The Bosch ABS ESP unit is a key part of the braking system of Citroën and Peugeot cars. It ensures the proper functioning of the anti-lock braking system (ABS) and stabilization system (ESP), which significantly increases driving safety, car stability and shortens the braking distance, especially on slippery or uneven surfaces.

This particular part is particularly suitable for Citroën C4 and Peugeot 307 cars and is often searched for by the product numbers listed below. A piece of wiring is also included, which can facilitate assembly and possible repairs to the original installation.

Technical information:
Manufacturer: Bosch / PSA
Model: ABS/ESP control module and pump (ABS ESP cube) for Citroën C4, Peugeot 307

Product codes (PSA):
9665915780
4541FV
4541FW
9661887180

Other numbers (Bosch / others):
0265950963
0265230291
1682607080

Uses and Functions:
– Ensures brake pressure regulation in the event of wheel lock-up (ABS)
– Participates in stabilizing the car in emergency situations (ESP)
– Contributes to a safer and more secure behavior of the car during braking and evasive maneuvers
– Suitable as a replacement for a faulty unit when ABS/ESP warning lights or error messages on the instrument panel are lit

Installation recommendations:
– Carry out assembly with the battery disconnected to avoid damaging the electronics.
– Before removing the old part, mark and photograph the arrangement of the brake pipes and connectors so that the connection is identical.
– Work in a clean environment, prevent dirt from entering the brake circuits.
– After installation, it is necessary to ventilate the system thoroughly and check the tightness of all connections.
– It is recommended to carry out diagnostics and possible calibration/bleeding of the ABS via a diagnostic tool according to the vehicle manufacturer’s procedure.
– After installation, perform a test drive in safe conditions and verify that the ABS/ESP warning lights are off and the system is working properly.

This part is suitable for auto mechanics and skilled home repairers who are looking for a specific Bosch ABS/ESP unit according to the original codes and want to reliably restore the function of the braking and stabilization system of their car.

High-quality Bosch ABS/ESP control module with integrated hydraulic pump, suitable for Citroën C4 and Peugeot 307 applications. This assembly is commonly referenced by product codes and is a direct-fit option when the part numbers match. Supplied with a section of wiring to simplify installation.

Function

The unit controls the anti-lock braking system (ABS) and electronic stability program (ESP)/traction functions by processing wheel speed sensor inputs and actuating the hydraulic pump and valves to modulate brake pressure. Proper operation maintains vehicle stability during hard braking and helps prevent wheel lock and loss of control.

Common Failure Modes

• Electronic faults in the control module due to moisture, corrosion or internal component failure.
• Hydraulic pump motor wear or seizure after long service life or contamination.
• Corroded or damaged electrical connectors and wiring leading to intermittent faults.
• Faults triggered by failing wheel speed sensors or wiring, which can cause the module to enter a fault state.

Replacement And Fitment Notes

The ABS/ESP unit is typically located in the engine bay, mounted near the brake master cylinder or firewall on PSA vehicles. Replacement steps (general guidance):

• Disconnect the negative battery terminal before starting work.
• Access and disconnect electrical connectors and remove any obstructing components.
• Carefully disconnect brake lines, catching fluid and preventing contamination; prepare for a full brake bleed after installation.
• Unbolt and remove the old module, install the replacement, reconnect lines and connectors, then bleed the brake system.
• Clear fault codes and, if required, perform module coding/calibration with an appropriate diagnostic tool to match the vehicle VIN and ensure full ESP/ABS functionality.

Because ABS/ESP systems are safety-critical, accurate bleeding of the brake system and verification with a diagnostic scanner are strongly recommended. Some vehicles may require professional programming or adaptation of the new unit.

Compatibility

Designed for Citroën C4 and Peugeot 307 models that use the listed part numbers. Always verify fitment by comparing product codes before purchase.

Technical Information

• Manufacturer: Bosch / PSA (Citroën, Peugeot)
• Model: Citroën C4; Peugeot 307
• Product Codes: 9663241380; 0265235235
• Additional Numbers: 9661887180; 4541Q7; 4541Q8; 4541FV

Who Should Buy

This assembly is suitable for professional auto mechanics and experienced DIY enthusiasts who are comfortable with brake system work, electrical connections and diagnostic procedures. If in doubt about coding or bleeding, consult a qualified workshop.