Description
Overview
Bosch ABS/ESP pump and electronic control unit for Citroën C5 III (X7). This combined hydraulic pump and controller manages brake pressure modulation for ABS and electronic stability programs (ESP), improving vehicle safety during emergency braking and stability interventions. The unit is commonly referenced by OE and aftermarket part numbers listed below, which are often used by repair shops and technicians when sourcing replacement parts.
Function and Benefits
The pump supplies hydraulic pressure and the integrated ECU operates solenoid valves to modulate individual wheel pressure during ABS and ESP events. Replacing a faulty unit restores proper ABS activation, ESP interventions and overall brake system stability. Compatible replacement improves safety, reduces warning lights on the dashboard and prevents limp-home conditions caused by disabled braking assistance.
Common Failure Modes and Longevity
Failures are typically caused by electrical faults in the control electronics, worn pump motor bearings, internal hydraulic leaks, contamination in the brake fluid, or corrosion from moisture ingress. There is no fixed lifespan; many units remain serviceable for 100,000+ km, while exposure to road salt, water and lack of brake fluid maintenance can accelerate failure.
Replacement Guidance (For Mechanics and Experienced DIY)
Replacing the ABS/ESP pump requires mechanical skill and appropriate tools. Typical procedure steps:
- Disconnect the negative battery terminal to prevent electrical damage.
- Scan and record ABS/ESP fault codes with a diagnostic tool before removal.
- Remove necessary trim and access panels to reach the unit.
- Carefully disconnect electrical connectors and label them if needed.
- Loosen and remove hydraulic brake lines; be prepared to catch brake fluid and avoid air ingress.
- Unbolt and remove the pump/control module assembly and fit the replacement unit.
- Reconnect hydraulic lines, torque fittings to manufacturer values and refill the brake fluid reservoir.
- Bleed the entire brake system using a proper bleeding procedure (pressure, vacuum or diagnostic-controlled bleed).
- Perform ECU initialization and ABS/ESP system calibration with a compatible diagnostic tool, then clear fault codes and road-test the vehicle.
Note: Because of system integration, successful installation usually requires bleeding and electronic calibration. If you are not equipped with the correct diagnostic tools, have the vehicle checked by a professional technician after fitment.
Technical Information
Manufacturer: Bosch
Model: Citroën C5 III (X7)
Product Codes: 9674797480, 0265951416
Other Numbers: 9674804480, 1682608880, 0265251413, 4541RY, 4541RZ, 265951416
Compatibility And Notes
Intended for Citroën C5 III (X7) models referenced by the OE numbers above. Ensure cross-reference with your vehicle VIN or workshop manual before ordering. Using the correct part number avoids fitment issues and guarantees connectors and hydraulic ports match the vehicle harness and brake lines.
If you have any doubts, provide your vehicle VIN and existing part number to confirm compatibility. Order now to restore full ABS and ESP functionality and improve braking safety on your Citroën C5 III (X7).
