72 4 wheel disc

[bman021]

Ok I have disc on all four corners and am to the point of picking out a booster/master setup. My questions are should i stay with the original 9" or used a smaller 7" like some of the venders sell. I am not sure on the amount of vacuum that the engine makes so I'm kinda looking towards the 9". Also what about the proportioning valve, stock style made for disc/disc vs an adjustable one?

Thanks for any input!

[Burt4x4]

Not sure what " it is but the 1Ton vacum booster is WAY stronger than a 1/2T & 3/4T booster.
P valve ~ some say don't need one on 4Wdisk..some say just put one adjustale on the rear and leave the front without...or also In-Line Tube sells a 4Wdisk Pvalve ~
right now I'm using a stock Pvalve on my 4wdisk but I think my brakes should be alot stronger as I run the 1Ton. So my next step is too by-pass the Pvalve and test it out. Mine is moastly off road so as long as I can stop I don't care if the back locks up first.

[pumpkin]

Hydro Boost is the way to go. I,ve put it on two of my rigs, works awsome.

[chevyblazer]

both are great my blazer has a 95 g cherokee booster and cilindor all y had to do make a bushing for the pedal linkage