Description
High-quality Bosch ABS/ESP control module designed for PSA applications, commonly fitted to Citroën and Peugeot vehicles. This assembly combines the hydraulic pump, electronic control unit and connector block to manage anti-lock braking (ABS) and electronic stability program (ESP) functions. Supplied with a piece of wiring to aid installation and identification.
Technical Information
- Manufacturer: Bosch (originally supplied for PSA – Citroën / Peugeot)
- Model: Citroën C4 Grand Picasso (example fitment: 2008). Verify with VIN and part numbers before purchase.
- Product Codes: 0265950464, 0265235010, 9660934580, 9664148780
- Additional Numbers: 4541AF, 4541QE, 4541AG
Function And Application
The unit controls ABS and ESP by monitoring wheel speed sensors and modulating hydraulic pressure via the integrated pump and valves. It prevents wheel lock during braking and assists vehicle stability under adverse conditions. It is a key safety component in modern braking systems and must match vehicle electronic configuration.
Common Faults And Typical Causes
- Electrical failures such as damaged connectors or internal PCB faults due to corrosion or water ingress.
- Pump motor wear or valve block deterioration leading to loss of ABS/ESP function or warning lights on the dashboard.
- Faults often appear as ABS/ESP warning lamp, intermittent braking faults, or poor wheel speed signal processing.
- Lifespan varies with vehicle use and environment; salt, moisture and mechanical damage shorten service life.
Replacement And Installation Notes
- Disconnect the battery and follow manufacturer safety procedures before removal.
- Remove electrical connectors and brake lines from the module; keep brake fluid contained to avoid contamination.
- Mount the replacement unit in the same orientation and torque hydraulic fittings to specification. Use new sealing washers where applicable.
- After mechanical installation, perform brake bleeding to remove air from the system.
- Electronic coding and initialization with a compatible diagnostic tool (e.g., PSA Diagbox or equivalent) is usually required to match the module to vehicle VIN and sensor configuration.
- Recommended for fitment by experienced technicians or competent DIYers familiar with brake systems and diagnostic coding.
Search Tips
Customers often search by part numbers: 0265950464, 0265235010, 9660934580, 9664148780 or internal codes 4541AF / 4541QE / 4541AG. Always confirm compatibility with your vehicle by cross-referencing these numbers and your VIN.
