Audi A4 B9 Rear Brake Disc Left Right N/O/S 300X12mm Set Kit 8W0615601C

Audi A4 B9 Rear Brake Disc Left Right N/O/S 300X12mm Set Kit is an original set designed for the left and right side of the rear axle, intended for a braking system with a 300x12 mm working diameter. Thanks to its factory origin from Audi, this component ensures consistency with the brake system design and predictable braking behavior, which is important for both daily driving and more dynamic use.

Specifications and technical data

• SKU: 8W0615601C
• Mark: Audi
• Condition: Used
• OEM Part Number: 8W0615601C
• Substitutable numbers: 8W0615601C, 8W0 615 601 C
• Location on the vehicle: Rear, Right, Left
• Category: Brake Disc Rotors

Purpose and vehicle placement

The presented set consists of rear brake discs designed for installation on the left and right side of the rear axle in an Audi A4 B9 generation. The kit is designed to work with the factory caliper and brake pads, which facilitates service and reduces the risk of fitment issues. Replacing both sides simultaneously allows for maintaining uniform braking efficiency and vehicle stability during intense deceleration.

Kit construction and operating parameters

The set includes two rear discs with a working diameter of 300x12 mm, which corresponds to the factory configuration used in selected Audi A4 B9 versions. This dimension provides an adequate friction surface for the brake pads while maintaining the proper unsprung mass of the rear axle. The use of the original disc geometry promotes even heat distribution during braking and reduces the risk of steering wheel vibrations or brake pedal pulsation.

Original origin and installation benefits

As an item from the Brake discs group prepared by Audi, the set maintains the factory dimensional tolerances and operating characteristics intended by the vehicle manufacturer. This means:

• secure fitment to the hub and caliper without the need for modifications,
• correct positioning relative to the brake pads,
• maintenance of factory braking efficiency parameters in the rear axle.

As a result, the installation process is predictable, and the mechanic can focus on properly preparing the contact surfaces and the bedding-in procedure, rather than correcting dimensional inaccuracies.

Performance characteristics of the used part

The item is offered as a used part, which allows for significantly reducing the cost of brake system maintenance while maintaining the original origin of the component. In practice, this represents an attractive compromise between price and compliance with Audi's factory specifications. Discs of this type are often chosen for repairs of fleet or private vehicles, where a rational service budget is important while maintaining consistency with the manufacturer's design.

Optimizing brake system service costs

When planning work on the brake system, it is worth considering not only the discs themselves but also the condition of the calipers, guide pins, and pads. The proper approach to selecting reclaimed components is described in an article dedicated to the regeneration and replacement of brake components – more practical tips can be found in the material Brake calipers under the microscope – how to reduce brake system repair costs.

Expanding Audi brake system upgrades

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 disc sets, compatible brake pads, or supplementary brake lines, check the available parts in the Audi brake discs category.

For drivers who want to complete a wider set of original used components in one place – from brake system elements to other vehicle subassemblies – the One-Stop-Shop shopping guide, available in the article how to effectively complete used car parts in one place, may be helpful.