2khb

It's a '00 civic hatch with gsr rear calipers. Replaced the calipers with new ones along with pads and rotors all around and now I don't have any brake pressure. I have bleed all four corners and tonight installed a new mc. Pedal still feels the same. The vacuum line check valve is working, removed it and started car and was sucking air. I think the booster is fine, had car running, shut it off and removed vacuum line and the release of air. Pumped brakes with line off and pedal got very hard. Put line back on and pedal went to crap again. I bleed the mc and each corner, no air was coming out at each caliper. I have no idea right now! Need help!

shotoutacc0rd

If its the original soft brake lines those would be pretty old and probably bad

2khb

Not it, s.s. lines in it.

redlinetuning

Assuming you didn't have any issues with the pedal feel before the rear brakes were swapped?

silvertaxasteg

Please explain "[P]ut line back on and pedal went to crap again." Is the car off when you are removing/replacing the vacuum line and the pedal feel changes?

I wonder what a gauge would show if you used a vacuum pump.

2khb

Took the vacuum line off, car was off, pedal got hard as it is suppose to. Then put the line back on and started the car, the pedal then went back to having basically no pressure.

2khb

Had no issues with the pedal before replacement.

silvertaxasteg

Did you bleed the lines from furthest back (passenger rear, driver rear, passenger front, driver front)? How long a time passed between disconnecting the old calipers and connecting the new calipers? Did you run about a quart total through your brake lines?

It is possible that the master cylinder is bypassing internally, but it seems suspect to happen right as you're replacing other parts.

How many times were you pumping the brakes with the new system on? If you didn't 'prime' the calipers, it can take quite a few pumps to get enough fluid in them to move the piston out. I just adjusted the parking brake on my Ram, and after moving the pistons inside the calipers, it took five or six good strokes to get the pads to touch the rotors.