As some of ya'll may have read, I'm still working on upgrading my Suburban to a 3/4 ton. This process included upgrading the rear axle to a 14-bolt out of a 1-ton truck. So, the brakes in the rear are a lot bigger. As a result, my stock brakes weren't doing the job. So, I've upgraded the master cylinder to a JB8 master cylinder. I left the 1/2 ton booster in the truck since it appears the same one as the 3/4 ton one. So, logic dictates that since the master cylinder is rated for 1-ton usage, it should be able to make the truck stop well....not. Now, the question is, why isn't the truck stopping well and able to lock up its brakes? My first thought is that I think I accidentally ran the master cylinder dry while bleeding the brakes. The brake pedal felt great and rock hard after bleeding the rear brakes, but went to nothing as soon as I started bleeding the fronts. When driving, I can stand on the brake pedal with both feet, and while the truck leans forward a lot, the wheels will not lock up at all. Braking distance is also considerably longer than it should be. So, I'm planning on getting some more brake fluid and re-bleeding the brakes. Should I re-bleed the master cylinder before bleeding the brakes? While I'd really rather not have to take the brake lines loose again, if I have to, I have to. Any suggestions where I should go to get my brakes braking nice and hard?