Master Cylinder & Line Lock

I am running a full width 90 xj . I have rear disc brakes as well. They are a little cushy. Don't tell me to bleed them. However I am looking for a upgrade that will bolt up without any hassle. I have seen some in the Jeep Magz.

Also does anyone run a line lock for an emergency brake. If so where did you buy it?

A line lock may not work for an Ebrake all too well. I suppose you can have a constant hot switch wired in to keep the pressure to the rear brakes. You can buy line locks here.

http://www.jegs.com/webapp/wcs/stores/servlet/CategoryDisplay?storeId=10001&catalogId=10002&catalogIdentifier=Jegs_Direct&categoryId=10159&parentCategoryId=10139

a line-lock will work as a parking brake, but NOT an e-brake. they high pressure ball-valve kind won't release when your battery dies either.

I am just looking for a parking brake. Some places around here require them as a safety. Thanks for the help.