BMW E53 E81 E84 E87 E90 E91 Clutch Master Cylinder 6773670

BMW E53 E81 E84 E87 E90 E91 Clutch Master Cylinder is a component from the Clutch Hydraulics group, designed for the clutch release system in selected BMW models. It is responsible for the precise transfer of force from the clutch pedal to the operating mechanism, which translates into predictable drivetrain operation and comfortable gear changes.

Specifications and technical data

• SKU: 6773670
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 6773670
• Substitutable numbers: 21526773670, 6773670, 21526752146, 6752146, 21526756747, 6756747, 21526758822, 6758822, 21521163899, 1163899, KD
• Category: Clutch Hydraulics

Purpose and Function in the Clutch System

The BMW Clutch Master Cylinder operates within a hydraulic system that generates the pressure needed to disengage the drivetrain between the engine and the gearbox. A correctly selected component from this group helps maintain a stable clutch engagement point, reduces the risk of air in the system, and ensures a consistent pedal feel.

In practice, this means, among other things:

• more predictable clutch engagement and disengagement,
• reduced risk of jerking when starting off,
• better vehicle control during precise maneuvers.

Benefits of Using Genuine BMW Clutch Hydraulics

A component from the Clutch Hydraulics group dedicated to BMW is designed for specific models, which translates into proper pedal operation characteristics and compatibility with factory equipment. The correct matching of geometry and stroke limits the wear of other drivetrain components.

Key advantages include:

• maintaining the factory clutch operation characteristics in BMW E-series cars,
• consistency with the original drivetrain design,
• the ability to use existing mounting points and hydraulic lines.

Component Condition and Installation Aspects

The offered clutch cylinder is in used condition, allowing for economical system repair while maintaining the original manufacturer's specifications. This type of component is typically installed in place of the factory part, using standard hydraulic connections and factory mounting points on the body or gearbox.

When planning installation, it is worth paying attention to:

• proper bleeding of the hydraulic system after replacement,
• checking the tightness of lines and connections,
• verifying the clutch pedal operation after the first working cycles.

Part Selection by Numbers and Compatibility

The clutch master cylinder has a dedicated OEM part number and associated replacement numbers, which facilitates precise identification and selection for a specific BMW model. Verification of compatibility by numbers is particularly important for models that exist in multiple engine and gearbox variants, as differences in stroke or piston diameter can affect the perceived pedal feel.

If you have doubts about the fitment, it is advisable to compare the markings with the currently installed component or use the manufacturer's catalog to avoid installing parts with different characteristics.

BMW Clutch Hydraulics – Expansion and Service

If you are planning a comprehensive repair or upgrade of the drivetrain area in your BMW and need other components from the same group, such as slave cylinders, hydraulic lines, or fluid reservoirs, check the available parts in the BMW Clutch Hydraulics category.

If you are considering a wider range of work on systems responsible for power transmission and are interested in when it is worth opting for used components, the following guide article may be helpful: Stock vs. Sport Suspension – Construction Differences and Is It Worth Buying Used Suspension Parts?.