BMW Clutch Master Cylinder - Genuine BMW 21521156004

Product Information

The clutch master cylinder is a critical component of a hydraulic clutch system in manual transmission vehicles. It is responsible for converting the mechanical force applied by the driver’s foot on the clutch pedal into hydraulic pressure, which then engages or disengages the clutch. The master cylinder is connected to the clutch pedal and the slave cylinder via a hydraulic line.

• Difficulty Engaging or Disengaging the Clutch: A failing master cylinder can make it hard to press the clutch pedal down or may result in the clutch not fully disengaging, causing difficulty in shifting gears
• Spongy or Soft Clutch Pedal: If there are air bubbles in the hydraulic system due to a leak or failure, the clutch pedal may feel spongy or soft, requiring more effort to engage the clutch
• Fluid Leaks: Visible leaks around the clutch master cylinder or along the hydraulic line can indicate a failure. This may be noticed as fluid pooling under the vehicle or around the clutch pedal area

About Genuine BMW

The original parts used by BMW to build your car are available as replacement parts under the “Genuine BMW” brand. When ordering a Genuine BMW part you are guaranteed to get the same part that you would pick up from your local dealerships part department. Genuine BMW parts have been built to BMW’s stringent standards and are the same quality of the original parts used to build your Ultimate Driving Machine.

You may not realize this, but the parts that make up your BMW are not necessarily manufactured by BMW. No cause for concern, as BMW designs the part, hires a manufacturer, and ensures its quality to you. In fact, many of these manufacturers have been making parts for BMW for decades. In our industry these manufacturers are called OEM (Original Equipment Manufacturers), and these are often brands you recognize, including Lemforder, ZF, Sachs, Bosch, Valeo, Zimmermann, Siemens VDO, Corteco, and more. Don’t be surprised to open that Genuine BMW parts box and find an OEM branded part inside, simply with the addition of a BMW logo.

Be sure to keep an eye out for OE tags on our product pages to quickly identify parts coming direct from OE manufacturers. That extra bit of insight could save you some serious money while shopping! Refer to our OE Academy for further information regarding the OE/OEM tags throughout the site.