Genuine OEM 21526785964 - Clutch Slave Cylinder

Product Overview

The Genuine OEM 21526785964 clutch slave cylinder is a factory-specification hydraulic component engineered for BMW 3 Series, 5 Series, Z4, 1 Series, M3, M5, M6, and 6 Series models spanning 2006 to 2018. This slave cylinder converts hydraulic pressure from the clutch master cylinder into mechanical motion to disengage the clutch, enabling smooth gear shifts across E90, E92, E93, E82, E88, E60, E61, E63, E64, E89, and F10 platforms. As a Genuine BMW part, it meets OEM specifications and is backed by factory warranty coverage when installed by BMW dealerships or certified technicians.

This clutch slave cylinder is sold individually. Verify your vehicle's specific fitment using the selector tool above before purchase.

Symptoms of a Failing Clutch Slave Cylinder

• Soft or spongy clutch pedal with no resistance or poor engagement
• Clutch pedal sinks to the floor and does not return to full height
• Difficulty shifting into gear or grinding noise when shifting
• Clutch fluid leaks visible around the cylinder or on the transmission bell housing
• Reduced clutch responsiveness or delayed engagement after pressing the pedal
• Air bubbles in clutch fluid or visible contamination in the master cylinder reservoir

Cross Reference Numbers

This Genuine OEM 21526785964 is equivalent to or replaces the following part numbers: 21-52-6-785-964, 21526785964.

Vehicle Compatibility

This part fits the popular models below. For Fitment Confidence, please use the vehicle selector tool above to verify exact compatibility for your vehicle.

• BMW 1 Series M 3.0 L6 Gas (E82): 2011
• BMW 128i 3.0 L6 Gas (E82): 2008–2013
• BMW 135i 3.0 L6 Gas (E82): 2008–2013
• BMW 328i 3.0 L6 Gas (E90): 2007–2013
• BMW 328i xDrive 3.0 L6 Gas (E90): 2009–2013
• BMW 328xi 3.0 L6 Gas (E90): 2007–2008
• BMW 330i 3.0 L6 Gas (E46): 2006
• BMW 330xi 3.0 L6 Gas (E46): 2006
• BMW 335i 3.0 L6 Gas (E90): 2007–2013
• BMW 335i xDrive 3.0 L6 Gas (E90): 2009–2013
• BMW 335is 3.0 L6 Gas (E90): 2011–2012
• BMW 335xi 3.0 L6 Gas (E90): 2007–2008
• BMW 528i 3.0 L6 Gas (E60): 2008–2009
• BMW 528i xDrive 3.0 L6 Gas (E60): 2009–2010
• BMW 535i 3.0 L6 Gas (E60, F10): 2008–2016
• BMW 535i xDrive 3.0 L6 Gas (E60): 2009–2010
• BMW 535xi 3.0 L6 Gas (E60): 2008–2009
• BMW 550i 4.8 V8 Gas (E60): 2009–2010
• BMW 550i 4.4 V8 Gas (E60, F10): 2011–2013
• BMW 650i 4.8 V8 Gas (E63, E64): 2009–2012
• BMW 650i 4.4 V8 Gas (F12, F13): 2012–2014
• BMW M3 4.0 V8 Gas (E90, E92, E93): 2008–2013
• BMW M5 4.4 V8 Gas (E60, F10): 2013–2016
• BMW M6 4.4 V8 Gas (E63, E64, F06, F12, F13): 2012–2018
• BMW M6 Gran Coupe 4.4 V8 Gas (F06): 2012–2018
• BMW Z4 sDrive28i 2.0 L4 Gas (E89): 2012–2016
• BMW Z4 sDrive30i 3.0 L6 Gas (E89): 2010–2011
• BMW Z4 sDrive35i 3.0 L6 Gas (E89): 2010–2016

This may also fit other applications. Please use the vehicle selector tool to verify fitment.

Often Replaced Together

For a complete clutch repair, many owners replace the following at the same time:

• Clutch master cylinder (if leaking or spongy pedal persists after slave cylinder replacement)
• Clutch disc and pressure plate assembly (worn friction material reduces engagement quality)
• Clutch release bearing (mechanical wear increases with slave cylinder failure)
• Clutch fluid (flush and fill with fresh DOT 4 specification fluid after any hydraulic component service)

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Frequently Asked Questions

How do I know if my BMW's clutch slave cylinder is failing?

Common signs include a soft or spongy clutch pedal that may not return fully, difficulty engaging gears, visible fluid leaks near the transmission, or a pedal that gradually sinks lower during driving. If you experience any of these symptoms in your 3 Series, 5 Series, M3, or M5, have the slave cylinder inspected immediately. Continued operation with a failed slave cylinder can damage the clutch disc and pressure plate.

What is the difference between a Genuine OEM part and an aftermarket slave cylinder?

Genuine OEM parts like this 21526785964 are manufactured to BMW's exact specifications and tolerances, ensuring perfect fit and performance. They are covered by BMW factory warranty when installed by authorized dealers. Aftermarket alternatives may be less expensive but often lack the precision engineering and warranty support of factory parts. For critical hydraulic components like the clutch slave cylinder, OEM quality is recommended to avoid repeat failures.

Can I replace the clutch slave cylinder myself, or do I need a professional?

Clutch slave cylinder replacement requires access to the transmission bell housing, proper bleeding of the hydraulic system, and careful attention to torque specifications. Most DIY mechanics can perform this job with basic hand tools, a floor jack, jack stands, and a torque wrench. However, if you are unfamiliar with manual transmission service or hydraulic bleeding procedures, professional installation is strongly recommended. Improper bleeding can introduce air into the system and cause repeat problems.

How long does a clutch slave cylinder typically last on a BMW?

Clutch slave cylinders on BMW models typically last 80,000 to 120,000 miles under normal driving conditions. Longevity depends on driving habits, clutch usage frequency, and whether the clutch hydraulic system has been properly maintained. Regular clutch fluid changes and prompt repair of any leaks help extend the life of the slave cylinder. Once failure occurs, replacement is the only remedy.

Do I need to bleed the clutch system after installing a new slave cylinder?

Yes. After installing a new slave cylinder, you must bleed the clutch hydraulic system to remove all air. Air in the lines prevents proper pressure transfer and results in a soft, unresponsive pedal. Follow the factory service manual for your specific BMW model for the correct bleeding sequence and procedure. Some vehicles require specialized scan tools to operate the bleeder solenoid valve during the process.

Will replacing the slave cylinder fix a soft clutch pedal, or could the problem be elsewhere?

A soft pedal can be caused by a failing slave cylinder, a failing master cylinder, air in the lines, or low clutch fluid. If you have confirmed that the fluid level is correct and the system has been bled, a slave cylinder replacement is likely the solution. However, if the pedal remains soft after replacement, the master cylinder or clutch hose may be the culprit. Proper diagnosis with a pressure test or visual inspection of all hydraulic components is recommended before ordering parts.

Order Genuine OEM 21526785964 today. In-stock orders ship same or next business day from our U.S. warehouse, and our fitment team is one call away if you need help confirming the right part for your BMW.

Note: All information on this page and in the FAQ is for general reference only. Verify fitment and consult a professional as needed. eEuroparts.com is not responsible for incorrect part selection or installation.