Hi i can't get my brakes to work I've changed everything new booster master cylinder front calipers rear calipers brake pads and rotors all the rubber lines even the hard lines I ran 3/16 line from the front to the rear along with e brake cables. I just put a Wildwood adjustable proportioning valve on.. my motor doesn't make enough vacuum but I have an electric vacuum pump and its not helping. When the brake booster is full of vacuum the pedal goes almost to the floor. Its like there isn't any pressure.. I got straight fluid when I bleed the whole system. My front brakes won't even lock up. I bought I different master cylinder the other day and put it on and bleed everything it made the pedal rock hard and my front calipers were locked up. So I put the other one back on.. I just want to be able to stop

 

Do you want to do at this systematically or do you just want to throw parts at it?

1. What I would do first is plug the outlet of the master that feeds the rear brakes and install a brake pressure gauge on the outlet that feeds the front brakes. Start the car and press the brakes hard, have a helper note the maximum pressure. Also, hold the pedal down and make sure the pressure does not decrease with time.

If you see a solid 1000psi or more, then you are good, move to step 2.

If max pressure is less 1000psi but solid, take a look at your booster.

If max pressure decreases with time, you likely have an internal mastery cylinder leak from the front circuit seal.

2. Repeat with gauge on the outlet that feeds the rear brakes. If all is well with front and rear circuits, move to step 3.

3. Reconnect all lines and master cylinder and re-bleed. Install pressure gauge on each caliper and take note of everything in step 1. Rear pressure will be well less than 1000psi, but should be easily into the 100's of psi.

If you see a solid 1000psi or more, then you are good, move to next caliper.

If max pressure is less 1000psi but solid, take a look at your soft brake lines, they may be soft. This is very rare.

If max pressure is good but there is a delay to get to max pressure, you may have a partial blockage in your brake lines somewhere.

If the pressure doesn't move with the brake pedal, you may have a frozen caliper or a completely blocked brake line.

 

Sounds like you didn't bench-bleed the MC before you put it on.

With the angle the MC sits at in these cars, about 15% of the volume of the actual "cyl" in the MC, is ABOVE the line fitting; meaning, you can bleed an entire gallon of fluid through every wheel every day, and twice on Sunday just because you have the extra time, and still NEVER IN A THOUSAND YEARS get all the air out, because it's .... above the fitting.

Gotta do it right.

Go do that, then come back and let us know that it worked.