All the shops I trust are behind on their work so it's 1-2 months to get my truck in for the brakes. I just got new 22.5 radials mounted on single pc budd wheels and now I am ready to get the truck able to stop. The truck has a 6.0 LS and 4L80E. I have the master cylinder and wheel cylinders and brake lines. The current issue is that the fluid just stays in the master cylinder, doesn't run down into the lines. Pedal goes to the floor and I have zero braking. What could be the issue.