Description
Overview
A genuine-style Bosch ABS control module and hydraulic pump assembly, supplied with common PSA part references. This unit manages anti-lock braking functions by combining the electronic control unit with the hydraulic pump to modulate brake pressure during slip events. It is a frequently searched component for Citroën Xsara Picasso repairs and maintenance, often referenced by its part numbers for quick identification.
Why This Part Matters
The ABS control module is a safety-critical component that prevents wheel lock-up under heavy braking and helps maintain vehicle stability. For garages and skilled DIY technicians, replacing a faulty module restores ABS functionality, eliminates warning lights, and ensures safe braking performance under varied road conditions.
Common Symptoms And Failure Causes
- ABS warning light illuminated on the dashboard
- Intermittent or permanent loss of ABS function
- Unusual pump noise or continuous pump operation
- Corrosion, water ingress or electrical connector faults leading to module failure
- Damage after collision or hydraulic line failure
Failures are most commonly caused by moisture ingress, corrosion of electrical contacts, internal pump motor wear, or wiring harness damage. In many cases the hydraulic unit remains serviceable but the electronic control requires replacement or reprogramming.
Replacement And Installation Guidance
Intended for professional installation or experienced DIY mechanics. Typical replacement steps include:
- Park on level ground, secure the vehicle and disconnect the negative battery terminal to avoid short circuits.
- Locate the ABS hydraulic unit (commonly mounted near the brake master cylinder in the engine bay).
- Depressurize the brake system and be prepared to capture brake fluid; remove electrical connectors and carefully undo the hydraulic lines using appropriate line wrenches.
- Unbolt the unit from its mounting bracket and remove the assembly. Compare part numbers before fitting the replacement.
- Install the new module, torque fasteners to manufacturer recommendations, reconnect hydraulic lines and electrical connectors, then refill and bleed the brake system thoroughly.
- Note: The replacement unit may require vehicle-specific coding or pairing with a diagnostic tool to clear faults and enable proper ABS operation. After installation, perform a full diagnostic scan and road test to confirm correct function.
Fitment Notes
This unit is specified for Citroën Xsara Picasso applications and compatible PSA models that use the listed part numbers. Buyers often search by product code, so check the numbers below against your existing part before ordering.
Technical Information
- Manufacturer: Bosch
- Model: Citroën Xsara Picasso (PSA applications)
- Product Codes: 0273004353, 0265216642, 9633666580
- Other Numbers: 454150 (additional reference)
For Mechanics And DIY Enthusiasts
Whether you service multiple vehicles in a workshop or prefer to repair your own car, this Bosch ABS control module provides a direct-replacement option referenced by common PSA part numbers. Ensure you have access to a suitable diagnostic tool for coding and a proper brake-bleeding setup to complete the job safely.
If you are unsure about fitment or the need for module coding, consult a qualified technician or provide your vehicle VIN to verify compatibility before purchase. Order now to get fast identification by part number and professional-grade replacement for Citroën Xsara Picasso ABS faults.
