Brake Caliper BMW E90 E91 Front Left N/S Brake Unit Carrier Housing 57/30/348

Brake Caliper BMW E90 E91 Front Left N/S Brake Unit Carrier Housing is an original braking system component from the Brake calipers and carriers category, designed for installation on the front left axle of BMW 3 Series E90, E91, and E92 vehicles. This used OEM component ensures factory-fit, predictable braking performance, and consistency with the rest of the system.

Specifications and technical data

• SKU: 6773201-4
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 6773201
• Substitutable numbers: 34116773201, 6773201, 34116773203, 6773203, 57/30/348, BG
• Location on the vehicle: Front, Left
• Category: Calipers & Brackets

Purpose and fitment for the BMW 3 Series

The presented caliper is specifically designed for operation on the front left side of the braking system in selected BMW 3 Series models of the E90, E91, and E92 generations. This ensures correct mounting geometry, proper brake pad guidance, and compatibility with the factory brake discs and lines used in these body styles.

Thanks to the original BMW design, the correct braking force characteristics are maintained, as well as proper interaction with vehicle safety systems such as ABS or stability control. This is particularly important when replacing a single caliper – the factory operating parameters remain consistent with the other components of the system.

Technical and functional characteristics

As an item from the Brake calipers and carriers category, this caliper is responsible for evenly pressing the pads against the disc, stable guidance of the friction linings, and maintaining the correct operating pressure of the brake fluid. The design intended for the front axle ensures adequate body rigidity and resistance to thermal loads generated during intensive braking.

The placement on the vehicle on the front left side guarantees compliance with the factory braking force distribution in the BMW 3 Series E90/E91/E92. In practice, this translates into:

• stable vehicle behavior during emergency braking,
• even pad wear on both sides of the axle,
• proper cooperation with the factory brake master cylinder and lines.

Original origin and identification parameters

The caliper comes from the BMW production line, which means compliance with the manufacturer's internal quality standards and full compatibility with factory design solutions. The component has a dedicated OEM part number and a set of interchangeable numbers, which facilitates precise identification and selection of the correct variant for a specific vehicle configuration.

In the product description and the specifications section, you will find designations such as SKU, OEM part number, as well as available interchangeable numbers. This allows you to easily verify the compatibility of the caliper with your BMW, compare it with the currently installed component, or match the part based on service documentation.

Condition, installation, and service application

The offered brake caliper is a used component, which allows for significantly reducing the costs of braking system repairs while maintaining the manufacturer's original specifications. This is a practical solution both for workshops specializing in the BMW brand and for users servicing their cars themselves.

The designation for a specific placement on the vehicle facilitates installation – the caliper fits in place of the factory component without the need for modifying mounts or lines. With properly performed service (bleeding the system, checking discs and pads), it is possible to restore full brake efficiency at a relatively low financial cost.

How to safely use used brake calipers

Choosing original, used braking system components often raises questions about safety and durability. To make informed service decisions and optimize repair budgets, it is worth familiarizing yourself with expert tips. A detailed discussion of this topic can be found in the article: Brake calipers under the microscope: How to effectively reduce braking system repair costs by choosing verified recycled parts.

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