Audi A3 S3 8Y Brake Caliper Rear Left N/S Wheel Brake Unit Red 5WA615423E

Visual condition of the part 

The product shows signs of use visible in the photos. 

Audi A3 S3 8Y Brake Caliper Rear Left N/S Wheel Brake Unit Red is an original brake system component from the Brake calipers and carriers group, designed for installation on the rear left axle. The red finish emphasizes the sporty character of the S3 version while ensuring visual consistency with the factory Audi brake package. This is a solution for users who expect precise brake performance and an aesthetic look for their wheels.

Specifications and technical data

• SKU: 5WA615423E
• Mark: Audi
• Condition: Used
• OEM Part Number: 5WA615423E
• Substitutable numbers: 5WA615423E, 5WA 615 423 E
• Location on the vehicle: Rear, Left
• Color: Red
• Category: Calipers & Brackets

Purpose and vehicle placement

The presented caliper is designed to work on the rear left side of the vehicle, which is crucial for the proper distribution of braking forces in the Audi A3 / S3 8Y generation. Proper placement ensures correct interaction with the brake disc, pads, and hydraulic system, minimizing the risk of uneven wear of friction elements.

The dedicated application for a specific Audi model eliminates the need for modifications, and the installation process is predictable for a mechanic – maintaining the factory geometry of the braking system.

Technical and design characteristics

As a component in the Brake calipers and carriers category, this caliper is responsible for the stable guidance of the brake pads relative to the disc and the effective transfer of pressure from the hydraulic system into braking force. The design intended for the rear axle works in conjunction with vehicle safety systems, such as electronic stability control or brake force distribution.

The red color serves not only a visual function – it also facilitates quick identification of the component during service inspections, which is helpful when verifying the completeness of the sports brake package. The used condition of the part allows for an economical restoration of the braking system's efficiency while maintaining the manufacturer's original specifications.

Benefits of using an original Audi caliper

Using an original caliper in the Audi A3 / S3 8Y translates into a number of practical advantages:

• maintaining factory brake system performance parameters,
• visual consistency with other rear axle components,
• easier diagnostics and service due to compliance with manufacturer documentation,
• reduced risk of fitment issues compared to aftermarket replacements.

For users looking for a compromise between cost and functionality, a used, original caliper is a reasonable choice for post-accident repairs, replacement after mechanical wear, or restoring the car to factory specifications.

Selection, safety, and operation

When replacing a caliper on the rear axle, it is recommended to simultaneously check the condition of the brake discs, pads, and brake lines to ensure the uniform operation of the entire system. A properly selected and installed caliper affects vehicle stability during braking, especially in emergency situations and during active operation of driver assistance systems.

If you want to deepen your knowledge about the safe selection of brake components from the secondary market, it is worth reading the guide: Second-hand brake system: how to safely choose discs, calipers, and ABS?. The article contains a practical checklist that helps assess the condition of used components before installation.

Expanding the Audi brake system

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 mounting carriers, check out the available parts in the Audi brake calipers and carriers category.