Audi A6 C6 ABS ESP Pump Hydraulic Block Control Unit 4F0910517AK 4F0614517BF

The Audi A6 C6 Brake Master Cylinder ABS ESP is a component from the ABS Control Units category, designed for advanced control of the anti-lock braking and electronic stability systems in Audi vehicles. This is a used, fully functional module that allows for the restoration of correct ABS and ESP operation, ensuring predictable vehicle behavior during braking and emergency maneuvers. Thanks to its factory OEM construction, you maintain compatibility with the original braking system architecture.

Specifications and technical data

• SKU: 4F0910517AK
• Mark: Audi
• Condition: Used
• OEM Part Number: 4F0910517AK
• Substitutable numbers: 4F0910517AK, 4F0 910 517 AK, 4F0614517BF, 4F0 614 517 BF, 0265251590
• Category: ABS Control Modules

Function and Role in the Braking System

The presented brake master cylinder integrated with the ABS/ESP control unit is responsible for precise pressure modulation in the brake circuits and dynamic adjustment of braking force to individual wheels. In practice, this means:

• effective prevention of wheel lock-up during hard braking,
• stabilization of the vehicle's path when traction is lost,
• coordination of the braking system with the traction control system,
• maintenance of factory safety parameters designed for the Audi A6 C6.

By using an original control unit, the system retains its proper operating characteristics, and intervention in the electrical and hydraulic systems is limited to the essential minimum.

Compatibility and OEM Identification

The master cylinder has been specifically designed for the Audi platform, which facilitates part selection by OEM number and interchangeable part numbers. The use of the correct ABS/ESP control unit is crucial for proper communication with the vehicle's electronics, including the engine module, traction control system, and electronic stability program. Selection by part number helps avoid communication issues over the CAN bus, control unit errors, and incorrect operation of driver assistance systems.

If you have doubts about selecting the correct part, it is advisable to compare the markings on the removed component and verify compatibility with the vehicle's service documentation. A used OEM part offers a reasonable compromise between repair cost and maintaining the original functionality of the braking system.

Condition, Installation, and Service Aspects

The offered ABS/ESP master cylinder is a used component intended for installation in place of the factory module in the Audi A6 C6. During replacement, it is recommended to:

• thoroughly bleed the braking system using appropriate service procedures,
• check the tightness of brake lines and electrical connectors,
• perform computer diagnostics to clear error codes and adapt the control unit,
• verify the correct operation of ABS and ESP during a test drive.

Professional installation and post-installation diagnostics allow for the full utilization of the control unit's capabilities and ensure stable, predictable operation of the braking system in daily use.

Safety and Selection of Used Braking System Components

For critical components like the ABS/ESP brake master cylinder, a conscious approach to purchasing used parts is particularly important. It is worth paying attention to the conformity of markings, the origin of the component, and the condition of hydraulic and electrical connectors. To streamline the verification process, a comprehensive checklist for selecting used braking system components is a good reference point – you can find it in the article Used Braking System: How to Safely Choose Discs, Calipers, and ABS?, which discusses the most important technical and operational aspects step by step.

Expanding ABS System Modernization in Audi

If you are planning a comprehensive repair or modernization of the braking area in your Audi and need other components from the same group, such as additional control modules, pumps, or ABS electronic units, check the available parts in the Audi ABS Control Units category.

By using consistent components from the same functional group, you will maintain uniform system operating parameters, which translates to predictable vehicle behavior in emergency situations and easier future diagnostics.