BMW Z4 E46 E85 Rear Right O/S Brake Caliper Housing Calipers 40/10

The BMW E46 Z4 E85 Rear Right Brake Caliper 40/10 is an original BMW braking system component, designed for installation on the rear right axle of the vehicle. This used caliper, from the complete brake kits category, allows for a technically correct repair of the braking system without the need for unknown aftermarket replacements.

Specifications and technical data

• SKU: 6758128
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 6758128
• Substitutable numbers: 34216758128, 6758128, 34211165032, 1165032, 34216758126, 6758126, 34211165036, 1165036
• Location on the vehicle: Rear, Right
• Category: Brake Component Kits

Purpose and BMW Fitment

The presented brake caliper has been designed as an original BMW braking system component, intended for E46 and Z4 E85 series models. The construction designed for the rear right side of the vehicle ensures proper pad guidance, stable mounting, and compatibility with the factory suspension and hub geometry.

By using a component from the complete brake kits group, consistency with other system elements is maintained, which translates to predictable vehicle behavior during braking, even distribution of braking forces, and correct interaction with the vehicle's safety systems.

Construction and Operating Parameters of the 40/10 Caliper

The 40/10 type brake caliper has been constructed to work with appropriately selected discs and pads, ensuring stable operating pressure in the cylinder and even pressing of the friction linings against the disc's working surface. The appropriate piston diameter and operating characteristics translate to:

• consistent brake pedal feel,
• repeatable braking force on the rear axle,
• correct interaction with the front calipers and the brake force regulator.

The original BMW design limits the risk of uneven pad wear and minimizes overheating during typical road use.

Benefits of Using an Original BMW Caliper

Using an original BMW brake caliper on the rear right axle offers a range of practical service and user benefits:

• Factory Fitment – maintaining the correct position relative to the disc and hub, without the need for mounting modifications.
• Consistency with the hydraulic system – appropriate operating characteristics with the brake master cylinder and flexible hoses.
• Predictable vehicle behavior – stable vehicle handling during straight-line braking and cornering.
• Possibility of using existing BMW service documentation – easier diagnostics and maintenance in the future.

For users who wish to maintain their car in a configuration close to factory specifications, such a caliper is a sensible technical and economic choice.

Condition, Verification, and Practical Application

The component comes from the used BMW parts group, allowing for economical repair while maintaining the original construction. Before installation, the standard service procedure is recommended: checking for leaks, free movement of guides, pad seats, and the bleed screw, as well as assessing the flexible hoses cooperating with the caliper.

During installation, it is worth paying attention to:

• correct positioning of the caliper on the rear right side of the vehicle,
• using appropriate pads and discs compatible with the brake system version,
• thorough bleeding of the system after completion of work.

For those planning a comprehensive brake service for their BMW, a guide describing the selection of used brake system components may be helpful – detailed tips can be found in the article “Used Brake System: How to Safely Choose Discs, Calipers, and ABS?”.

BMW Complete Brake Kits – Expansion and Selection

If you are planning a broader brake system service and are looking for other BMW complete brake kits, check the available configurations that will allow you to select compatible discs, pads, and other components for your model: BMW complete brake kits.

This approach facilitates maintaining the technical consistency of the entire system, while also allowing for optimization of service costs, especially for vehicles used daily.