Brake Servo BMW E60 E61 E63 E64 Brake Booster Master Cylinder Unit 6779742

Brake Servo BMW E60 E61 E63 E64 Brake Booster Master Cylinder Unit as a complete servo unit with a master cylinder is a key component of the braking system, responsible for the stable transfer of pedal pressure into the brake circuits. This original BMW component from the Brake Servos and Proportioning Valves category ensures proper pedal feel, predictable vehicle response, and compatibility with factory safety system settings. The used OEM part is a solution for users who want to maintain factory handling characteristics without the cost of purchasing a new part.

Specifications and technical data

• SKU: 6779742-2
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 6779742
• Substitutable numbers: 34336779742, 6779742, 34336761086, 6761086, 34332282819, 2282819, 34336766595, 6766595, 6765937, 6778826, 34316761073, 6761073, 34336786586, 6786586, 34336781621, 6781621, 34316761079, 6761079, 6786556
• Category: Brake Servos

Purpose and function in the braking system

The described servo unit with a master cylinder is designed for BMW 5 Series E60/E61 and 6 Series E63/E64 models, where it is responsible for brake force assistance and precise pressure dosing in the circuits. The servo uses vacuum from the engine system to reduce the force required on the pedal, while the integrated master cylinder converts pedal movement into hydraulic pressure directed to the brake calipers. A correctly selected unit guarantees linear pedal response, stable pressure, and repeatable braking parameters across the entire load range.

Construction and advantages of the original BMW unit

The original BMW servo with a brake proportioning valve and master cylinder has been designed for specific body geometry and vehicle weight, ensuring that the assistance characteristics are matched to factory settings for ABS, DSC, and other stability control systems. Using an OEM component reduces the risk of incorrect pedal travel, operation that is too soft or too hard, and uneven distribution of braking force between the axles. The unit is structurally prepared for integration with factory brake lines and engine bay mounts, which facilitates installation and minimizes the need for modifications.

Condition, fitment, and installation aspects

The item is offered as a used part, which in practice means it has been removed from a vehicle and retains the manufacturer's original specifications. Choosing such a unit is beneficial wherever maintaining the factory feel of the brake pedal and compatibility with the existing installation is important. During installation, standard service procedures are recommended: checking connections for leaks, properly bleeding the system, and verifying pedal operation after the first braking cycles. Thanks to the retention of original mounting geometry and connections, replacement is a standard workshop operation without the need for mechanical adaptation.

Benefits of using an original brake servo and proportioning valve

Using a factory servo unit with a brake proportioning valve and master cylinder in a BMW E60, E61, E63, and E64 allows for maintaining stable, predictable braking characteristics, consistent with the assumptions of BMW engineers. This is particularly important in vehicles equipped with advanced safety systems, where pressure and pedal travel parameters are included in control algorithms. An original part from this group reduces the risk of improper interaction with the vehicle's electronics while allowing for an economical repair compared to purchasing a new subassembly.

Brake system expansion and related components

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 master cylinders, servos, or proportioning valves, check out the available parts in the BMW Brake Servos and Proportioning Valves category.

To better ensure the durability of installed used components, including braking system elements, it is worth familiarizing yourself with practical tips regarding the operation and maintenance of used subassemblies – detailed advice can be found in the article How to extend the life of used car parts?.

Summary

Brake Servo BMW E60 E61 E63 E64 Brake Booster Master Cylinder Unit is an original unit from the Brake Servos and Proportioning Valves group, designed for BMW 5 and 6 Series E6x generation models. It provides proper assistance, compatibility with factory safety systems, and a perfect fit for the vehicle's construction. Choosing a used OEM component allows for a technically correct repair of the braking system while maintaining the factory pedal feel and predictable vehicle behavior during braking.