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

BMW E46 Brake Caliper Rear Left N/S Brake Unit Housing Z4 E85 is an original braking system component from the Brake calipers and carriers category, designed for installation on the rear left axle. This used brake caliper provides a functional solution for drivers looking for a proven part with factory geometry and perfect fitment for the BMW braking system.

Specifications and technical data

• SKU: 6758127-2
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 6758127
• Substitutable numbers: 34216758127, 6758127, 34211165031, 1165031, 34216758126, 6758126, 34211165036, 1165036, BG
• Location on the vehicle: Rear, Left
• Category: Calipers & Brackets

Purpose and vehicle placement

The presented brake caliper is designed for operation on the rear left side of the vehicle, ensuring compatibility with the factory hydraulic and mechanical axle system. The 40/10 design ensures properly calibrated pad pressure against the disc in the rear of the vehicle, supporting stable braking and correct force distribution between the axles.

The component is dedicated to BMW models from the E46 and Z4 E85 families, ensuring the correct position of the caliper relative to the disc, carrier, and hub, as well as compatibility with the brake line and mounting hardware specified by the manufacturer.

Technical and functional characteristics

As a part from the Brake calipers and carriers category, this component is responsible for the precise guidance of brake pads and the stable transfer of force from the hydraulic system to the disc. The caliper design enables:

• maintaining constant, controlled pad pressure against the disc during braking,
• cooperation with the vehicle's factory ABS/ESP system,
• proper heat dissipation from the working area of the pads and disc.

The original BMW origin helps maintain proper body rigidity, the correct piston diameter, and mounting geometry, which translates into predictable braking system performance in daily operation.

Condition, selection, and practical application

The offered caliper is a used component, which allows for an economical restoration of braking system efficiency while maintaining the original manufacturer's specifications. This solution is particularly beneficial for repairs of vehicles used on a daily basis, where a reasonable balance between cost and quality is essential.

Before installation, a standard workshop procedure is recommended, including checking the condition of working surfaces, seals, and the freedom of movement of the piston and guide pins. A correctly selected and prepared rear left caliper helps restore even braking, reduce braking force differences between sides, and minimize the risk of overheating discs and pads.

Benefits of using an original BMW caliper

Using an original BMW brake caliper instead of a worn or damaged component allows for maintaining factory system performance parameters. Key advantages include:

• factory fitment to the hub, carrier, and brake lines in BMW E46 and Z4 E85 models,
• consistency with other rear axle braking system components,
• possibility of economical repair while maintaining the original design.

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

Expert support and cost optimization

When choosing a used brake caliper, it is worth relying on reliable knowledge regarding the safety and cost-effectiveness of such a solution. A detailed discussion of the advantages of using original, used braking system components can be found in the article Brake calipers under the microscope: How to effectively reduce braking system repair costs by choosing proven recycled parts, which will help you consciously plan your repair and select the right components.