[Red Herring]

It can sometimes be a bit difficult to get a master cylinder to prime itself and get the fluid initially going down the brake lines. I usually cheat and fill up the system with a syringe full of brake fluid put in through the bleed nipple, but another way is to either take the calipers off and hold them above the master cylinder, or the master cylinder off and put it below the calipers. This is because air rises and the big "bubble" of air you will have in a dry system goes up the pipe as quickly as you are trying to push it down and out the bottom, especially true if you have a twin line system like many race/track bikes. You can also sometimes get a bubble "trapped" if you have one of the up and over systems where the left caliper is fed by a tube that goes up and over the mudguard from the right hand one.