My manuel drum brakes feel like standing on a brick. We have bled them more than once with no change. New master cylinder no help. Then a guy told me the bore on the master cylinder was probably too big! Anyone ever here that before. I do have brakes but not verry good. Any help! Thanks

Bore size will make a difference, but only slightly. I believe they range from 15/16" to 1-1/8". More important is pedal ratio as there is a difference on most cars between power brakes and manual. Manual need about a 4:1 ratio. Been there, done that on a 64 Plymouth when we figured out that the pedals are different after trying 3 different master cylinders.

Glazed shoes will cause the problem as stated.That and cheap shoes also.My kid had a friend put shoes on his 66 Charger.They were cheap and would stop but not very well.I always buy the best shoes or pads I can get.Rocky