ON MY 63 LESABRE WHEN I ATTACH THE VACUUM LINE TO THE POWER BRAKE BOOSTER THE BRAKES WANT TO LOCK UP. I DON'T HAVE THE REARS HOOKED UP AS HAVEN'T GOT THAT FAR IN THE RESTORATION. IS THE BOOSTER BAD OR DO I NEED TO GET REARS HOOKED UP AS ALL OR TO MUCH PRESSURE IS GOING TO THE FRONT SLAVE CYLINDERS?????
CAN ANYONE HELP????????