TRP Disc Brake Bleed Cup Bleeding Like a Pro After many miles of riding and using your hydraulic disc brakes, you'll need to replace the fluid inside your brake lines. This can easily be done using specific tools. The TRP Disc Brake Bleed Cup is a tool used for bleeding TRP hydraulic brakes. This cup makes it much easier to replace the hydraulic fluid. Features Designed for TRP hydraulic disc brakes Manufacturer's part number: ABOT001156Material: plastic | Trp | Disc Brake Bleed Cup White