Description
Control module, ABS pump, ABS ESP unit BOSCH for CITROËN C4 and PEUGEOT 307. Hydraulic brake control block with a piece of wiring.
This Bosch ABS/ESP hydraulic unit is a direct-fit braking control module for Citroën C4 and Peugeot 307 models. It integrates the pump, valve block and electronic control to manage anti-lock braking and electronic stability functions. Ideal for professional workshops and experienced DIY mechanics, this unit is frequently searched by OE numbers such as 9663241380 and 0265235235 — include these references in your diagnostics and parts lookup to ensure correct fitment.
Designed to regulate brake pressure during ABS and ESP interventions, the module rapidly modulates hydraulic circuits and operates the pump to restore pressure when valves close. The delivered unit includes part of the original wiring harness for easier installation. Typical buyers are repair shops and owners performing in-garage replacements who need a reliable replacement part that restores braking stability and ABS performance.
Technical information
- Manufacturer: Bosch
- Model: Citroën C4; Peugeot 307
- Product Codes: 9663241380, 0265235235, 9661887180, 0265950635
- Other Numbers: 4541J1, NFP
Installation recommendations
- Work Safely: Perform the replacement on a level surface using correct lifting equipment. Wear eye protection and gloves.
- Disconnect Battery: Always disconnect the vehicle battery before starting to avoid short circuits or damage to the control electronics.
- Access: Remove undertray or inner wing liners as required to gain access to the ABS hydraulic unit. Protect painted surfaces from brake fluid.
- Electrical and Hydraulic Disconnection: Carefully disconnect the electrical connector(s) and cap brake lines to prevent contamination and fluid loss. Note the position of each hydraulic port.
- Removal and Fitment: Unbolt the module from its bracket and remove it together with the attached wiring segment. Fit the replacement unit in the original orientation and torque mounting bolts to manufacturer values.
- Brake Fluid and Bleeding: Refill with the correct specification brake fluid. After installation, fully bleed the brake system, including ABS pump activation cycles — this may require a diagnostic bleed procedure to remove trapped air from the hydraulic block.
- Coding and Initialization: The vehicle may require fault clearing, initialization or coding of the ABS/ESP unit with a suitable PSA diagnostic tool to restore full functionality. If unsure, have programming performed by a qualified technician with appropriate diagnostic equipment.
Why this part most commonly fails
- Corrosion and Moisture Ingress: Exposure to road salt and moisture can corrode the valve block, connectors and electronic components, causing electrical faults or hydraulic leakage.
- Contaminated Brake Fluid: Particles and moisture in old brake fluid can clog valves or wear internal components of the pump and valve assembly.
- Electrical Failures: Pump motor burnout, relay faults or connector oxidation lead to loss of ABS pump function or communication errors.
- Mechanical Damage: Impacts or improper handling during previous repairs can damage hydraulic ports or the housing.
- Age And Mileage: On vehicles with high mileage or long service life, wear of internal valves and pump components becomes more likely.
Additional notes
Search for the unit using the OE numbers listed above to confirm compatibility. After replacement, verify there are no warning lights on the dash and perform a road test in a safe environment to confirm ABS and ESP interventions behave correctly.
