Mini R55 R56 R57 JCW John Cooper Works Wheel Brake Caliper Rear Left N/S TRW

Visual condition of the part

The product shows signs of use visible in the photos.

Mini R55 R56 R57 JCW John Cooper Works Wheel Brake Caliper Rear Left N/S TRW is an original braking system component designed for the rear axle on the left side in sport versions of the Mini John Cooper Works. This used TRW caliper ensures a factory fit, maintaining the correct operating characteristics of the braking system. It is a solution for drivers who want to maintain the structural integrity of their vehicle by using original Mini components at an attractive price.

Specifications and technical data

• SKU: 6784645-1
• Mark: Mini (Genuine OE)
• Condition: Used
• OEM Part Number: 6784645
• Substitutable numbers: 6784645, 34216784645
• Location on the vehicle: Rear, Left
• Category: Brake Disc Rotors

Purpose and vehicle placement

The presented brake caliper is dedicated for installation on the rear axle on the left side. This placement is crucial for the proper distribution of braking forces and vehicle stability during intensive use, especially in JCW versions with increased performance.

Selecting the correct caliper for the specific side and axle of the vehicle reduces the risk of uneven braking, vibrations, and accelerated wear of discs and pads. As a result, the braking system maintains predictable characteristics, which translates into safe vehicle handling.

Technical characteristics of the TRW caliper

The TRW brake caliper used in John Cooper Works versions has been designed with higher thermal and mechanical loads in mind, typical of dynamic driving. The construction based on OEM solutions ensures:

• stable guidance of the brake pad relative to the disc,
• appropriate rigidity of the caliper body during repetitive braking cycles,
• compatibility with the factory Mini JCW hydraulic system.

By maintaining the original geometry and operating parameters, the caliper works with standard discs and pads intended for this configuration, which facilitates service and subsequent inspections.

Benefits of using an original Mini JCW caliper

Using an original caliper in the Mini John Cooper Works braking system allows you to maintain the vehicle's structural integrity and predictable braking behavior. The main advantages of this solution include:

• factory fit to the hub, carrier, and other braking system components,
• preservation of the braking characteristics intended by the manufacturer,
• easier diagnostics and service due to compliance with Mini technical documentation,
• no need to modify the hydraulic system when replacing the component with an original equivalent.

A used brake caliper of this type is particularly attractive for users who want to maintain the sporty character of the JCW version while optimizing operating costs.

Choosing a used brake caliper – safety and practice

When choosing a used braking system component, it is crucial to pay attention to compatibility with the specific model version and placement on the vehicle. It is worth using components from the same model family, which minimizes the risk of assembly and functional problems. Additional support for an informed choice can be found in a guide describing the process of verifying the condition and compatibility of brake components – detailed tips can be found in the article Second-hand braking system: how to safely choose discs, calipers, and ABS?.

Expanding the Mini braking system

If you are planning a comprehensive repair or upgrade of the braking zone in your Mini and need other elements from the same group, such as discs, pads, or brake lines, check the available parts in the Mini brake discs category.