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Genuine OEM 21521165451 - Clutch Slave Cylinder
Product Overview
This Genuine OEM 21521165451 clutch slave cylinder is the factory-original replacement component for the BMW M5 E39 (2000–2003). The slave cylinder is a critical hydraulic actuator in the clutch system, converting pressure from the master cylinder into mechanical motion to disengage the clutch when you depress the pedal. This Genuine OEM part ensures exact fit, proper clutch engagement, and long-term reliability on your M5.
This clutch slave cylinder is sold individually. Verify fitment for your specific M5 model year and transmission type using the vehicle selector tool.
Symptoms of a Failing Clutch Slave Cylinder
- Soft or spongy clutch pedal that does not return firmly to the rest position
- Difficulty shifting gears or grinding noise when engaging the clutch
- Clutch pedal sinks slowly to the floor after pressing
- Visible fluid leakage around the slave cylinder or on the transmission bell housing
- Clutch does not fully disengage, causing the engine to stall when stopping
Cross Reference Numbers
This Genuine OEM 21521165451 is equivalent to or replaces the following part numbers: 21521165451, 2152-1-165-451.
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 M5 Sedan 5.0 V8 Gas (E39): 2000–2003
This may also fit other applications. Please use the vehicle selector tool to verify fitment.
Often Replaced Together
For a complete clutch system repair, many owners replace the following at the same time:
- Clutch master cylinder
- Clutch disc and pressure plate assembly
- Clutch system hydraulic fluid (DOT 4 specification)
- 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 Fit™: Complete repair solutions with no guesswork.
- Established Trust: Serving the European car community since 2000.
Frequently Asked Questions
How do I know if my BMW M5 E39 needs a new clutch slave cylinder?
The most common sign is a clutch pedal that feels soft, spongy, or gradually sinks to the floor. You may also notice difficulty disengaging the clutch fully, causing grinding when shifting or stalling at a stoplight. If you see fluid leaking around the transmission bell housing or smell hydraulic fluid, the slave cylinder seal has likely failed. A professional inspection will confirm whether the slave cylinder or the master cylinder is at fault.
What tools and how long does installation take?
Replacement typically requires a floor jack, jack stands, basic socket and wrench set, a clutch system bleed kit, and a pan to catch residual fluid. Access varies depending on whether your M5 has a manual or automatic transmission; manual-equipped cars require removal of the transmission bell housing area to reach the slave cylinder. Installation and bleeding usually takes 2 to 4 hours for a professional technician or experienced DIY enthusiast. Refer to the factory service manual for exact torque specifications and the proper bleeding sequence.
Should I replace the master cylinder at the same time?
If your clutch pedal has been soft or sinking for a while, it is wise to replace both the master and slave cylinders together. Both are subject to internal seal wear over time, and replacing them as a pair ensures a fully responsive clutch system and prevents a second repair shortly after. If only the slave cylinder is leaking externally and the master cylinder is holding pressure, you may replace the slave alone.
Do I need to bleed the clutch system after installation?
Yes. After installing a new slave cylinder, you must bleed the entire clutch hydraulic system to remove all air. Trapped air will cause a soft pedal and poor clutch engagement. Follow the bleed procedure outlined in your BMW service manual, using DOT 4 clutch fluid. Improper bleeding is a common cause of incomplete repairs, so take time to ensure all air is removed before road testing.
Is this a Genuine BMW part?
Yes. This 21521165451 is a Genuine OEM BMW clutch slave cylinder, manufactured to factory specifications. Genuine parts carry the assurance of proper fit, durability, and compatibility with your M5's hydraulic and mechanical systems. Many BMW dealerships and professional technicians specify Genuine OEM components for critical clutch work to ensure long-term reliability.
What is the typical lifespan of a clutch slave cylinder?
A well-maintained clutch slave cylinder typically lasts 80,000 to 150,000 miles, though this varies with driving style and climate. Frequent city driving with heavy clutch use may shorten the interval. Regular inspection of the clutch pedal feel and watching for fluid leaks will help you catch failure early. Once a seal begins to fail, the cylinder should be replaced promptly to avoid losing all clutch pressure and becoming stranded.
Order Genuine OEM 21521165451 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 M5.
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
- MPN21521165451
- Part TypeClutch Slave Cylinder
- OE Part Numbers21-52-1-165-451, 21521165451
- Fitment
- Fitment TypeVehicle Specific
| Year | Make | Model | Submodel | Notes |
|---|---|---|---|---|
| 2000 | BMW | M5 | Base (5.0 V8 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.
