GM-GMC: breaks on 89 GMC 2500, brake master cylinder, vacuum line

Question
I have a 89 GMC 2500 and I replaced the front pads bled them and my pedal is still soft.

Answer
Inspect  Brake Fluid Type  Brake fluid loss or contamination  

Inspect  Master Cylinder (Brake System)  Worn or leaking brake master cylinder.  

Inspect  Brake Power Booster  Damaged booster vacuum line/check valve, or diaphram  


Good Luck
Bruce