Join Date: Nov 2000
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Re: Who has done the power brake upgrade on a CJ?
I have installed the GM dual diaphragm booster in place of my original jeep booster. The results are extraordinary. Never driven a vehicle with power brakes like these, and I have 33" tires.
The input linkage on the GM's are of various lengths. The linkage / arm can be removed if the booster is disassembled. I had the rebuilder install an arm that was of the right lenght when he rebuilt it. He strongly recommended against welding the arm on the booster as the heat could damage the booster. If you are after a rebuilt booster, why not do it the right way anyhow? Find a rebuilder that will work with you. The results are worth it. The booster bolts to the stock bracket, but the holes need to be widened. The master cylinder from my previous booster bolts right on. The "piston" rod needs to be elongated, but it just floats between the booster and master cylinder, so you can remove it to weld it, or make a longer rod from a piece of rod. It's nothing special, just a rod that is rounded on one end.
If you want powerful power assist, this will do it for you. At least 4x the original stopping power. Can easily lock up all four tires on pavement with my heel on the floor.
84 CJ7, 258, HEI, M/C 2100 carb, 5 inch lift, RS9000's, 33x12.5 BFG M/T's, Lockright, full cage & belts, Xenon flares, AMC 20 1pc axles, GM dual diaphragm brake booster