That master will work IF you remove residual pressure valve from behind the brass fitting where the line connects , use a drywall screw to thread into the fitting & pull it out , there is a small rubber piece in behind the fitting that is the residual pressure valve , the reservoir should be bigger for disc brakes but rear discs wear slowly & these cars do not get a lot of miles so check the level of the reservoir once / year or so , more often will not hurt .
