i have a 90 hatch si and i took the rear disc off of a 93 integra and now i have replaced eveything but the calipers bleed the lines many times no leaks and whenever i bleed the brakes the peddel gets stiff and then when u start the car all the pressure is gone

 

This might be of some help to explain what you just said:

http://www.cliffsnotes.com/pro...=5280

Good luck though!

Dan P.

 

i said that i put a four wheel disc conversion on my 90 civic hatch and whenever i bleed the brakes i get some pressure in the pedal but then when i start the car all the pressure goes away and there are no brakes

 

did you replace the booster as well?? what kind of bleeding did you do??

 

i bled from the beeder screws and the master clinder and ya i did replace the power brake unit