Audi A6 C7 Brake Caliper Wheel Brake Unit Rear Left N/S 4G0615403

Audi A6 C7 Brake Caliper Wheel Brake Unit Rear Left N/S is an original component from the Brake calipers and brackets group, designed for operation in the rear left section of the braking system. It is a robust, factory-made Audi construction that allows for precise restoration of braking efficiency while maintaining the correct geometry and operating characteristics of the system.

Specifications and technical data

• SKU: 4G0615403
• Mark: Audi
• Condition: Used
• OEM Part Number: 4G0615403
• Substitutable numbers: 4G0615403, 4G0 615 403
• Location on the vehicle: Rear, Left
• Category: Calipers & Brackets

Purpose and function in the braking system

The presented caliper is responsible for generating the clamping force of the pads against the disc on the rear left side, which has a direct impact on vehicle stability during emergency braking and the operation of assistance systems. Using a dedicated caliper for a specific axle and side of the vehicle reduces the risk of uneven brake force distribution and unwanted vibrations.

By maintaining the factory Audi design, this component works with the stock brake master cylinder, lines, and other system components, ensuring predictable performance and correct brake pedal modulation.

Construction and mounting fitment

The caliper is designed as an integral rear left wheel brake unit, which facilitates its installation in place of a worn or damaged part. The design provides proper pad guidance, adequate piston sealing, and stable mounting to the steering knuckle, which minimizes operating play and improves the consistency of braking force.

The vehicle placement defined as rear – left side allows for unambiguous identification of the mounting position, which is important when selecting parts in pairs and when planning service for the entire rear axle.

Benefits of using an original Audi caliper

Using an original caliper in an Audi A6 C7 allows for maintaining the structural integrity of the braking system, which translates into:

• stable, repeatable braking across the full range of loads,
• proper cooperation with safety systems (ESP, traction control, brake assistants),
• correct pad guidance and even wear of friction linings,
• easier diagnostics and future service thanks to maintaining the factory system architecture.

For the user, this means more predictable vehicle behavior, especially in critical situations, and a reduction in the risk of additional costs resulting from the incorrect selection of replacements.

Condition of the component and practical service application

The offered caliper is a used part, making it an attractive solution for accident repairs, restorations, or cost-optimized service while maintaining original Audi specifications. This type of component is particularly useful when it is necessary to replace a single caliper after mechanical damage or seizure.

Before installation, a standard service procedure is recommended: checking the condition of working surfaces, connection lines, and bleeding the entire system after installation. This allows for fully utilizing the design's potential and ensuring safe operation in daily driving.

If you are planning a comprehensive repair or upgrade of the braking zone in your Audi and need other elements from the same group, such as additional calipers, brackets, or mounting holders, check the available parts in the Audi brake calipers and brackets category.

Technical support and selection of used brake components

When selecting a used caliper for an Audi A6 C7, it is worth paying attention to structural compatibility, vehicle placement, and the completeness of the unit. A detailed checklist, including an assessment of the condition of guide pins, mounting sockets, and surfaces interacting with the pads, can be helpful.

To better prepare for purchasing used braking system components, such as discs, calipers, or ABS parts, it is worth using the practical tips described in the article "Second-hand braking system: how to safely select discs, calipers, and ABS?", where you will find an organized checklist helpful for assessing the condition of parts.