Trooperbc I have a Helm's manual for my 99 Trooper. The first step in brake bleeding is to remove the ABS fuse, if so equipped. The second step is "Set the parking brake completely, then start the engine". It then repeats the exact same warning as your Chilton's namely "Notice: The vacuum booster will be damaged if the bleeding operation is performed with the engine off."

Not saying this applies to the 95 that started the posts. Just that it is a Helm procedure for some Troopers and that is what I have used with no damage.