Land Rover Defender ABS Valve Block & Motor Assembly Repair – WABCO

Part No. 478 407 022 0 / SRB 500041 03 007839

101540 02 002446

#26414

This is a repair service for the WABCO ABS valve block and motor assembly fitted to Land Rover Defender models. These units are known to develop a range of hydraulic and electrical faults that affect braking performance and may trigger ABS warnings or failure modes.

Common Faults We Repair:

• Blocked solenoid valves (causing uneven braking or warning lights)

• Motor failure (ABS pump not activating or low pressure faults)

• Internal or external fluid leaks (from seals or pressure chamber)

• Shuttle valve switch failure (a common cause of the “Three Amigos” warning lights)

Applies To:

• Land Rover Defender (various models equipped with WABCO ABS)

• WABCO Part Number: 478 407 022 0

• Land Rover SRB Number: SRB 500041 03 007839

Service Includes:

• Disassembly and ultrasonic cleaning of valve block

• Motor function testing and repair/replacement if needed

• Resealing and replacement of worn seals

• Shuttle valve and sensor circuit repair

• Final bench testing for flow, pressure, and electrical integrity