Overview

This Bosch hydraulic control block and ABS/ESP pump is a direct-fit safety module designed for Citroën C4 Picasso vehicles. It controls hydraulic pressure to the braking circuits during ABS and ESP interventions, ensuring stable braking performance and vehicle stability under emergency braking or low-traction conditions. The unit is offered with common OEM reference numbers used by Stellantis and Bosch, making it an ideal replacement for workshops and experienced DIY technicians looking for reliable ABS/ESP components.

Key Benefits

• Direct replacement for original ABS/ESP modules specified for Citroën C4 Picasso.
• Restores ABS and Electronic Stability Program functionality when the original pump or hydraulic block fails.
• Includes common OEM numbers in listings for easier lookup and ordering.
• Suitable for professional garages and competent DIY mechanics who can perform safe brake system work and electronic coding where required.

How It Works

The hydraulic control block houses solenoid valves, pressure modulators and an electric pump motor. During an ABS event, wheel speed sensors signal the control electronics to modulate brake pressure via the valve block and pump to prevent wheel lock. ESP interventions use the same hydraulic network to selectively apply brakes and maintain vehicle stability. A fault in any electrical connector, pump motor, valve or internal electronics can disable ABS/ESP functionality and trigger warning lights.

How To Replace

Replacement requires basic mechanical skills and attention to brake-system procedures. Typical steps:

• Park vehicle securely and relieve system pressure.
• Disconnect the negative battery terminal to avoid short circuits and accidental airbag/ECU events.
• Access the ABS unit (usually located in the engine bay near the master cylinder).
• Disconnect the electrical connector and carefully undo hydraulic lines using appropriate flare-nut tools; cap or plug lines to prevent contamination and fluid loss.
• Unbolt the assembly and remove the unit. Transfer any brackets or brackets studs if required by the replacement part.
• Install the new unit, reconnect hydraulic lines and electrical connector, torque fasteners to manufacturer specification where available.
• Bleed the brake system thoroughly. Use a diagnostic tool to run ABS pump activation cycles and perform an electronic bleed if supported. Clear fault codes and confirm correct operation.

Installation Recommendations

• Manufacturer: Bosch components are sensitive to contamination. Use only clean, manufacturer-recommended brake fluid and avoid introducing dirt into the hydraulic circuit.
• Bleeding: After installation perform a complete brake bleed. Preferably use a scan tool to command the ABS pump and valves during bleeding to ensure trapped air is removed from the hydraulic block.
• Electrical Checks: Inspect connector pins and wiring harness for corrosion or damage before reconnecting.
• Safety: Always support the vehicle securely and wear appropriate PPE. Follow vehicle manufacturer procedures for handling brake fluid and for disposal of used fluid.

Why The Part Most Commonly Fails

Common failure causes include electric motor wear on the pump, internal valve sticking, contamination from degraded or contaminated brake fluid, corrosion in hydraulic passages, and electrical connector faults. Long service life combined with exposure to moisture and contaminated fluid increases the likelihood of valve and motor failures. In some cases, repeated ABS activation due to faulty wheel speed sensors can accelerate wear.

Technical Information

• Manufacturer: Bosch / Stellantis (Citroën)
• Model: Citroën C4 Picasso
• Product Codes: 9666199180, 0265951253
• Additional Numbers: 4541JH, 4541JJ, 4541QE, 265951253

Notes For Professionals

Inspect surrounding components such as master cylinder, brake lines and wheel speed sensors when replacing the ABS hydraulic block. Residual contamination or unrelated faults may cause recurrent warning lights after replacement. When possible, use diagnostic equipment to verify proper communication between the ABS module and the vehicle CAN network and to confirm the absence of stored fault codes after installation.

Who Should Fit This Part

Recommended for professional workshops and experienced DIY mechanics comfortable with brake hydraulics and electronic diagnostics. If you are unsure about bleeding procedures or electronic checks, seek assistance from a qualified technician to ensure safe and reliable braking performance.

