303.01.0001 Relay Valve — Mercedes-Benz

The high-strength component is engineered to provide critical pneumatic control within the brake system of heavy commercial vehicles. Designed for durability in demanding environments, this relay valve ensures precise pressure regulation and reliable response during braking operations. Its robust construction is optimized for long-term service life in heavy-duty applications.

303.01.0001 is the OE-equivalent relay valve used in Mercedes-Benz ( 000 429 65 44 , 001 429 30 44 , 003 429 52 44 ), MAN ( 81.43609-6008 , 81.99164-3679 , 90.81011-4360 , 90.81011-4390 ), DAF ( 1505145 , 522545 , 522545A , 522545R ), IVECO ( 01278511 , 02444906 , 04625756 , 42015698 , 42020573 , 61578004 , 71005249 ), and Volvo ( 348909 , 384909 ) systems. This part also serves as a reliable replacement for WABCO ( 973 001 010 0 ) and Scania ( 1935623 ) hardware.

For workshop technicians performing maintenance or repairs, this component is designed for straightforward assembly with port specifications of M22x1,5 for ports 1, 2, and 4. It is essential to verify the pressure limits not to exceed the maximum rating of 10 BAR to ensure optimal system-wide functionality and safety during transit.