£BMW E87 E90 Brake Caliper Rear Left N/S Wheel Braking Unit TRW 40/10

BMW E87 E90 Brake Caliper Rear Left N/S Wheel Braking Unit is an original braking system component designed for the rear axle on the driver's side. Thanks to its design compliant with the manufacturer's standards, it ensures stable pad guidance, even pressure on the brake disc, and predictable braking system performance during daily use. It is a practical solution for users looking for a proven, factory-original component rather than aftermarket replacements of uncertain origin.

Specifications and technical data

• SKU: 6776377-1
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 6776377
• Substitutable numbers: 34216776377, 6776377, BG, 34216768191, 6768191
• Location on the vehicle: Rear, Left
• Category: Calipers & Brackets

Purpose and fitment

The presented caliper is dedicated to BMW 1 Series E87 and 3 Series E90 models, where it operates on the rear axle on the left side of the vehicle. The vehicle placement is factory-defined, which facilitates part selection during braking system repairs and minimizes the risk of installation errors. The caliper design works with the stock suspension geometry and the factory BMW braking system, ensuring proper pad guidance and braking force stability.

Construction and technical characteristics

The brake caliper belongs to the Brake calipers and brackets category, meaning it is responsible for both generating clamping force and correctly guiding friction elements relative to the disc. The floating-type construction, used as standard in these BMW models, ensures effective force transfer from the piston to the pad and compensates for minor disc alignment deviations. The use of TRW technology allows for maintaining proper body rigidity, resistance to thermal loads, and stable operation over a long period of use.

The element was designed as an OEM part, which translates into dimensional compatibility with factory BMW brake discs and pads. Properly selected guide pins and mounting seats allow for precise seating of the caliper on the steering knuckle, and the correct body geometry supports even pad wear during operation.

Benefits of using an original BMW caliper

Using an original caliper on the rear left axle in a BMW E87/E90 brings a number of measurable technical benefits:

• preservation of the factory braking characteristics of the rear axle,
• proper cooperation with stock brake discs and pads,
• stable pad guidance and even pressure on the disc,
• compatibility with factory mounting points in the suspension.

For the user, this means predictable vehicle behavior during braking, no need for system modifications, and easier diagnostics in the future. Choosing such a component is particularly beneficial when servicing the rear axle, where the balance between the left and right sides has a significant impact on driving stability.

Condition, verification, and practical application

The offered caliper is a used item, which in practice means that before installation, it is worth performing a standard service procedure: checking for leaks, the freedom of piston movement, and the condition of the guide pins. This type of component is often chosen for post-accident repairs, braking system regeneration, or replacing a damaged caliper when the priority is maintaining the original BMW specification at reasonable costs. Thanks to its compliance with the factory design, installation proceeds in a predictable manner for an experienced mechanic, without the need for adaptations or modifications.

Support with selection and additional materials

When purchasing used braking system components, it is crucial to correctly match the component to the specific vehicle version and assess its condition before installation. To organize the selection and installation process, it is worth using the practical tips described in the article: Second-hand braking system: how to safely choose discs, calipers, and ABS?. This material provides useful supplementary knowledge when planning brake service in a BMW.

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, brackets, or mounting holders, check the available parts in the BMW brake calipers and brackets category.