Audi RS4 B8 Brake Caliper Rear Left N/S Wheel Braking Unit RS 8K0615403D

Audi RS4 B8 Brake Caliper Rear Left N/S Wheel Braking Unit RS is an original braking system component from the Brake calipers and brackets group, designed for installation on the rear left axle. This used OEM component ensures a proper fit for the RS4 B8 design and stable braking system performance under both daily and dynamic driving conditions. It is a solution for users looking for a technically verified, branded component at a reasonable price.

Specifications and technical data

• SKU: 8K0615403D
• Mark: Audi
• Condition: Used
• OEM Part Number: 8K0615403D
• Substitutable numbers: 8K0615403D, 8K0 615 403 D
• Location on the vehicle: Rear, Left
• Category: Calipers & Brackets

Purpose and vehicle placement

The presented caliper is dedicated for installation on the rear left side of the vehicle, which is crucial for the correct distribution of braking forces in the Audi RS4 B8. Using the correct caliper at this point of the braking system allows for maintaining factory performance parameters, including vehicle stability during intense braking and proper cooperation with safety systems.

Its original Audi origin promotes precise fitting with the carrier, disc, and other system elements, reducing the risk of installation issues and premature wear.

Benefits of using an original Audi caliper

Choosing an original brake caliper for the RS4 B8 translates into a number of practical benefits:

• maintaining the factory braking characteristics of the rear axle,
• secure fitment to the standard braking system geometry,
• consistency with other system elements, such as discs and pads,
• easier diagnostics and maintenance due to compliance with manufacturer documentation.

For users who drive their RS4 B8 more dynamically, using an original caliper on the rear left axle helps maintain predictable vehicle behavior when braking from higher speeds.

Characteristics of the used component

The offered caliper comes from the used OEM parts segment, which allows for a significant reduction in repair costs compared to a brand-new component, while maintaining the design intended by the vehicle manufacturer. This type of solution is particularly beneficial for comprehensive work on the rear axle, where several components are often replaced simultaneously.

To better plan your repair and make an informed choice when selecting a used component, it is worth checking out the guide on our blog: Brake calipers under the microscope: How to effectively reduce braking system repair costs by choosing verified recycled parts. The article explains what to look for when selecting used calipers and how to safely optimize your service budget.

Support for RS4 B8 upgrades and repairs

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

For broader renovation or modernization projects, especially for cars from model years similar to the RS4 B8, inspiration and practical tips can also be found in our blog post: The second life of a youngtimer – how used car parts rejuvenate cars from 1998–2012. There, you will find examples of upgrade scenarios using branded recycled parts.

Summary

Audi RS4 B8 Brake Caliper Rear Left N/S Wheel Braking Unit RS is a technically matched, original braking system component designed for installation on the rear left axle. Choosing a used OEM caliper allows you to combine cost control with maintaining the proper braking characteristics, which is important for both safety and the durability of the entire system.