2,2 BAR) and half pressure (2,8 - 3,7 BAR)—are recommended during routine maintenance to ensure braking reliability.