Description
Overview
High-quality Bosch ABS/ESP control module with integrated hydraulic pump, suitable for Citroën C4 and Peugeot 307 applications. This assembly is commonly referenced by product codes and is a direct-fit option when the part numbers match. Supplied with a section of wiring to simplify installation.
Function
The unit controls the anti-lock braking system (ABS) and electronic stability program (ESP)/traction functions by processing wheel speed sensor inputs and actuating the hydraulic pump and valves to modulate brake pressure. Proper operation maintains vehicle stability during hard braking and helps prevent wheel lock and loss of control.
Common Failure Modes
- Electronic faults in the control module due to moisture, corrosion or internal component failure.
- Hydraulic pump motor wear or seizure after long service life or contamination.
- Corroded or damaged electrical connectors and wiring leading to intermittent faults.
- Faults triggered by failing wheel speed sensors or wiring, which can cause the module to enter a fault state.
Replacement And Fitment Notes
The ABS/ESP unit is typically located in the engine bay, mounted near the brake master cylinder or firewall on PSA vehicles. Replacement steps (general guidance):
- Disconnect the negative battery terminal before starting work.
- Access and disconnect electrical connectors and remove any obstructing components.
- Carefully disconnect brake lines, catching fluid and preventing contamination; prepare for a full brake bleed after installation.
- Unbolt and remove the old module, install the replacement, reconnect lines and connectors, then bleed the brake system.
- Clear fault codes and, if required, perform module coding/calibration with an appropriate diagnostic tool to match the vehicle VIN and ensure full ESP/ABS functionality.
Because ABS/ESP systems are safety-critical, accurate bleeding of the brake system and verification with a diagnostic scanner are strongly recommended. Some vehicles may require professional programming or adaptation of the new unit.
Compatibility
Designed for Citroën C4 and Peugeot 307 models that use the listed part numbers. Always verify fitment by comparing product codes before purchase.
Technical Information
- Manufacturer: Bosch / PSA (Citroën, Peugeot)
- Model: Citroën C4; Peugeot 307
- Product Codes: 9663241380; 0265235235
- Additional Numbers: 9661887180; 4541Q7; 4541Q8; 4541FV
Who Should Buy
This assembly is suitable for professional auto mechanics and experienced DIY enthusiasts who are comfortable with brake system work, electrical connections and diagnostic procedures. If in doubt about coding or bleeding, consult a qualified workshop.
