Description
Product Overview
High-quality Bosch ABS/ESP control module and hydraulic pump assembly designed for PSA Group vehicles. Ideal for professional workshops and experienced DIY mechanics, this unit is commonly searched by its part numbers (0265950464, 9664148780, 4541AF) for fast compatibility checks. The unit controls the Anti-Lock Braking System (ABS) and the Electronic Stability Program (ESP), ensuring safer braking and stability under emergency or low-traction conditions.
This specific item includes a piece of the original wiring harness to assist with installation and electrical connections. Always verify fitment by matching the listed product codes with your vehicle's existing part number.
Why This Part Fails And Typical Symptoms
ABS/ESP modules commonly fail due to corrosion, water ingress, damaged connectors or wiring, and internal electronic faults caused by electrical surges. Symptoms of a failing unit include the ABS and/or ESP warning lights on the dashboard, loss of ABS modulation, continuous pump operation, or stored fault codes in the braking system. In some cases, wheel speed sensor faults or hydraulic blockages mimic control unit failures, so a full diagnostic is recommended before replacement.
Replacement And Installation Notes
- Safety First: Disconnect the vehicle battery before starting work to avoid short circuits or unintended airbag deployment.
- Removal: Safely support the vehicle, depressurize the brake system if necessary, disconnect electrical connectors and carefully remove the hydraulic lines from the unit. Mark or photograph hose positions to ensure correct reassembly.
- Refit: Install the unit, reconnect hydraulic lines and electrical plugs, then refill and bleed the brake system to remove air. Use approved brake fluid and follow manufacturer torque settings.
- Coding & Diagnostics: Most Citroën/Peugeot ABS/ESP modules require coding or pairing with the vehicle using OEM tools (e.g., DiagBox) or compatible diagnostic equipment. After installation, clear fault codes and perform a full system check.
- Recommendation: If you are not equipped with the correct diagnostic tools, have the vehicle coded and checked by a qualified workshop to ensure full functionality and safety.
Fitment Guidance
This unit is intended for PSA Group vehicles and is commonly fitted to the Citroën C4 Grand Picasso (2008). Always confirm compatibility by matching the product codes listed below with the part number on your vehicle. Searching by the part number is often the fastest and most reliable way to confirm fitment.
Technical Information
Manufacturer: Bosch
Model: ABS/ESP Control Module (Hydraulic Unit With Electronic Control)
Product Codes: 0265950464, 0265235010, 9660934580, 9664148780, 4541AF, 4541QE, 4541AG
Other Numbers: PSA Group References (Citroën / Peugeot)
Useful Tips For Buyers
Search By Part Number: Many mechanics and DIYers locate this component by its OE numbers; include them in your search to speed up compatibility checks. Because the unit interacts directly with the braking system, proper bleeding and diagnostic confirmation are essential after replacement. The included harness piece can simplify reconnection but does not remove the need for correct coding.
If you need assistance confirming fitment or understanding the programming requirements for your vehicle, contact a qualified technician or supply the vehicle VIN and the part numbers listed above when ordering.
