Audi A4 S4 B9 Wheel Brake Caliper Housing Front Left N/S Braking Unit 8W0615107F

Visual condition of the part

The product shows signs of use visible in the photos.

Audi A4 S4 B9 Wheel Brake Caliper Housing Front Left N/S Braking Unit is an original braking system component designed for installation on the front axle on the driver's side. Thanks to its factory-engineered Audi design, it ensures precise fitment, stable piston operation, and predictable vehicle behavior during braking, which is crucial for driving safety and comfort. As part of the Brake Calipers and Brackets group, it provides a solid foundation for professional repairs or restoring factory braking performance in your vehicle.

Specifications and technical data

• SKU: 8W0615107F-1
• Mark: Audi
• Condition: Used
• OEM Part Number: 8W0615107F
• Substitutable numbers: 8W0615107F, 8W0 615 107 F
• Location on the vehicle: Front, Left
• Category: Calipers & Brackets

Purpose and vehicle placement

The presented caliper is designed for operation on the front axle on the left side, which means installation on the driver's side for left-hand drive vehicles. This placement requires specific body geometry, proper pad guidance, and compatibility with the steering knuckle and brake disc of the specific Audi A4 / S4 B9 generation, ensuring correct interaction with other system components.

Construction and technical function

The caliper housing acts as a support for the braking mechanism, guiding the pads relative to the disc and transferring braking forces to the steering knuckle. The design provides:

• stable mounting to the front axle steering knuckle,
• pad guidance that limits tilting,
• working space for pistons and brake fluid channels,
• maintenance of appropriate rigidity under high thermal and mechanical loads.

As a result, the caliper maintains constant pressure of the pads against the disc, which translates into repeatable braking efficiency and even pad wear.

Benefits of using an original Audi caliper

Choosing an original Audi salvaged caliper offers a number of practical benefits compared to low-budget aftermarket replacements:

• Factory geometry and fitment – preservation of original mounting points and correct positioning relative to the disc and hub.
• Compatibility with the factory ABS/ESP system – proper interaction with vehicle safety systems.
• Appropriate body rigidity – reduction of deflection during intensive braking, which improves brake pedal feel.
• Ability to use the existing braking system configuration without the need for modifications.

This solution is particularly beneficial for post-accident repairs or restoring full braking system functionality after a caliper failure.

Application in service practice

This front left brake caliper is suitable for both standard replacement of a damaged component and comprehensive braking system renovation in an Audi A4 / S4 B9. It can be used for:

• repairs following guide pin or housing corrosion,
• fixing system leaks after piston seizure,
• restoring balanced braking between the left and right sides,
• servicing fleet vehicles where repeatability and predictable performance are essential.

A properly selected caliper helps reduce the risk of vehicle pulling during braking, disc overheating, and uneven pad wear.

Condition and origin characteristics

The component comes from dismantling and is offered as a used Audi brake caliper, which represents a reasonable compromise between repair costs and maintaining original build quality. This type of part is particularly attractive to users who want to maintain the vehicle's factory specifications while managing their service budget.

To better understand how to safely use used braking system components and how to assess their suitability, it is worth reading our guide: Brake calipers under the microscope – how to reduce repair costs by choosing verified recycled parts.

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