Audi A5 S5 Q5 Sportback S4 B9 Brake Caliper Rear Left N/S Braking 8W0615403H

Audi A5 S5 Q5 Sportback S4 B9 Brake Caliper Rear Left N/S is an original component from the Brake calipers and carriers group, designed for installation on the rear axle on the driver's side. This used OEM component ensures a proper fit for the Audi braking system, maintaining factory mounting geometry and correct interaction with other system elements.

Specifications and technical data

• SKU: 8W0615403H
• Mark: Audi
• Condition: Used
• OEM Part Number: 8W0615403H
• Substitutable numbers: 8W0615403H, 8W0 615 403 H
• Location on the vehicle: Rear, Left
• Category: Calipers & Brackets

Purpose and vehicle placement

The presented caliper is designed to operate on the rear left side of the vehicle, which is crucial for the correct distribution of braking force and vehicle stability during emergency braking. The dedicated placement eliminates the risk of incorrect installation, and the design, consistent with the factory Audi project, supports proper interaction with the brake disc, pads, and brake line.

This element is particularly important in high-performance cars, such as S versions and models with all-wheel drive, where the braking system operates under higher thermal and mechanical loads.

Construction and technical characteristics

The caliper belongs to the Brake calipers and carriers group, meaning it is responsible for the precise guidance of brake pads relative to the disc and the stable transfer of force from the hydraulic system to the friction elements. The design provided by the vehicle manufacturer ensures:

• adequate body rigidity, limiting deflection under high operating pressure,
• correct positioning of the pads relative to the disc's working surface,
• compatibility with factory carriers and mounts on the rear left axle.

Thanks to the use of an original Audi solution, the consistency of the entire braking system is maintained, which translates into predictable vehicle behavior and repeatable braking parameters.

Benefits of using an original Audi caliper

Choosing a used, original Audi caliper brings a number of practical advantages compared to random replacements of unknown origin. The most important include:

• Factory fit – maintaining the original geometry, bolt spacing, and mounting points, which facilitates installation and minimizes the risk of leaks or improper operation.
• Braking system consistency – predictable interaction with brake discs, pads, and brake lines intended for a given Audi model.
• Stable operating parameters – a design developed by the vehicle manufacturer in terms of weight, performance, and the characteristics of a specific model platform.

For users who expect repeatable, safe operation of the braking system, the use of an original caliper is a technically justified and economically advantageous solution in the used parts segment.

Selection, installation, and operational safety

Before installation, it is recommended to verify the compatibility of the caliper with the specific engine version and equipment of the vehicle, as well as to check the condition of cooperating elements – discs, pads, and lines. A correctly selected and installed caliper on the rear left side:

• supports even distribution of braking force between the axles and sides of the vehicle,
• reduces the risk of the car pulling during braking,
• ensures stable operation of auxiliary systems, such as ABS or traction control (if present in the given unit).

In the case of installing a used component, it is particularly important to carry out a professional inspection and bleed the braking system in accordance with the vehicle manufacturer's service procedures.

Technical support and additional information

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, mounting carriers, or guide brackets, check the available parts in the Audi brake calipers and carriers category.

When selecting used braking system components, it is worth following a proven procedure for assessing technical condition and compatibility. A detailed list of control steps and practical tips can be found in the article Second-hand braking system: how to safely select discs, calipers, and ABS?, which helps to consciously plan the purchase and installation of such components.