303.01.0038 Volvo Compatible Relay Valve

What does a relay valve do?

This relay valve serves as a critical component within the compressed air brake system of heavy-duty vehicles. By facilitating rapid air pressure transfer triggered by a pilot signal, it ensures that braking force is applied efficiently and reliably to the brake chambers.

Compatible Volvo models and engines

This component is specifically designed for various Volvo models, including the F10, F12, F7, FL10, FL12, N10, N12, NL10, NL12, B10B, B10M, and B12 trucks. It is also compatible with Volvo engines such as the TD100, TD101, TD102, TD120, TD121, TD122, TD70, TD71, TD103, D10A, TD123, and D12A. This part serves as an equivalent for WABCO systems.

Installation and maintenance

The valve features precise port configurations with M22x1.5 and M16x1.5 threading to ensure a secure fit during installation. When replacing this unit on the chassis, technicians should verify the integrity of all connected air lines and ensure the maximum operating pressure does not exceed 10 BAR.

System performance guidance

Maintaining the pneumatic system by inspecting relay valves can prevent braking lag or uneven pressure distribution across the axles. Consult your authorized distributor to check the compatibility list.

OE cross-reference

303.01.0038 (Relay Valve Relay Valves) is the equivalent of the Volvo and WABCO OE numbers. This part directly replaces Volvo OE numbers 3162118, 3173150. It also replaces WABCO OE number 9730110110.