Goddom....comparatively speaking, there are not a lot of 1.5 ton and up owners on this forum.....but heap of knowledge from some great guys. Brent B3B is a trusted / fellow "big" truck owner and has assisted me in getting my 1.5 ton brakes fixed. For the master cylinder...I would suggest using the Toyota option as the bolt pattern is identical to the old factory master cylinder. Since my truck was going to be used for farm use, I completed eliminated the factory option brake booster and I'm glad I did. (Gasp!) My truck stops on a dime without it thanks to the new and improved Toyota master cylinder.