Designed for professional mechanics and DIY enthusiasts, this Bosch ABS control module and hydraulic pump for Citroën Xsara Picasso is a direct replacement for PSA vehicles. Supplied under part numbers 0273004353 / 0265216642 / 9633666580 / 454150, this ABS unit integrates the electronic control unit and hydraulic modulator to manage wheel slip and braking stability.

Function And Benefits

The ABS module monitors wheel speed sensors and modulates brake pressure via its hydraulic pump and valves to prevent wheel lock-up during hard braking. Fitting an OEM Bosch unit restores reliable anti-lock braking performance, improves vehicle safety, and ensures compatibility with vehicle stability systems where applicable.

Common Faults And Symptoms

Typical failure modes include electrical faults such as corroded connectors or failed internal relays, hydraulic problems like leaking valves or a worn pump, and sensor-related errors that trigger warning lights. Symptoms include an illuminated ABS or ESP warning light, unusual brake pedal feedback, or diminished ABS responsiveness.

Replacement Notes

Replacement generally involves isolating the battery, accessing the ABS unit (wheel arch liner or engine bay), disconnecting electrical connectors and brake lines, unbolting the module, installing the replacement, and refilling and bleeding the brake system. Some vehicles may require ABS coding, calibration, or a diagnostic scan to clear faults and ensure full integration.

Compatibility

Typically used on Citroën Xsara Picasso models and compatible PSA vehicles that list the above part numbers. Always verify compatibility by matching OEM part numbers or consulting the vehicle’s VIN and an official parts catalog before purchase.

Technical Information

• Manufacturer: Bosch
• Model: Citroën Xsara Picasso
• Product Codes: 0273004353, 0265216642
• Other Numbers: 9633666580, 454150

High-quality ABS/ESP control unit designed for Citroën Xsara Picasso models. This Bosch-manufactured hydraulic and electronic module integrates the ABS pump, modulator and ECU to manage braking pressure and vehicle stability. Frequently searched by product codes 0265950072 and 4541C8, it is a common replacement part for PSA group vehicles.

Features & Function

The ABS/ESP unit prevents wheel lock-up during braking and supports electronic stability control interventions. It monitors wheel speed sensors and controls hydraulic valves via an electric pump and electronic control logic to modulate brake pressure on individual wheels for safety and stability.

Common Faults And Lifespan

Typical failure causes include electrical faults, corrosion, water ingress, worn pump motor or internal valve faults. Lifespan varies with use and environment; units commonly require replacement after around 10–15 years or sooner if exposed to contamination, collision damage or persistent moisture.

Replacement & Installation

Overview for mechanics and experienced DIYers: diagnose the fault with an OBD/ABS scanner, disconnect the vehicle battery, safely lift the vehicle and remove protective covers to access the unit. Unplug electrical connectors and unbolt the module; remove brake lines carefully to contain fluid. Install the replacement unit, refill and bleed the brake system, and perform ECU coding/initialization with a diagnostic tool. Because this work involves brake hydraulics and electronic coding, professional installation is recommended if you are not experienced.

Compatibility

Direct fit for Citroën Xsara Picasso models within the PSA group that use part numbers 0265950072 / 265950072 and reference 4541C8. Always verify the part number, connector type and ABS module appearance before purchasing to ensure compatibility.

Technical Information

Manufacturer: Bosch

Model: Citroën Xsara Picasso (PSA Group)

Product Codes: 0265950072, 265950072

Additional Numbers: 4541C8

Key Features

• Direct-fit replacement for Citroën and Peugeot models listed below.
• OEM Product Code: 0265800738 with cross-references 4541FF and 4541FG.
• Integrated hydraulic pump motor and valve block to regulate braking pressure under ABS control.
• Restores ABS operation, reduces stopping distance under emergency braking and improves vehicle stability.

Fitment & Compatibility

Compatible with a range of PSA models, most commonly found on Citroën Berlingo II, Citroën Xsara Picasso and Peugeot Partner II variants. Always verify the product code against the vehicle’s VIN or the old unit before ordering. This part is typically searched by its product numbers 0265800738, 4541FF or 4541FG.

Installation & Maintenance

• Disconnect the negative battery terminal before starting to avoid electrical damage.
• Locate the ABS unit (usually mounted in the engine bay near the brake master cylinder or inner fender area).
• Depressurise the brake system, then carefully disconnect the electrical connector and brake lines. Mark the lines to avoid interchange.
• Unbolt the unit from its bracket and remove. Fit the replacement, torque mounting bolts to manufacturer specification and reconnect lines and connector.
• Refill the braking system with the correct DOT fluid, perform a full pressure bleed of all brake circuits and the ABS hydraulic circuit.
• Clear ABS fault codes and run ABS system initialization or adaptation using a diagnostic scanner. The ABS lamp may remain on until codes are cleared and the system is bled and adapted.

Causes Of Failure & Service Life

ABS pumps can fail for multiple reasons: electrical motor wear, internal valve or piston seizure, contamination in the hydraulic system, corroded connectors, or water ingress. Lifespan varies with vehicle use and environment; many units remain serviceable beyond 100,000 km, but failures can occur earlier, especially if brake fluid maintenance has been neglected.

Practical Tips

• Always replace brake fluid when changing the ABS pump to prevent contamination-related failures.
• Inspect electrical connectors and wiring harness for corrosion before installation.
• Use a compatible diagnostic tool to clear codes and confirm pump operation after replacement.

Technical Information

• Manufacturer: Bosch
• Model: ABS Pump / Control Module
• Product Codes: 0265800738
• Additional Numbers: 4541FF, 4541FG