The Honda CRF450 uses DOT 4 brake fluid that should be inspected after each race or 2.5 hours of use. It should be flushed and bled every two years, whenever the brakes feel spongy, or if the brake system has been taken apart and rebuilt. Always use fresh brake fluid from a tightly sealed container.
SAFETY FIRST: Protective gloves and eyewear are recommended at this point.
Warning: Brake fluid is very caustic and can damage paint, chrome and plastic. Wipe up any spills immediately.
Turn the handlebars until the top of the front master cylinder reservoir is level with the ground. For the rear, make sure the bike is on level ground and sitting perfectly upright. Check the level of brake fluid.
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