How Do You Bleed Motorcycle Brakes.Why Would No Pressure Build Up.?
–First check that your master cylinder is working. –Remove the brake hose from the master cyl. Block the hole with your finger and pump the brake. The pressure should push your finger off. If not, rebuild the master cyl (first make sure the master cyl is filled). –Put the brake line back on. –Remove the brake hose from the brake caliper. –With your thumb and finger, block the opening of the hose. Bleed the brake with your fingers. Pump-hold-release & close the hose to let air out. Keep repeating until no air comes out. –Quickly re-attach the hose (to keep air from getting back in the hose). –Bleed the brake using that bolt (not the nipple) until air is out. –Bleed normaly with the nipple.
Have you replaced a part in the brake system lately? The reason I ask, is once a customer brought in a bike he had dumped, and he replaced the broken front brake lever on the handle bar. We couldn’t get the system to bleed. What had happened, he installed the screw that adjust the free play on the lever backwards, and it wouldn’t allow the master cylinder piston to return far enough. If not: Pump the brake, then hold it down while someone opens the bleeder valve, (put a piece of clear gas hose on valve, through a lid screwed onto a bottle with some brake fluid in it) then shut valve, release brake, repeat. Another method is to get a squirt oil can that has a trigger, and a spout. Put a piece of clear gas line connecting spout to bleeder valve, pump the trigger to build pressure (with valve open), and pump brake as oil can is pumped. Close valve, when all air is bled, then try bleeding traditional method (see above).
