I have a '79 Blazer, and just swapped out my 12b for a 14bFF in the rear. I also installed a set of 18/39.5x15 Boggers on the rear only. Now I can't stop hardly at all. I bled the brakes quite thoroughly (ran about 1/2 quart through) and still it seems to take forever to stop. I was expecting some slow stops, but this seems worse. Is this just what I should expect (and what will get worse when I put on the 3/4t 10-bolt front axle) or is something wrong? Anything I can do to improve this such as putting on a 1-ton master cylinder or switching from vacuum assist to hydro assist (what is hydro assist, I see everyone talking about it)? I know these are stupid questions, but after about 3 weeks of driving with the big rear tires, I rearended a Pontiac GrandPrix. Everyone was ok, and all it did to my truck was bend a towhook and break the glass in one of my Hella's, but I destroyed the GrandPrix. I figure that is probably bad.