magnum 49

My 98 Silverado has brake issues. I understand a full brake pedal when not running but cannot understand why brake goes to floor when running. This is after module was changed ,new brake lines, calibers and two master cylinders . spent several days in GM garage. computer diagnostic and computer bleed. I did a brake line by-pass of abs module and went direct to wheels still brake goes to floor. Complete bleeding new rubber flex lines and no result. Any takers would be greatly appreciated.


Thanks in advance

73shark

Welcome to the forum. You will get more views if you post your question in the Silverado section.