Overview

This Bosch ABS/ESP hydraulic control unit is a direct-fit module designed for Citroën C4 Picasso models. It combines the high-pressure pump, hydraulic block and electronic control functions that manage ABS and Electronic Stability Program interventions. Supplied with original part numbers commonly used when searching for replacements, this unit is suitable for workshops and DIY mechanics who need a reliable replacement to restore braking stability and ABS functionality.

Key Features

• Integrated Hydraulic Block And Pump: Controls brake pressure modulation during ABS and ESP events.
• Bosch Technology: Robust valve and motor design used on Stellantis platforms.
• Direct Replacement: Matches original mounting points and electrical connectors for Citroën C4 Picasso.
• Ideal For Repairs After Pump Or Valve Failure: Restores proper ABS/ESP operation when the hydraulic unit is defective.

Technical Information

• Manufacturer: Bosch
• Model: Citroën C4 Picasso
• Product Codes: 9665106680, 0265950962, 265950962
• Additional Numbers: 4541EY, 4541EZ, 4541QE
• Origin: Unit Removed From Vehicle With Automated (Robotic) Gearbox

Symptoms Indicating Replacement Is Needed

• ABS Or ESP Warning Light Illuminated On Dashboard.
• Intermittent Or Continuous ABS Pump Noise Under Braking.
• Reduced Brake Pedal Feel, Pulsation Or Unusual Brake Behavior During Emergency Braking.
• Frequent Or Unexplained Activation Of The Pump During Normal Driving.

Most Common Causes Of Failure

• Contaminated Or Moisture-Laden Brake Fluid Causing Corrosion Inside The Hydraulic Block.
• Electrical Faults – Corroded Connectors Or Failed Motor/Valves.
• Thermal Stress And Wear After High Mileage Or Heavy Use.
• Related Sensor Failures (Wheel Speed Sensors) Causing Excessive Pump Operation And Premature Wear.

Installation Recommendations

Before Work: Always Disconnect The Battery And Follow Manufacturer Safety Procedures To Avoid Damage To Electronic Systems. Work Should Be Performed By A Qualified Mechanic Or Experienced DIY Technician.

Replacement Steps (General Guideline):

1. Park Vehicle Safely, Chock Wheels And Disconnect Negative Battery Terminal.
2. Access The ABS/ESP Unit (Often Located In Engine Bay) And Carefully Disconnect Electrical Connectors.
3. Cap Brake Lines Immediately After Disconnection To Minimize Fluid Loss And Contamination.
4. Unbolt The Hydraulic Unit From Its Mounting Carrier And Remove It From The Vehicle.
5. Install Replacement Unit, Reconnect Brake Lines And Electrical Connectors, Respecting Manufacturer Torque Values For Line Fittings.
6. Refill Brake Fluid With Correct Specified Fluid And Bleed The Brake System Thoroughly. Use A Diagnostic Tool To Activate The Pump And Perform The Automatic Bleeding Procedure If Available.
7. Clear Fault Codes And Verify Proper Operation Of ABS/ESP Systems During A Road Test.

Additional Recommendations: Replace Brake Fluid And Inspect Wheel Speed Sensors And Wiring While Replacing The Unit. Ensure All Connectors Are Clean And Corrosion-Free.

Notes On Coding And Initialization

After Replacement It May Be Necessary To Perform Initialization Or ABS Self-Tests Using A Compatible Diagnostic Tool. Some Vehicles Require Module Adaptation Or System Bleeding Sequences That Are Best Performed With Manufacturer-Level Equipment.

Why Choose This Part

Part Numbers And OEM Cross-References Included Above Make This Unit Easy To Find For Mechanics Searching By Code. The Bosch Hydraulic Block Is A Common Service Replacement For Citroën C4 Picasso Vehicles And Restores Critical ABS/ESP Safety Functions When The Original Unit Fails.

If you are looking for a reliable and quality part to repair your Citroën or Peugeot brake system, this used Bosch ABS ESP pump restores your vehicle’s original function and enhances safety. Carefully removed from a Citroën C4 Picasso, it offers an economical yet effective solution for your brake maintenance needs.

