How to Bleed Air from Motorcycle Front Brakes?
2 Answers
Locate the bleeder screw on the brake caliper and remove the dust cap from the bleeder valve. Then, connect a rubber tube between the bleeder port and the drain bottle. One person should pump the brake pedal 4-5 times inside the vehicle, then firmly press and hold the brake pedal down. Meanwhile, another person loosens the bleeder screw on the brake caliper. Repeat the above steps until only brake fluid flows out without air bubbles, indicating that all air has been purged from the brake lines.
When it comes to bleeding the front brake of a motorcycle, I've got plenty of experience. During long-distance rides, I often encountered spongy brakes due to air getting into the system, which affects braking performance. Here's the step-by-step process: First, gather the necessary tools—new brake fluid, a clear plastic tube, a small wrench, and a screwdriver. Then, sit on the bike and locate the front brake master cylinder, usually a small reservoir under the handlebar. Open the cap and fill it with brake fluid up to the marked level. Next, find the bleeder valve on the brake caliper, loosen it slightly (about half a turn) with the wrench, and attach the plastic tube, placing the other end into a container to prevent brake fluid from splashing. Have someone slowly pump the brake lever all the way down while you watch for air bubbles in the tube. Once bubbles appear, hold the lever down, quickly tighten the bleeder valve, and then release the lever. Repeat this process until no more air bubbles come out through the tube. After each pump, check the fluid level and top it off if low. Be careful not to spill brake fluid on the bike's paint—it's highly corrosive. Once done, test the brakes; they should feel firm. Remember, it's best to inspect the brake system every six months or before long trips—safety comes first!
