1990 Honda civic... I few weeks ago by brakes seemed to lock up while driving... the brake pedal would not move... now after replacing both calipurs and the bake master cylinder I have no pressure in my lines... I've tried togo through the bleeding process but it seems that with the master cylinder connected the power brake booster will not pump the master.. any ideas guys ?

Did you pre-bleed the master cylinder BEFORE you hooked up the brake lines to bleed them?

Its really difficult to install a dry master cylinder to the lines and get them to bleed.

Solved.. thank you

Always bench bleed the new master cylinder, prior to installation.