Technical Information:

• Manufacturer: Bosch
• Model: Citroën C4 Picasso
• Product Codes: 9667055780, 0265951427
• Additional Numbers: 4541HG, 4541HH, 4541QE

This ABS ESP module plays a vital role in maintaining vehicle stability and traction during braking, especially under adverse driving conditions. The pump and control unit are engineered to provide maximum protection and driving comfort, crucial for your safety on the road.

Ideal for professional mechanics and experienced DIY enthusiasts, this part is ready for immediate installation. Proper installation and maintenance are essential for the long-term performance and safety of your braking system.

Take advantage of this offer to restore the reliability and safety of your Citroën C4 Picasso with this proven Bosch ABS ESP pump. Your vehicle deserves the best care, and you deserve peace of mind while driving.

Looking for a reliable replacement part for your Citroën C4 Picasso? This Bosch ABS ESP Pump is engineered to deliver optimal performance and safety for your vehicle. The pump is an essential component of the braking system, ensuring proper function of both ABS (Anti-lock Braking System) and ESP (Electronic Stability Program), which are critical for maintaining vehicle control during emergency braking or slippery conditions.

This product includes the ABS ESP pump and the integrated control unit, commonly known as the Bosch “cube,” guaranteeing quality and reliability. Additionally, the package features a section of wiring harness, simplifying installation into your vehicle. By installing this part, you restore the original braking system performance and improve overall vehicle safety.

Technical Information

• Manufacturer: Bosch
• Model: Citroën C4 Picasso
• Product Codes: 9666040380, 0265951121
• Additional Numbers: 4541HG, 4541HH, 4541QE

The ABS ESP pump plays a vital role in maintaining vehicle stability and drivability during sudden braking, even on slippery or uneven surfaces. Designed specifically for Citroën C4 Picasso models, this part from original manufacturer Bosch ensures compatibility and seamless integration into your existing system.

Offering exceptional value at a low price for a high-quality component, this pump—when correctly installed and maintained—will extend your vehicle’s lifespan significantly. For installation assistance or further information, consult your auto mechanic or contact us directly.

Shop with confidence in our expertise and quality. This pump module is the ideal choice to guarantee satisfaction and safety on the road.

Technical Information

• Manufacturer: Bosch (originally supplied for PSA – Citroën / Peugeot)
• Model: Citroën C4 Grand Picasso (example fitment: 2008). Verify with VIN and part numbers before purchase.
• Product Codes: 0265950464, 0265235010, 9660934580, 9664148780
• Additional Numbers: 4541AF, 4541QE, 4541AG

Function And Application

The unit controls ABS and ESP by monitoring wheel speed sensors and modulating hydraulic pressure via the integrated pump and valves. It prevents wheel lock during braking and assists vehicle stability under adverse conditions. It is a key safety component in modern braking systems and must match vehicle electronic configuration.

Common Faults And Typical Causes

• Electrical failures such as damaged connectors or internal PCB faults due to corrosion or water ingress.
• Pump motor wear or valve block deterioration leading to loss of ABS/ESP function or warning lights on the dashboard.
• Faults often appear as ABS/ESP warning lamp, intermittent braking faults, or poor wheel speed signal processing.
• Lifespan varies with vehicle use and environment; salt, moisture and mechanical damage shorten service life.

Replacement And Installation Notes

• Disconnect the battery and follow manufacturer safety procedures before removal.
• Remove electrical connectors and brake lines from the module; keep brake fluid contained to avoid contamination.
• Mount the replacement unit in the same orientation and torque hydraulic fittings to specification. Use new sealing washers where applicable.
• After mechanical installation, perform brake bleeding to remove air from the system.
• Electronic coding and initialization with a compatible diagnostic tool (e.g., PSA Diagbox or equivalent) is usually required to match the module to vehicle VIN and sensor configuration.
• Recommended for fitment by experienced technicians or competent DIYers familiar with brake systems and diagnostic coding.

Search Tips

Customers often search by part numbers: 0265950464, 0265235010, 9660934580, 9664148780 or internal codes 4541AF / 4541QE / 4541AG. Always confirm compatibility with your vehicle by cross-referencing these numbers and your VIN.