Those of you that didn't jump on the Hydroboost bandwagon, how are your brakes after the rear disc swap. I have heard some can't stop and others say they can lock up their 40's. If their is a Vac-Boost combo that can lock up your tires, I don't see the advantage of going hydro. Your braking can't be better, just the brake pedal must be easier to push. Does this thinking make sense? Let me know what ya'll have found. What I'm thinking is my truck has the JB5 (1/2 ton vac system) and I am not satisfied with the performance. I can stop my truck well, but with a long pedal stroke and at no time can I "lock" my tires. I feel like I am on the verge, but It won't lock. I feel like my problem is that I need more volume for the large D60 calipers and new rear calipers. What I am thinking is that if I upgrade to the JB7 Booster and Master cylinder (3/4 ton vac boost system, this system shares the same master cylinder as the 3/4 ton hydroboost system) , I should get the extra volume that I am looking for. Has anyone else done this or am I gonna be the guinne pig? I'm sure someone has tried it.