Audi A8 D4 4H Brake Caliper Wheel Braking Unit Front Left N/S 380X36 4H0615123A

Audi A8 D4 4H Brake Caliper Wheel Braking Unit Front Left N/S 380X36 is an original braking system component designed for use with large-diameter brake discs, installed on the front axle on the driver's side. Thanks to its factory-engineered Audi design, it ensures stable brake pad guidance, uniform pressure, and predictable vehicle behavior during heavy braking.

Specifications and technical data

• SKU: 4H0615123A
• Mark: Audi
• Condition: Used
• OEM Part Number: 4H0615123A
• Substitutable numbers: 4H0615123A, 4H0 615 123 A
• Location on the vehicle: Front, Left
• Category: Calipers & Brackets

Purpose and function in the braking system

The offered caliper belongs to the Brake Calipers and Brackets category and is designed to operate on the front axle on the left side of the vehicle. As a component mounted directly at the wheel, it is responsible for converting hydraulic pressure into clamping force on the brake pads, which is crucial for the braking efficiency of a heavy luxury sedan like the Audi A8.

Its placement on the front axle means this component operates in the most heavily loaded part of the braking system, which is why its proper design and fitment are essential for maintaining vehicle stability, especially at higher speeds and during emergency braking.

Construction and fitment for Audi A8 D4

The caliper has been developed specifically for the Audi A8 D4 platform, taking into account the geometry of the steering knuckle, brake disc, and brake pads used in this model. The correct mounting spacing, body shape, and pad guidance allow for proper alignment with the larger diameter and thicker brake disc, which translates into effective heat dissipation and stable operation under prolonged load.

Its original Audi origin helps maintain factory braking parameters, minimizes the risk of improper fitment, and reduces the need for additional modifications during installation. This is particularly important in premium-class vehicles, where the braking system is tuned for weight, load distribution, and assistance systems (ESP, ABS).

Condition, verification, and safety of use

The item is offered as a used part, which allows for an economical repair of the braking system while maintaining the manufacturer's original specifications. Before installation, standard service procedures are recommended: inspection of working surfaces, threads, brake line ports, and potential seal regeneration in accordance with manufacturer guidelines or good workshop practices.

To better prepare for the purchase and installation of used brake components, it is worth using the practical tips included in the guide: Second-hand braking system: how to safely choose discs, calipers, and ABS?. The article helps step-by-step to assess the condition of components, verify their selection, and avoid common purchasing mistakes.

Benefits of using an original caliper

Using a factory caliper on the front left side of an Audi A8 D4 provides a number of practical benefits:

• maintaining the braking characteristics intended by the vehicle manufacturer,
• proper interaction with safety systems (ABS/ESP) thanks to correct geometry and clamping force,
• material and structural consistency with other braking system components,
• serviceability based on standard procedures and repair kits.

For users expecting predictable vehicle behavior and repeatable braking parameters, choosing an original caliper is a technically safe and easy-to-maintain solution.

Braking system expansion and related parts

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 brackets, or supports, check the available parts in the Audi Brake Calipers and Brackets category.

This approach allows for consistent selection of components within one brand and construction group, which facilitates subsequent diagnostics and servicing of the entire system.