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Yamaha FJ1100 / V-MAX 1200 Reservoir Diaphragm 36Y-25854-00
Yamaha FJ1100 / V-MAX 1200 Reservoir Diaphragm 36Y-25854-00
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Product Description
This genuine Yamaha factory-original master cylinder reservoir diaphragm is a premium rubber insert designed to seal the front brake reservoir. It acts as a barrier, preventing air and moisture from contaminating the brake fluid, which can cause spongy lever feedback and brake fade. The flexible ribbed accordion design naturally expands and contracts as fluid levels fluctuate in the reservoir during brake pad wear, maintaining a proper seal without creating a vacuum.
Vehicle Compatibility
| Make | Model Range | Application |
| Yamaha | FJ1100 / FJ1200 (1984–1993) | Front Brake Master Cylinder |
| Yamaha | V-MAX 1200 (1985–2007) | Front Brake Master Cylinder |
| Yamaha | FZ750 / FZ600 / FZX700 Fazer | Front Brake Master Cylinder |
| Yamaha | SRX600 (1986) | Front Brake Master Cylinder |
| Yamaha | YX600 Radian (1986–1990) | Front Brake Master Cylinder |
Note: This specific rectangular master cylinder diaphragm is a highly versatile standard seal used across almost all of Yamaha’s premium 1980s street, sport, and touring models.
Fitment Details
This is a direct OEM replacement. Before fitting, completely clean any old, crystallized brake fluid or debris from the reservoir rim and the cap plate. Carefully seat the rubber diaphragm into the reservoir recess—make sure it lies completely flat and square. Ensure the small plastic diaphragm bushing/plate (if equipped) sits properly on top before threading down the metal cover plate. Tighten the reservoir screws evenly but gently; over-tightening will pinch and distort the rubber gasket, causing fluid to leak onto your paintwork.
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.
