Im dying here guys, cannot get this brake thing figured out. Decided to swap out the master cylinder with a remaned unit since its just $16. Bench bleed, and installed, NO DIFFERENCE. If I block off the vacuum to the booster I can run the truck and get the brakes to grab and stop it with a bit of pumping. That is not possible with the vacuum to the booster connected. I took apart a different booster that I had put on the truck and the diaphragm was in great shape. I dont want to buy a $115 booster and have the same issue. I am just stumped at this point. Any help would be appreciated.
