Audi S5 8T Brake Caliper Wheel Braking Unit 345X29,5 Front Left N/S 8T0615123B

Visual condition of the part

The product shows signs of use visible in the photos.

Audi S5 8T Brake Caliper Wheel Braking Unit 345X29,5 Front Left N/S is an original component from the Brake calipers and carriers group, designed for use with a 345 mm diameter and 29.5 mm thick brake disc. Engineered for the front left axle, it ensures precise brake pad guidance and stable braking force transmission under sporty operating conditions.

Specifications and technical data

• SKU: 8T0615123B
• Mark: Audi
• Condition: Used
• OEM Part Number: 8T0615123B
• Substitutable numbers: 8T0615123B, 8T0 615 123 B
• Location on the vehicle: Front, Left
• Category: Calipers & Brackets

Purpose and fitment for the Audi braking system

The presented caliper is configured for installation on the front left axle, which guarantees correct operating geometry in relation to the brake disc and wheel hub. The design, intended for use with a 345x29.5 mm disc, allows for effective heat dissipation and stable operation of the braking system under dynamic loads typical for the S5 version.

Thanks to its factory origin from Audi, key mounting parameters are maintained – bolt pattern, guide pin socket positions, and brake line connection points. This facilitates replacement of a worn component without the need to modify other system parts.

Construction and operating characteristics of the caliper

The caliper belongs to the Brake calipers and carriers group, meaning it is responsible for both guiding the brake pads and providing stable mounting to the steering knuckle. The working system has been designed for even pressure distribution of the pad against the disc, which reduces the risk of localized overheating and accelerated wear.

The geometry of the body and brake fluid flow channels is adapted to the stock master cylinder and lines used in the Audi S5 8T, which promotes predictable braking force modulation and consistent pedal response. This configuration is particularly important during intensive use, where long-term stability of parameters is essential.

Condition, verification, and service application

The item is offered as a used brake caliper, which allows for cost-effective system repair while maintaining the manufacturer's original specifications. This type of component is often chosen by professional workshops and informed users who prefer OEM parts from the secondary market over replacements with uncertain parameters.

Before installation, standard service procedures are recommended: checking for leaks, ensuring free movement of the piston and guide pins, and assessing the condition of surfaces that interact with the pad and disc. A properly prepared caliper can effectively restore the efficiency of the braking system in high-performance vehicles such as the Audi S5.

Benefits of using an original Audi caliper

Using an original caliper on the front left axle allows for maintaining factory braking characteristics, which is significant for both safety and the operation of assistance systems (ESP, ABS). Precise fitment to the steering knuckle and 345x29.5 mm disc reduces the risk of vibrations, uneven pad wear, and unwanted noises during braking.

For users who are upgrading or restoring the stock braking system in an Audi S5 8T, such a caliper constitutes a coherent element of the entire system – from the master cylinder and lines to the disc and pads. This allows for maintaining predictable vehicle behavior in emergency situations and during dynamic driving.

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

When selecting used braking system components, it is worth following a proven technical condition assessment procedure. A detailed list of steps to pay attention to when purchasing discs, calipers, and ABS components can be found in the guide Second-hand braking system: how to safely choose discs, calipers, and ABS?, which will facilitate making an informed service decision.