Audi S4 B9 S5 F5 Front Brake Caliper Housing 375x36mm Right O/S 8W0615108AJ

Visual condition of the part

The product shows signs of use visible in the photos. Audi S4 B9 S5 F5 Front Brake Caliper Housing 375x36mm Right O/S for 375x36 mm brake discs is a robust, performance-oriented brake system component designed for the front axle on the passenger side (Right O/S). The distinctive red finish emphasizes the dynamic character of the S4 and S5 models, while the OEM construction ensures a perfect fit for the factory brake system. It is a practical choice for replacing a damaged caliper or restoring the full efficiency of the stock braking set.

Specifications and technical data

• SKU: 8W0615108AJ-1
• Mark: Audi
• Condition: Used
• OEM Part Number: 8W0615108AJ
• Substitutable numbers: 8W0615108AJ, 8W0 615 108 AJ, 8W0615106ES, 8W0 615 106 ES
• Location on the vehicle: Front, Right
• Part type: Brake Caliper
• Color: Red
• Category: Calipers & Brackets

Purpose and fitment

This item is a front brake caliper designed for the right side of the vehicle, compatible with a 375 mm diameter and 36 mm thick brake disc. This disc size is typical for the more powerful brake system versions in the Audi S4 B9 and S5 F5, which translates into stable, consistent braking at higher speeds and during intensive use. As part of the Brake Calipers and Carriers group, this component is engineered for specific mounting points on the steering knuckle and the correct geometry relative to the disc, which facilitates installation and reduces the risk of issues with pad alignment or uneven wear.

Construction and technical characteristics

The caliper was designed as an OEM component for the Audi brand, which means it maintains factory performance parameters, such as clamping force, pressure distribution on the pad, and compatibility with the stock brake master cylinder and ABS/ESP system. The design intended for use with the large 375x36 mm disc ensures adequate body rigidity, which limits deflection during heavy braking. The red color of the housing serves not only an aesthetic function but also allows for quick visual verification of the caliper's condition behind the wheel, which is helpful during service inspections and checking for potential leaks or uneven pad wear.

Condition, application, and benefits of installation

The item is offered as a used brake caliper, which allows for an economical repair of the brake system while maintaining the original Audi specification. This type of component is particularly useful in situations where there has been mechanical damage to the caliper, seized guide pins, or a need to replace the housing after a collision. Replacing it with an original caliper with the correct disc diameter and proper vehicle placement helps to:

• maintain even braking force distribution between the sides of the vehicle,
• preserve correct operation with the stock ABS and electronic stability control systems,
• avoid issues with brake line fitment and pad mounting.

Color and visual aspect

The red brake caliper complements open-design wheels well, highlighting the sporty character of the S4 and S5 models. For many users, this is an important visual element that combines technical function with aesthetics, especially in high-performance vehicles.

Brake system expansion and technical knowledge

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, carriers, or brackets, check out the available parts in the Audi Brake Calipers and Carriers category. When selecting used brake system components, it is worth following proven technical inspection procedures, which is why the guide article "Second-hand brake system: how to safely choose discs, calipers, and ABS?" may be helpful, where you will find a practical checklist for purchasing such components.