I took my truck to the shop and some idiot mixed up the brake lines. I'm in desperate need of some sort of blue print/instruction sheet to properly connect the lines to my boosters. Each time when I'm driving and I use the brakes, it's as though I'm engaging the hand brake. The vechile can go from 70mph to 30mph as though I'm slamming on breaks. Also when I disengage my hand brake it engages the spring brake.