Description
Overview
This ABS pump assembly with wiring harness is designed for Citroën C4 and Peugeot 307 applications using the listed PSA part numbers. The unit combines the hydraulic pump, electronic control module and associated wiring to manage anti-lock braking and help maintain vehicle stability during heavy braking events.
Key Features
- Complete ABS/ESP hydraulic and electronic assembly including wiring harness for direct replacement on compatible vehicles.
- Controls wheel slip by modulating hydraulic pressure to each brake circuit via the pump and valve block.
- Often located next to the brake master cylinder in the engine bay and commonly referenced by OE numbers for easier lookup.
Fitment And Compatibility
Intended for Citroën C4 and Peugeot 307 models that use the PSA/Delphi/Continental ABS assemblies referenced by the part numbers below. Because ABS modules are often exchanged between model variants, always verify compatibility against the vehicle VIN or existing part number before ordering. Customers frequently search by product code (see Technical Information).
Replacement Guide
- Safety first: disconnect the negative battery terminal to prevent electrical damage and airbag/ABS faults.
- Access the ABS unit in the engine bay (typically near the brake master cylinder). Remove covers and secure the vehicle on level ground.
- Label brake lines and electrical connectors. Carefully loosen and remove hydraulic lines; be prepared for brake fluid loss.
- Unplug electrical connectors and remove mounting bolts securing the pump/module assembly.
- Install the new unit, torque mounting bolts to manufacturer values, and reconnect hydraulic lines using new sealing washers if required.
- Refill brake fluid and perform a thorough brake bleeding procedure. For systems with ABS valves, use the correct ABS bleeding routine or a pressure bleeder; air in the system will compromise braking performance.
- Reconnect the battery, clear fault codes with a diagnostic scanner, and perform a road test to confirm ABS functionality and absence of warning lights.
Common Failure Causes And Service Life
Failures typically result from electrical faults in the electronic control unit, internal motor wear in the pump, corrosion of hydraulic passages or connectors, water ingress, or damaged wiring harnesses. Lifespan varies with use and environment; many units last over 10 years but can fail earlier in harsh or salty conditions. Regular visual inspection of connectors and harness routing helps prevent premature issues.
Tools And Recommendations
- Basic hand tools, line wrenches for brake fittings, torque wrench.
- Brake fluid meeting manufacturer specification (DOT rating as required).
- Diagnostic scanner capable of reading/clearing ABS codes and initiating ABS valve/pump bleed cycles if necessary.
Technical Information
- Manufacturer: PSA (Citroën/Peugeot)
- Model: Citroën C4; Peugeot 307
- Product Codes: 9657352780, 0265800395, 0265231486, 9649988280
- Other Numbers: 4541J1
Note: Always confirm the required part number for the specific vehicle VIN before ordering. If an ABS fault persists after replacement, re-check electrical connections, grounding points and run a full diagnostic cycle to clear and test ABS functions.
