Audi A4 B9 S5 F5 Rear Brake Caliper Housing Left N/S 8W0615403B

The Left Rear Brake Caliper Body for Audi A4 B9 / S5 F5 is an original brake system component, designed for installation on the driver's side of the rear axle. Thanks to Audi's factory design, it ensures correct pad guidance, stable mounting, and predictable brake performance in everyday use.

Specifications and technical data

• SKU: 8W0615403B-1
• Mark: Audi
• Condition: Used
• OEM Part Number: 8W0615403B
• Substitutable numbers: 8W0615403B, 8W0 615 403 B
• Location on the vehicle: Rear, Left
• Part type: Brake Caliper
• Category: Calipers & Brackets

Vehicle Application and Placement

The presented caliper body belongs to the Brake Calipers and Brackets group and is dedicated for installation on the rear axle, on the left side of the vehicle. This placement is crucial for maintaining the correct brake system geometry, proper pad guidance, and even distribution of braking forces between the left and right sides.

The component has been specifically designed with the suspension and brake construction of Audi models in mind, which translates to:

• correct positioning relative to the brake disc,
• stable mounting to the steering knuckle or control arm,
• compatibility with factory guides and mounting elements.

Original Origin and Audi Compatibility

The caliper body comes from the Audi production line, meaning it is a part compliant with the manufacturer's factory standards. In practice, this means maintaining the same mounting parameters, geometry, and casting quality as intended in the brake system design for Audi A4 B9 and S5 F5.

Thanks to this, no adaptations, modifications, or additional shims are required during replacement – the caliper body works with original brake system components, simplifying the mechanic's work and reducing the risk of installation errors.

Characteristics of a Used Component

This is a used part, sourced from disassembly, which allows for combining original Audi quality with a more favorable repair cost. The caliper body retains its load-bearing and structural function, serving as a solid base for further brake system servicing (e.g., caliper refurbishment, seal or piston replacement, if required for the specific vehicle).

Choosing an original, used caliper body is particularly beneficial where precise fitment with other brake components and material durability are important, and the car owner wants to avoid the compromises typical of the cheapest aftermarket alternatives.

Benefits of Using an Original Caliper Body

Using this component in an Audi A4 B9 or S5 F5 allows for restoring the correct operation of the left rear brake caliper, which translates to:

• stable pad guidance and even wear of brake pads,
• correct caliper positioning relative to the disc,
• maintenance of factory braking parameters on the rear axle,
• easier diagnostics and future servicing due to compliance with manufacturer documentation.

For workshops and users, this means predictable installation, no fitting issues, and the ability to maintain the brake system in a configuration consistent with Audi's design.

Expanding the Audi Braking System

If you are planning a comprehensive repair or upgrade of the braking area in your Audi and need other components from the same group, such as additional caliper bodies, brackets, or mounting holders, check the available parts in the Audi Brake Calipers and Brackets category.

Technical Support and Selection of Used Calipers

When working with used brake system components, it is advisable to rely on proven service procedures and reliable technical knowledge. To better understand how to safely use original salvaged parts, how to assess their condition, and how to optimize repair costs, read the article: Brake Calipers Under the Microscope: How to Effectively Reduce Brake System Repair Costs by Choosing Proven Salvaged Parts.