Cupbunny 3L Brake Fluid Bleeder Kit — 1L Catch Bottle, Pressure Gauge & 4 Adapters for One-Person Brake and Clutch Flush

Cupbunny's 3L manual pressure brake bleeder kit lets one person safely flush brake and clutch systems using a 3L supply tank and 1L waste bottle for professional-quality results at home.

This all-in-one brake fluid bleeder is built to simplify fluid changes and air removal from hydraulic systems. It pairs a reinforced 3-liter pressure tank with a clear 1-liter catch bottle, four master cylinder adapters to suit many vehicle makes, and a pressure gauge plus relief valve so you can work accurately and without a helper. The kit is designed for repeat use and a tidy workspace, with thickened seals and spare O-rings included.

How does this kit let one person bleed brakes safely?

The Cupbunny kit pressurizes fresh fluid from the 3L tank through the master cylinder, forcing old fluid and air into the 1L waste bottle while you control pressure and flow alone. A built-in gauge and relief valve prevent over-pressurizing, and a secure adapter seal minimizes splashes.

• 3L pressurized supply tank for continuous fluid feed
• Readable PSI/Bar gauge for maintaining recommended pressure
• Pressure relief valve to release system pressure safely
• 1L catch bottle with hanging chain to collect waste fluid

Which vehicles will the master cylinder adapters fit?

The kit includes four precision-sized adapters to fit a broad range of master cylinder openings. Measure your cap diameter first, then choose the matching adapter for a leak-free seal across many US, European, and Asian cars.

• 43.5 mm adapter — common on many Chrysler, Dodge, Jeep models
• 45 mm adapter — fits many European master cylinders
• 49.5 mm adapter — compatible with select GM, Buick, Mazda units
• 50.7 mm adapter — for many Ford, Nissan, Hyundai, Subaru caps

What components are included and how do they improve reliability?

You get everything necessary to start bleeding right away: the pressurized tank, waste bottle with hanger, adapter set, cap wrench, suction tube, and spare O-rings. Reinforced materials and upgraded adapter caps reduce leaks and the semi-transparent tank lets you watch fluid levels during the job.

• Thickened pressure tank walls for repeated use and durability
• Upgraded adapter caps and spare O-rings to maintain a tight seal
• Cap wrench and suction tube for easier setup and connection
• Clear waste bottle with chain to keep hands free while collecting fluid

How do I use the gauge and pressure settings correctly?

The dual-scale gauge shows PSI and bar so you can set gentle, steady pressure—typically around 10–15 PSI for brake systems—while watching fluid flow into the catch bottle. If pressure rises unexpectedly, use the relief valve to vent safely before disconnecting adapters.

• Monitor the gauge while pressurizing the 3L tank
• Maintain recommended pressure to avoid damaging components
• Use the relief valve before removing any fittings to prevent spray
• Replace O-rings if seals start to leak for consistent performance

This Cupbunny 3L Brake Fluid Bleeder Kit is aimed at DIY enthusiasts, home mechanics, and small repair shops that want a dependable, single-operator solution for brake and clutch fluid maintenance. It’s ideal for anyone who prefers doing fluid service themselves but wants professional-style controls: a visible pressure gauge, robust seals, multiple adapter sizes, and a waste bottle that keeps work areas clean. Before use, confirm adapter fit with your master cylinder cap measurement and follow vehicle manufacturer fluid recommendations and safety precautions.