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homepagez 10-24-2007 12:11 PM

YJ brakes on a CJ
Any thoughts on the common practice of placing YJ brakes on a CJ?

Here is one of many links showing the How-To:

Busted Jeep.Com! - In The Garage - YJ Brakes on a CJ

Good/Bad idea?


Jim_Lou 10-24-2007 02:00 PM

There are two primary factors of brake performance: Ability to apply stopping force, and ability to shed the heat generated doing so which, if insufficient, leads to brake fade. That modification won't help with the latter problem, which you might encounter going down long grades or stopping from high speed, especially when pulling a trailer or carrying a heavy load.

If you aren't having fade problems, and already have power brakes, it looks like a good idea. Otherwise, you might be better off incorporating a CJ booster unit.

Booger 10-24-2007 07:52 PM

I used the Master/Booster Cylinder from a YJ on my CJ with no other problems than to change over to the EFI system. It works great but if you need a CJ booster for brakes I have a brand new one I'll let go for cheap.


"Genius and insanity sometimes walk the same side of the street"

homepagez 10-24-2007 09:00 PM

Thanks for the offer!

I would like to put a booster on my '81 CJ7.

You can contact me at jroberts321 at to talk details.



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