Description
Overview
The Bosch ABS Pump 0265800738 (also referenced by numbers 4541FF and 4541FG) is a direct-fit ABS control unit used on PSA vehicles. It combines an electronic control module with a hydraulic pump motor to modulate brake pressure and help prevent wheel lock-up during emergency braking.
Applications
Intended fitment for Citroën Berlingo II, Citroën Xsara Picasso and Peugeot Partner II. Always verify compatibility by checking the part numbers against the vehicle’s VIN and current module references before ordering.
Features And Function
- Modulates hydraulic pressure to prevent wheel lock-up and maintain directional control under heavy braking.
- Integrates electronic control unit and hydraulic pump motor in a compact assembly.
- OEM Bosch component widely used across PSA (Citroën/Peugeot) platforms.
Common Faults And Service Life
Failures commonly result from electric pump motor wear, internal valve block contamination or blockage, corrosion of hydraulic passages, leaking seals, or electrical connector issues. Service life varies by driving style and environment; many units operate beyond 100,000 km, but moisture ingress and contaminated brake fluid accelerate deterioration. Typical symptoms include illuminated ABS warning lamp, unusual brake pedal feel, loss of ABS intervention or increased stopping distances.
Replacement Guide
- Park the vehicle on level ground and disconnect the negative battery terminal to avoid electrical shorts.
- Locate the ABS unit (typically adjacent to the brake master cylinder) and protect surrounding areas from brake fluid.
- Label and carefully disconnect hydraulic brake lines, capturing expelled fluid in a suitable container.
- Unplug the electrical connectors and remove mounting bolts to free the unit from the vehicle.
- Fit the replacement unit, secure mounting bolts to manufacturer torque specifications, reconnect hydraulic lines and electrical connectors.
- Perform a complete brake bleeding procedure and clear ABS fault codes using an appropriate diagnostic tool. Road-test the vehicle to confirm correct operation.
Technical Information
- Manufacturer: Bosch
- Model: Citroën Berlingo II; Citroën Xsara Picasso; Peugeot Partner II
- Product Codes: 0265800738
- Other Numbers: 4541FF, 4541FG
