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Motorcycle Repair: How to Replace the Brake Fluid and Bleed the Brakes on a Motorcycle



**Always follow the instructions in your repair manual when doing repair or maintenance work on a motorcycle. Manuals can be found at the dealer and online.**

DOT 3 and DOT 4 brake fluid is hygroscopic, which means it attracts and absorbs water. It can absorb water through microscopic seams and through seals in a motorcycle brake system, and can absorb as much water as 2% or its volume per year. When brake fluid absorbs water it lowers the boiling point of the brake fluid, and the addition of water can cause corrosion to develop on brake system components. Lowering the boiling point of brake fluid can easily cause brake system failure on a hot day while riding in conditions that require an increase in braking, and it is important for all motorcyclist to include brake fluid replacement in their normal motorcycle maintenance.

Some motorcycles have dual disc front brakes, ABS and linked brake systems, so the procedure may vary from the procedure in the video. It is important to always consult the repair manual for your motorcycle before attempting any repair work.

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