Volkswagen VW Golf Mk4 Brake Caliper Wheel Brake Unit Front Left N/S 3A0615123

Volkswagen VW Golf Mk4 Brake Caliper Wheel Brake Unit Front Left N/S is an original brake system component from the Brake Calipers and Brackets group, designed for installation on the front axle on the driver's side. This used OEM part ensures a proper fit for the hub, brake disc, and brake line, which translates into stable, predictable braking performance in daily operation.

Specifications and technical data

• SKU: 3A0615123
• Mark: Volkswagen
• Condition: Used
• OEM Part Number: 3A0615123
• Substitutable numbers: 3A0615123, 3A0 615 123
• Location on the vehicle: Front, Left
• Part type: Brake Caliper
• Category: Calipers & Brackets

Purpose and fitment for Volkswagen Golf Mk4

This caliper has been designed specifically for operation on the front left side of the vehicle, ensuring that the mounting geometry, bleeder screw position, and brake line port are consistent with Volkswagen's factory design specifications. Its original Volkswagen origin ensures the maintenance of proper body rigidity, correct distribution of braking forces, and compatibility with the stock brake discs and pads used in the fourth-generation Golf.

Construction and function in the brake system

The caliper plays a key role in the hydraulic brake system – it converts brake fluid pressure into the force that presses the pads against the disc. The design intended for the front axle ensures:

• stable guidance of the pads in the carrier,
• even pressure against the working surface of the disc,
• adequate resistance to thermal loads typical for the front axle,
• proper cooperation with the stock Volkswagen master cylinder and brake lines.

This maintains proper braking efficiency and consistent operation of the entire system, without the need to modify other components.

Benefits of using an original used caliper

Choosing a used, original caliper for the Volkswagen Golf Mk4 is a reasonable compromise between cost and quality. Such a component:

• maintains the factory mounting and operating parameters specified by the manufacturer,
• reduces the risk of fitment issues typical of low-quality aftermarket replacements,
• allows for an economical repair of the brake system while maintaining the correct operating characteristics.

A used caliper from the Brake Calipers and Brackets group will work well both for a standard replacement of a worn-out part and for a staged renovation of the front axle in a fourth-generation Golf.

Safe selection of used brake system components

When choosing a used caliper, it is worth paying attention to compatibility with the specific body and engine version, as well as matching it to existing discs and pads. To streamline the verification and installation process, a practical guide describing visual inspection, assessment of working surfaces, and selection of other components will be helpful. A detailed list of steps can be found in the article Second-hand brake system: how to safely choose discs, calipers, and ABS?, which discusses the most important aspects of purchasing used brake components.

Expanding your Volkswagen brake system upgrade

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