Hy cowman79, If your truck still has its factory brake booster it must be included in the bleeding process. When you replaced your master cylinder did you bench bleed it before installing it? I will give you the proper bleeding sequence from the shop manual, one is the master cylinder itself if it has a bleed screw, number two is the booster, number three is the right rear, number four is the left rear, number five is the right front (if your truck has twin front brake cylinders then bleed the lower right first and then the upper right front) number six is the left front with the same instructions as above if the truck is equipped with twin front wheel cylinders, number seven is the brake booster for the second time. Hope that helps, good luck
