Thanks BobRowe,
That seems to be what I'm looking for. The jeep has D44's front and rear so it has disks. I can stop the jeep just fine as I'm used to how jeeps handle and brake with larger tires, but my GF is not used to driving a vehicle with what some would consider sub-par brakes. I've pretty much narrowed it down to master cylinder from Mercury Marquis or a 68-69 vette as from what I have read these bolt up right up to the CJ's stock brake booster... I'm figureing that the increased fluid volume should help out with the braking, if not I'll just upgrade the booster to a unit out of a YJ. I haven't had a chance to mess with it as it's been pretty cold and I've been busy with work.

Thanks again,
Fred R.