Shimano hydraulic disc brakes are extremely popular due to their ease of use, incredible braking power, and smooth modulation. Like all hydraulic brakes, they will eventually need to be bled though. If your brakes aren't delivering as much stopping power as they used to, or if you've just shortened your hoses and let some air into the system, you'll definitely want to perform a brake bleed. Not to worry! The Shimano Disc Brake Bleed Kit is just what you need to get your brakes working again in tip-top fashion. For the best performance, Shimano recommends using only Shimano-brand mineral oil when performing a brake bleed.