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Genuine OEM 21516777428 - Clutch Slave Cylinder
Product Overview
This Genuine OEM 21516777428 clutch slave cylinder is the factory-spec hydraulic component that engages and disengages the clutch on manual-transmission MINI Cooper and Cooper S models from 2002 to 2008 (R50 and R52 chassis). The slave cylinder converts hydraulic pressure from the master cylinder into mechanical motion, allowing smooth clutch operation. As a genuine OEM part, it meets BMW-Chrysler Prince engine specifications and carries full factory warranty coverage when installed by a dealership or qualified technician.
This clutch slave cylinder is sold individually. Verify fitment for your specific MINI model year and transmission type before ordering.
Symptoms of a Failing Clutch Slave Cylinder
- Soft or spongy clutch pedal with no resistance
- Clutch pedal sinks to the floor and does not return to normal height
- Difficulty shifting gears, especially into first or reverse
- Clutch fluid leaking from the slave cylinder or onto the transmission bell housing
- Grinding noise when attempting to engage the clutch
- Clutch engages only at the very top of the pedal travel
Cross Reference Numbers
This Genuine OEM 21516777428 is equivalent to or replaces the following part numbers: 21-51-6-777-428, 21516777428.
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.
- MINI Cooper 1.6 L4 Naturally Aspirated (R50): 2002–2004
- MINI Cooper S 1.6 L4 Supercharged (R53 hatchback, R52 convertible): 2002–2008
This may also fit other applications. Please use the vehicle selector tool to verify fitment.
Often Replaced Together
For a complete clutch hydraulic service, many owners replace the following at the same time:
- Clutch master cylinder
- Clutch fluid (DOT 4 or DOT 5.1 per factory specification)
- Clutch disc and pressure plate (if clutch wear is present)
- Clutch release bearing
Why Shop at eEuroparts.com?
- Proven Expertise: Over 25 years of experience with European vehicles means we know your car inside and out.
- Fitment Confidence: Our accurate cataloging ensures you get the right part the first time, backed by our fitment guarantee.
- Fast, Reliable Shipping: Most in-stock orders ship the same or next business day from our U.S.-based warehouse.
- Transparent Pricing: Competitive prices with no hidden fees or surprise charges.
- Exclusive Kits That Fitâ„¢: Complete repair solutions with no guesswork.
- Established Trust: Serving the European car community since 2000.
Frequently Asked Questions
How do I know if my MINI Cooper or Cooper S slave cylinder is failing?
The most common signs are a soft clutch pedal that sinks to the floor, difficulty engaging gears, or visible hydraulic fluid leaking around the cylinder body mounted on the transmission bell housing. If your pedal feels mushy or requires excessive pressure to disengage the clutch, the slave cylinder is often the culprit. Bleed the clutch system first to rule out air in the lines; if the problem persists after bleeding, the slave cylinder seal has likely failed.
Can I replace just the slave cylinder, or do I need to replace the master cylinder too?
You can replace the slave cylinder alone if it is the only failed component. However, if the master cylinder shows signs of wear, leakage, or internal seal failure, replacing both at the same time prevents a second repair soon after. Many technicians recommend replacing the entire clutch hydraulic system as a set to ensure consistent performance and avoid repeated labor costs.
What is the difference between the R50 and R52 slave cylinders?
The R50 (2002–2006 hatchback) and R52 (2005–2008 convertible) share the same slave cylinder design for their respective manual transmissions. Verify your chassis code and transmission type using the vehicle selector tool to confirm the correct part for your MINI.
How difficult is it to replace the clutch slave cylinder on a MINI Cooper?
Slave cylinder replacement on an R50 or R52 MINI typically requires removing the transmission or accessing the cylinder from underneath the vehicle. This is a moderately involved job requiring a floor jack, jack stands, and basic socket tools. If you are not experienced with transmission work, professional installation is recommended. Expect the job to take several hours, including bleeding the clutch system afterward.
Do I need to bleed the clutch system after installing a new slave cylinder?
Yes. After installing a new slave cylinder, the clutch hydraulic system must be bled to remove all air. Follow the procedure outlined in your MINI service manual or consult a qualified technician. Incomplete bleeding will result in a spongy pedal and poor clutch engagement.
Is this a genuine BMW-MINI part, and does it carry a warranty?
Yes. This is a genuine OEM part manufactured to factory specifications for MINI manual-transmission vehicles. When purchased through eEuroparts.com and installed by a dealership or qualified technician, it qualifies for manufacturer warranty coverage. Always verify fitment for your specific model year and transmission type before installation.
Order Genuine OEM 21516777428 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 MINI.
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.
