I added them to my '79 CJ5. I bought a used power brake booster/master cylinder from ebay. It worked better than the non power brakes that I had.
Then, I read a bunch of articles how a YJ power brake system was an upgrade over the CJ setup. So, I bought one of those, and swapped it in. I have GREAT brakes!! And, I don't even have the double diaphragm booster that was available in some '95 YJ's. That one is supposed to be the best.
Just install the booster/MC, and run the booster vacuum hose to a manifold vacuum port in your intake manifold (I have a V8 manifold). Bleed the brake system, and you should be all set.
I modified the booster pushrod (made it adjustable), because all the articles said to. I really don't think that it was necessary for me to do so.
Google "CJ to YJ power brake conversion." There are quite a few articles on it.
So that is the only parts i will need is a yj booster and m.cyl. And vacuum hose to manifold. I also have 304 eng. is there any particular year yj parts to look for or are they all the same? I assume it would be best to get parts off a used jeep or would new parts be much more expensive? Thanks
If you don't like what you see here, keep checking back...new ones are listed frequently.
I've bought used ones, and they have always worked. Of course, if it was all rusty and nasty looking, I would not buy it. You have to be a little fussy, here. Choose a decent looking one. That being said, it's still a gamble, but I've been lucky, so far.
As a matter of fact, I have a double diaphragm booster/MC out of a 1995 YJ that I would be willing to sell...
I think I paid around 130 from oreilly's for my yj brake booster and vette mc. all refurbished stuff from oreilly's. Still waiting to put them in. need to take a visit to my parent's place to use some tools that I don't have.
Part of your answer depends on what you are trying to accomplish. If you are trying to reduce pedal effort, than the booster is a good approach. However, if you consider your brakes inadequate (not enough stopping power) than the booster is merely attempting to treate the symptom. Putting more pressure on the brakes does not improve their energy absorption, but will help them fail faster.
'89 Wrangler YJ
97 Grand Cherokee (ZJ)
87 MB 560SL roadster