ABS ESP pump Bosch Citroën Peugeot 9665106680 0265950962

Description

Hydraulic brake control block, ABS/ESP pump, ABS control unit, Bosch ABS module for Citroën C4 Picasso.

Product Overview

High-quality Bosch hydraulic ABS/ESP pump and control unit designed for Stellantis vehicles. This module manages hydraulic pressure and valve operation within the anti-lock braking and electronic stability control systems, restoring safe braking performance and stability functions. Frequently searched by part numbers, the unit is ideal for professional workshops and skilled DIY mechanics who diagnose and replace ABS hydraulic blocks.

Features And Benefits

• Complete hydraulic control block including pump, valves and electronic connector—ready to integrate with vehicle ABS/ESP systems.
• Direct replacement for vehicles using Bosch ABS modules with the listed part numbers—helps clear ABS/ESP faults and restore system functionality when the hydraulic unit is the root cause.
• Suitable for workshop repair: designed for straightforward mechanical replacement when electrical diagnostics confirm hydraulic or pump failure.
• Saves time by matching common OEM part numbers used across Stellantis platforms.

How It Works

The hydraulic block contains a high-pressure pump, a set of solenoid valves and the hydraulic circuitry that modulates brake pressure during ABS and ESP interventions. When wheel slip is detected, the module rapidly adjusts pressure at individual wheels by opening/closing valves and activating the pump to maintain vehicle stability and avoid wheel lock-up.

Typical Symptoms And Pre-Check

• ABS or ESP warning light illuminated on the dashboard.
• Unusual brake pedal behavior (pulsation, increased travel) or loss of ABS/ESP interventions.
• Audible running noise from the pump after ignition or during braking cycles.
• Stored fault codes related to pump motor, valve circuits, or hydraulic pressure sensor in the ABS control unit.
• Before replacing: check fuses, wiring harness/connectors, brake fluid level and contamination, and read fault codes with a diagnostic tool to confirm hydraulic unit fault.

How To Replace (High-Level Steps)

Replacement should be carried out by a trained technician or an experienced DIYer with appropriate tools. Steps include:

• Read and record ABS/ESP fault codes and freeze-frame data with a compatible diagnostic tool.
• Disconnect the vehicle battery before any work on the unit to avoid electrical damage.
• Drain or partially evacuate brake fluid to prevent contamination and spillage; cap brake lines immediately after disconnecting.
• Disconnect electrical connectors and carefully unfasten hydraulic lines from the module (use new sealing washers on reassembly).
• Unbolt and remove the old hydraulic unit; install the replacement, reconnect lines and connectors, and torque fasteners per manufacturer specification.
• Refill with the recommended brake fluid and perform a complete system bleed. Use diagnostic equipment to cycle the ABS pump and valves for active bleeding and to clear faults.
• Verify repair by checking for the absence of fault codes and by a road test ensuring correct ABS/ESP operation.

Installation Recommendations

• Always disconnect the battery before starting work to protect the module and vehicle electronics.
• Use new copper/steel sealing washers on banjo fittings and clean mating surfaces to avoid leaks.
• Replace contaminated brake fluid and use the fluid grade specified by the vehicle maker (typically DOT4 for most PSA/Stellantis vehicles).
• Bleed the system thoroughly and, if available, use manufacturer diagnostic routines to activate valves and the pump during bleeding.
• Observe torque settings from the repair manual and protect electrical connectors from moisture and corrosion.

Most Common Failure Causes

• Wear or seizure of the pump motor and internal valves after long service life or frequent heavy ABS interventions.
• Brake fluid contamination or moisture ingress causing corrosion and electrical/ hydraulic faults.
• Electrical issues such as corroded connectors, damaged wiring or failed control electronics within the module.
• Hydraulic leaks at pipe fittings or internal seals leading to loss of pressure and system malfunction.

Technical Information

• Manufacturer: Bosch
• Model: Citroën C4 Picasso
• Product Codes: 9665106680, 0265950962
• Other Numbers: 4541EY, 4541EZ, 4541QE

Note For Professionals

This hydraulic ABS/ESP module is a critical safety component. Proper diagnostics, careful hydraulic handling and correct bleeding/coding procedures are essential to ensure full system functionality. Replacement and final commissioning are best performed with appropriate diagnostic equipment to confirm the unit operates correctly within the vehicle network.