Bonamici Racing Rear Brake Fluid Reservoir Yamaha YZF-R9 2025-2026 – Model 0040

Replacing the standard plastic reservoir on your Yamaha YZF-R9 is one of those small changes that pays dividends every time you glance at the rear brake. The Bonamici Racing model 0040 rear brake fluid reservoir fits the YZF-R9 (2025–2026) as a straight swap, giving you a CNC-machined aluminium component that is tougher, easier to read, and far better looking than the factory part — all without a single modification to your bike.

Key Features

• CNC-machined from solid aluminium billet for superior structural rigidity and a precise, rattle-free fit over any plastic OEM equivalent
• Anodised finish in your choice of colour — holds its appearance through heat, vibration, and regular cleaning
• Clear fluid-level visibility makes routine brake fluid checks quick and straightforward, reducing the chance of overlooking a low level
• Direct plug-and-play replacement for the stock rear brake fluid reservoir — no drilling, no fabrication, no guesswork
• Designed and manufactured in Italy by Bonamici Racing, whose components are trusted on road bikes and race machines alike
• Pairs seamlessly with other Bonamici Racing upgrades for a consistent, purposeful look across the rear end of the R9

Built to Last, Easy to Live With

The 0040 is machined from a solid block of aluminium rather than pressed or cast, which gives it the kind of dimensional accuracy that cheap aftermarket parts rarely achieve. The walls resist flex under braking vibration, and the anodised surface layer bonds with the metal rather than sitting on top of it, so it will not peel or fade with use. For a component that sits in a high-vibration location at the rear of the bike, that build quality matters on a daily basis — not just on track days.

Everyday Practicality

The reservoir is sized and positioned exactly as Bonamici Racing intends for the YZF-R9 chassis, meaning the fluid-level window sits where you can actually see it during a pre-ride check. Monitoring brake fluid condition is one of the simplest maintenance tasks a rider can do, and having a reservoir that makes it effortless removes any excuse to skip it. After fitting, simply check the fluid level, top up if required, and ride.

Fitment and Compatibility

The Bonamici Racing 0040 rear brake fluid reservoir is designed specifically for the following model:

• Yamaha YZF-R9 — model years 2025 and 2026

Installation uses the original fixing points and hardware. No modifications to the bike's subframe or brake system are required.

Specifications