You should check the M.C. to see if it has dual residual valves in it, iif so the one that ends up feeding the disc brakes needs to be removed and left out. If it has one in the front and none in the rear then use the rear for the discs Someone on here several years ago siad that the Mopar OEM K car M.C. where really wierd and had them(the residaul valves) in both lines I use a #6 or # 8 self tapping screw to insert and turn it in oopne to three turns into teh brass seats and then pull teh seats out to see if the residual valve is in there or not It is a little rubber one way valve with a tiny flapper valve on end and nothing on the other end that the little springs ride in. IHTHs
if the reservior has isolated chambers the the bigger chamber is normally the one for the disc brake line. The last late model new Mopar M.C. I bought had a common chamber so I had to check for the residual valves