i had a similar problem with truk, my brake drag was caused by the floor pushing the brake pedal down about 1/8''
if you have any pivot bolt on the brake pedal, remove it and see if it can be re-installed easy
without moving the brake pedal down
i had to ''chicago'' the brake pivot bolt, the step down was all it needed
i chucked the bolt up in my drill press and used a cutoff wheel to reduce the bolt shaft
the remote reservoir would need to be 15 to 30 feet above the hydroboost to put any pressure on the mc
my remote reservoir is at least 24'' above my hydroboost