I've tried running without a booster but found the pedal was just too heavy to be comfortable. I'm not saying it's not possible but with my calipers and CNC dual master setup, the pedal was just too heavy. I believe the root cause was that there isn't enough leverage with the Pantera's "short" brake pedal. With a longer pedal, such as SACC's aftermarket "racing" pedal setup, the pedal effort, without a booster, is reasonable.
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