I just rebuilt the master cylinder on my 300ex, but I cannot get the break to work. My parking break works fine, after fiddeling with it though. If I open the blead screw and press the break, fluid does come out, but sometimes not to much comes out. My lines are clear but not to much fluid will come out. I thought it should kind of stream out.

Help please!
THANKS!

 

You need to bleed the brakes correctly. When you open the bleed screw like that, you're letting air in, making the situation worse. the parking brake works because it's cable actuated, not hydraulic.

 

So how do I do it?

 

Actually, gravity should keep air out. If you just open the bleeder at the caliper, and dont do anything else...eventually the fluid will come out. Gravity will take over and expell the air.
If that doesnt work, snug the bleeder, hold the brake pedal down, and open the bleeder. The pedal should slowly go to the limit of its travel, then hold the brke pedal there, while snugging up the bleeder. Dont let the brake pedal return with the bleeder opened.
Is the rezzy full of fluid?
When you rebuilt the master, did you have all the new pieces in the right places?