need help please with brake bleeding 63 c10

[neverwinter]

well i got the lines run and the new single master cylinder installed. went to the rear right wheel and cracked the bleeder screw and used the mutyvac to try and pull the brake fluid through. after about 15 mins i still get nothing and the level in the master cyl has not changed. i see that if i turn the bleeder screw more than 3/4 of 1 turn, a little brake fluid seeps out. same with rear left wheel.

also when i looked at the master cyl plunger, i have to push the brake nearly to the floor before the brake rod really starts to actuate the master cyl. there was no fluid in the system before so maybe this will "fix itself" when all the lines are fully bled?

am i doing something wrong/missing something?

thanks in advance for any help.
- jason