Description
Overview
The ABS hydraulic pump and electronic control module for Citroën C4 and Peugeot 307 provides critical anti-lock braking and stability control functions. This assembly is commonly referenced by PSA part numbers and aftermarket codes such as 9657352780 and 4541J1.
Features
- Electric-driven high-pressure pump with integrated ABS valve block for rapid modulation of brake pressure
- On-board electronic control to detect wheel slip and command valve/pump action
- Direct-fit replacement for the listed PSA models when matching product codes
Common Faults And Lifespan
Typical failure modes include internal motor seizure, valve block contamination or sticking, corroded electrical connectors, and internal electronic faults. Lifespan depends on vehicle usage and environmental exposure; long-term exposure to moisture, road salt or contaminated brake fluid increases failure risk. Many units fail after high mileage or when water ingress occurs.
Installation And Replacement
- Disconnect the negative battery terminal before starting work to avoid electrical damage.
- Locate the ABS unit (position varies by model—typically in the engine bay or inner wheel arch area).
- Carefully disconnect the electrical connectors and brake lines; capture and dispose of brake fluid according to regulations.
- Unbolt the unit from its mounting points and replace with the correct part; use manufacturer torque settings for fasteners.
- Refill and thoroughly bleed the brake system to remove all air. Use a pressure or vacuum bleed method for best results.
- Perform ABS system initialization and error code clearing with a diagnostic tool to restore full functionality.
This job is suitable for professional mechanics and experienced DIYers. Proper brake bleeding and ECU reinitialization are required to ensure safe operation.
Compatibility And Notes
Frequently searched by part numbers 9657352780 and 4541J1. Always confirm fitment by cross-referencing the vehicle VIN and the additional reference numbers listed below before ordering.
Technical Information
- Manufacturer: PSA Citroën Peugeot
- Model: Citroën C4, Peugeot 307
- Product Codes: 9657352780, 4541J1
- Additional Numbers: 0265800395, 0265231486, 9649988280
