BMW 3 Z4 Series E46 E85 Rear Left N/S Brake Caliper Housing 40/10

The BMW 3 / Z4 E46 E85 Rear Left Brake Caliper is an original part from the Brake Calipers and Brackets group, designed for installation on the rear axle on the driver's side. This solution allows for the restoration of proper brake system operation, maintaining the factory braking force characteristics and compatibility with the BMW suspension design.

Specifications and technical data

• SKU: 6758127
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 6758127
• Substitutable numbers: 34216758127, 6758127, 34211165031, 1165031, BG
• Location on the vehicle: Rear, Left
• Category: Calipers & Brackets

Intended Use and Fitment for BMW E46 / E85

The presented caliper is structurally adapted for BMW 3 Series E46 and BMW Z4 E85 platforms, where it operates on the rear axle on the left side of the vehicle. Its placement on the vehicle is designed to work with the factory caliper bracket, brake disc, and brake line, without requiring modifications to the system's geometry.

By maintaining the original body geometry and mounting points, this component allows for precise pad guidance relative to the disc, which translates to stable, repeatable braking and even wear of the friction material.

Body Construction and Technical Characteristics

The caliper body is a robust "caliper housing" designed to work with a piston of the appropriate working diameter. The construction is intended for cooperation with a hydraulic brake control system, ensuring proper transfer of fluid pressure to the brake pad.

The arrangement of fluid flow channels, seal seats, and guides has been optimized for BMW models, which facilitates brake bleeding and maintains stable braking characteristics under typical operating conditions. The housing is prepared for operation in a demanding environment – near the wheel, exposed to variable temperatures, moisture, and road debris.

Condition, Verification, and Service Application

This part is a used component from a dismantled vehicle and is offered as a used BMW brake caliper, allowing for economical system repair while maintaining the original manufacturer's specifications. This type of component is particularly useful for:

• repairing the system after a seized or stuck piston,
• mechanical damage to the body or mounting threads,
• restoring even braking on the rear axle.

Before installation, standard service maintenance is recommended: checking the condition of the guides, seals, mating surfaces, and replacing the brake fluid according to the vehicle manufacturer's procedure. This approach increases the durability of the entire system and reduces the risk of uneven braking.

Benefits of Using an Original BMW Caliper

Using the original left rear caliper body in BMW E46 / E85 ensures:

• factory fitment to the hub, disc, and bracket, without the need for modifications,
• consistent operation with other brake system components,
• maintenance of the braking force characteristics on the rear axle as intended by the manufacturer.

For users who want to make informed purchasing decisions for used parts, especially for the braking system, a guide describing the selection and inspection process for such components will be helpful – you can find it in the article Used Brake System: How to Safely Choose Discs, Calipers, and ABS?.

Expanding BMW Brake System Upgrades

If you are planning a comprehensive repair or upgrade of the braking area in your BMW and need other parts from the same group, such as additional caliper bodies, brackets, or mounting holders, check the available parts in the BMW Brake Calipers and Brackets category.

To extend the period of trouble-free operation of used components, including brake system parts, it is worth familiarizing yourself with practical tips on the maintenance and operation of dismantled parts, described in the guide How to Extend the Lifespan of Used Car Parts?.