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Message: [QUOTE="tx246, post: 523400, member: 23127"] every street bike master cylinder that ive peered into has two holes. one is fairly large and the other one is itty bitty. if the itty bitty is clogged the thing wont work. bike master cylinders generate a fair amount of pressure but have a very small fluid volume movement when actuated. just like a car, you need to bleed the master cylinder before hooking up to the brake line. you should be able to hold your thumb over the brake line hole and get pressure when you move the lever. if not cover the hole with your thumb and pull in the lever. take your thumb off the hole briefly, then cover it back up before letting off the lever slowly. this should suck fluid into the right places. repeat until you get a good shot of fluid/pressure. if you have been wailing away at the brakes for awhile you probably have lots of air in the lines. the master cylinder wont displace enough fluid to move the air out the end of the line. another trick is to make sure the wheel cylinder piston is compressed in the caliper as far as it will go, then use a c-clamp to keep it in place until you get real brake pressure. this helps keep the brake fluid volume smaller. another hint is to tap on the master cylinder with the end of a screw driver and look for small bubbles while you pump. its amazing at how small a bubble will keep the thing from working. i too like filling the system from the caliper with a hypo purchased at the feed store. i feel your pain i worked on a friends honda magna for 3 nights before i got it to pressure up. [/QUOTE]

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