Bonamici Racing Rear Brake Fluid Reservoir Yamaha YZF-R9 (2025-2026) VS10P

Replacing the standard plastic reservoir on your Yamaha YZF-R9 with the Bonamici Racing VS10P is one of those small changes that pays dividends every time you pop open the service cover — solid CNC-machined aluminium, an anodised finish that ages better than any OEM plastic, and a direct bolt-on fit that makes the swap straightforward enough to do in your own garage.

Key Features

• CNC-machined from solid aluminium billet for structural rigidity and a significant step up in durability over the original plastic unit
• Anodised surface finish resists corrosion, heat discolouration and brake fluid spills while giving the R9's rear end a purposeful, Italian-made aesthetic
• Superior heat and pressure resistance compared to the factory plastic reservoir, keeping brake fluid condition more stable under hard use
• Clear fluid-level visibility built into the design, so routine brake fluid checks at home or in the paddock take seconds
• Direct plug-and-play replacement using the stock mounting points — no drilling, no fabrication, no specialist tools required
• Available in eight anodised colours to coordinate with other Bonamici Racing components or your bike's existing colour scheme

Build Quality and Everyday Value

The VS10P is produced in Italy by Bonamici Racing, a manufacturer with a long track record in precision aluminium components for road and race machinery. The reservoir is machined from a solid aluminium block rather than cast or injection-moulded, which means consistent wall thickness, tighter tolerances and a surface that holds its anodised finish for the long term. For riders who cover real mileage on a Yamaha YZF-R9 rather than just weekend blasts, that durability translates into a component you replace once and forget about.

The improved heat resistance over the stock plastic item is particularly relevant on the rear brake circuit, where fluid temperatures can climb during extended road use in traffic or repeated braking on a track day. A more thermally stable reservoir helps maintain consistent brake feel and reduces the risk of fluid degradation at the reservoir walls.

Installation and Maintenance Notes

The VS10P mounts directly to the existing bracket on the Yamaha YZF-R9 using the factory fixing points, making this a true drop-in replacement. After fitting, check the brake fluid level and inspect all connections for sealing before riding. The reservoir design allows a clear sightline to the fluid level markings, which simplifies your pre-ride checks and routine brake fluid maintenance intervals.

Fitment and Compatibility

• Yamaha YZF-R9 — model years 2025 and 2026

Specifications