Jim where did you get you brake shoes and what brand? My brakes on my 6,500 lb Cadillac hearse would lock up when I first put on the new shoes then after a week or so they would be glazed and not stop again. DOnt let anyone tell you otherwise, CADILLACS CAN LOCK UP BRAKES I KNOW I HAVE A 59 AND 62. Now I must say Ive never tried at 50MPH. THanks