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I'm sure the Mustang II master is to small for the rear brakes. I would go to a Corvette or Mustang GT master with equal size reservoirs. You may need to install a prop valve in the rear to reduce the pressure after the new master. I use a NAPA # 36367 master. You will need to elongate the mounting holes to get it to fit the Mustang II booster. You will also need to adjust the rod between the booster and master, the tip does screw in and out for adjustment. You should have 1/16" between the 2. I usually adjust the rod so it contacts the master when installed then back the rod off.
Don
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