- BrandGenuine OEM
- ManufacturerGenuine OEM
- MPN21516777428
- Part TypeClutch Slave Cylinder
- OE Part Numbers21-51-6-777-428, 21516777428
- Fitment
- Fitment TypeVehicle Specific
| Year | Make | Model | Submodel | Notes |
|---|---|---|---|---|
| 2002 | Mini | Cooper | Base (1.6 L4 GAS) | |
| 2002 | Mini | Cooper | S (1.6 L4 GAS) | |
| 2003 | Mini | Cooper | S (1.6 L4 GAS) | |
| 2003 | Mini | Cooper | Base (1.6 L4 GAS) | |
| 2004 | Mini | Cooper | S (1.6 L4 GAS) | |
| 2004 | Mini | Cooper | Base (1.6 L4 GAS) | |
| 2005 | Mini | Cooper | S (1.6 L4 GAS) | |
| 2006 | Mini | Cooper | S (1.6 L4 GAS) | |
| 2007 | Mini | Cooper | S (1.6 L4 GAS) | |
| 2008 | Mini | Cooper | S (1.6 L4 GAS) |
Warranty Overview
At eEuroparts, we stand behind the quality of the products we sell. Every part we offer is backed by a warranty designed to give you peace of mind and protect your investment.
Standard Warranty – Most Parts
Coverage: 2 years or 24,000 miles (whichever comes first) from purchase date.
Protection: Defects in materials or workmanship under normal personal use.
Eligibility: Applies only to the original purchaser and the vehicle where the part was first installed.
Exclusions:
Wear-and-tear items (brake pads, filters, bulbs, wipers, etc.)
Commercial, fleet, rideshare, off-road, or racing use
Improper installation, misuse, accidents, or modifications
Not Covered: Labor, shipping, towing, or incidental costs.
Bison Performance Warranty – Our House Brand
Coverage: Limited Lifetime Warranty for as long as you own your vehicle.
Applies To: All products sold under the Bison Performance label.
Premium Protection: Goes beyond our standard warranty — if it’s a Bison product, the 2-year/24k mile limit is replaced with lifetime coverage.
Exclusions: Same as the standard warranty (normal wear, commercial use, improper installation, etc.).
What’s Included: Replacement of the defective product (labor and shipping excluded).
Warranty Claim Requirements
To keep claims fast and fair, we require:
Proof of purchase (invoice or order confirmation).
Photos or videos showing the defective part, order number, date, VIN, and odometer reading.
Diagnostic reports or part returns for non-visible issues may be requested.
Claims must be truthful, properly documented, and reflect normal consumer use.
Buy With Confidence: We back our products because we believe in their quality, with a transparent, customer-first warranty process you can trust. And with Bison Performance products, you’ll enjoy Limited Lifetime protection—an assurance few brands can match.
For full details and exclusions, please see our complete Warranty Terms & Conditions.
This summary is for convenience only. For full warranty coverage details, exclusions, and requirements, see our official Warranty Terms & Conditions. In case of conflict, the full policy governs.
Return Policy Overview
Most parts can be returned within 30 days of delivery if unused, uninstalled, and in original packaging.
To start a return, contact customer support via Chat or Contact Us.
Restocking fee: Up to 20% may apply for certain orders (buyer’s remorse, order errors, or special-order items)
Refunds: Issued to your original payment method within 3–5 business days after inspection
Exchanges: Not automatic — please return and reorder
Replacements: May be approved for incorrect or defective items reported within 7 days
Not returnable:
Used or installed parts
Electrical components
Opened filter kits, gaskets, or contaminated items
Final sale or custom orders
Important Notes:
Return shipping is your responsibility unless we made a verified error
Fitment is the customer’s responsibility (we can assist, but do not guarantee)
Country of origin may vary and is not grounds for return
For complete details, please see our full Return Policy.
This Returns summary is provided for convenience only. All returns, refunds, and exchanges are subject to the complete Returns Policy. In the event of any conflict, the full policy governs.
Fast, Reliable Shipping — Straight to Your Door
We ship most orders the same day when placed before 2 PM CST (Monday–Friday). Our main warehouse is just east of Nashville, TN, and we also ship from multiple locations nationwide to get your order to you as quickly as possible.
We use trusted carriers like UPS, FedEx, and USPS.
Tracking info is emailed to you as soon as your order ships.
Delivery estimates at checkout are based on carrier data, but not guaranteed.
Need help with a shipment?
If your order is missing, damaged, or incorrect, just let us know within 5 days of delivery. We’ll walk you through the quick claim process — including a few photos to help us make things right.
For complete details, please see our full Shipping Policy.
This Shipping summary is provided for convenience only. Delivery times, carrier terms, fees, restrictions, risk of loss, and other details are governed by our complete Shipping Policy. In the event of any conflict, the full policy governs.
