Why does my step van pull to the right after brake job?

ok here i go new rotters twice, new calipers twice, new pads new tires new ball joints new bushings new rear brakes, new hoses, bleaded the lines about 10 times and alignment, the pulling started after the brake job it did not pull before it vibrated so that's why i did the brake job. the pulling stars after about 10 minutes of driving. been to 3 different mechanics and spent over 2500$ and all of them have given up!!! please help if you have any idea.