Yamaha Genuine BW'S 50 Front Brake Master Cylinder Reservoir Cap 4SB-F5852-10
Yamaha Genuine BW'S 50 Front Brake Master Cylinder Reservoir Cap 4SB-F5852-10
Low stock: 2 left
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Product Description
Brand new official Yamaha factory front brake master cylinder reservoir cap. Manufactured from stamped or cast high-grade weather-resistant material designed to form an airtight, leak-proof seal over the brake fluid reservoir when paired with the proper rubber diaphragm and retaining screws. Built to exact factory dimensions to prevent moisture contamination and maintain hydraulic pressure integrity in the front braking system.
Vehicle Compatibility
Engineered explicitly for Yamaha 50cc automatic scooter platforms featuring handlebar-mounted hydraulic front disc brakes.
Verified catalog fitment layout:
| Make | Model Family | Engine Type / Displacement | Model Years |
| Yamaha | BW'S 50 / Booster / Next Generation / Naked | 50cc (Air-Cooled 2-Stroke) | 1995–2016 |
| Yamaha | Slider 50 | 50cc (Air-Cooled 2-Stroke) | 2000s–2010s |
| Yamaha | Neo's 50 / YQ50 | 50cc (2-Stroke & 4-Stroke) | 1997–2010s |
| Yamaha | Aerox 50 / Nitro (Select Master Cylinder Variants) | 50cc (Liquid-Cooled 2-Stroke) | 1997–2012 |
Fitment & Technical Details
Clean the area around the master cylinder reservoir thoroughly to prevent brake fluid contamination. Remove the two small retaining screws securing the old cover, lift off the cap and rubber diaphragm, inspect the fluid condition and diaphragm seal, position the new 4SB-F5852-10 cover over the reservoir, and tighten the retaining screws evenly to specification, taking care not to overtighten or pinch the rubber gasket.
Important: Please ensure the part number matches your motorbike before purchasing. If you have any questions about the part or its compatibility, feel free to contact us. We’re here to help!
At Dmmotorcycles, we’ve specialized in vintage and vintage sports motorcycles and parts directly from Japan since 1998. We stock a wide selection of rare genuine and high-quality aftermarket parts and continually update our inventory to meet growing demand.
Looking for a specific part? Don’t hesitate to ask! We may have it in stock even if it’s not listed online. If not, we’ll do our best to source it for you.
We’re also happy to provide guidance on installation and offer excellent after-sales support to ensure your satisfaction.
Shipping Information
We ship worldwide, carefully inspecting and securely packing all parts to ensure safe delivery. Your order will be insured and shipped quickly, with the best available shipping option chosen for speed and reliability.
Please note:
- All parts are shipped from Cyprus (Europe).
- Customers outside the EU may incur additional import taxes based on the value of the item.
How we handle your order in 4 steps
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1. Order Verification
We confirm the order and make sure the correct part number, quantity, and any special requests match what’s on the sales confirmation
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2. Quality Check
Since our parts are new old stock we Inspect the parts for any defects, scratches, or missing components to ensure it meets quality standards. otherwise will notify you before proceeding with the order.
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3. Safe and Secure packaging
- Protective Wrapping: We use bubble wrap or foam padding to wrap the part, focusing on sharp edges or delicate components.
- Boxing: We place the wrapped part inside a sturdy box, filling gaps with packing materials to prevent movement.
- Sealing and Labeling: Securely tape the box and attach the shipping label, including orientation-specific markers like "Fragile."
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4. Finalizing of Shipment
We confirm the shipping address and contact details, give the package to the Post, keep the tracking number, and then send it to the customer along with the shipment notification.
