Shimano Disc Brake Mineral Oil

This oil is specifically engineered for Shimano hydraulic systems. Using it in brake systems designed for DOT fluid or other proprietary fluids can damage seals and cause brake failure, so it should not be used unless your brake manufacturer explicitly specifies Shimano-compatible mineral oil.

Most manufacturers recommend a full brake bleed at least once a year or whenever you notice a 'spongy' lever feel. If you ride frequently in wet, muddy, or steep conditions, you may need to bleed your system more often to maintain optimal stopping power.

It is best practice to perform a full system flush rather than mixing new oil with old. Old fluid often contains contaminants or moisture that can degrade performance, so flushing the entire system ensures your brakes operate with fresh, clean fluid.

Yes, 100ml is typically sufficient for a full bleed of both front and rear hydraulic disc brakes. It provides enough volume to flush the system thoroughly and account for any minor spills during the process.

The most common indicators are a lever that pulls all the way to the handlebar, a 'mushy' or inconsistent feel when braking, or a noticeable decrease in stopping power. If you experience any of these, it is time to bleed your system with fresh mineral oil.