Redid the brakes on my 55 2nd 4 years ago. New wheel cylinders from Rockauto. Rebuilt the master cylinder with a hone job and new kit installed. Just recently noticed I was loosing pressure in the master cylinder when sitting at a stoplight with my foot on the brake pedal. Got a new master cylinder from Rockauto and all is good now. Master was about $125 with shipping, but worth it for the piece of mind......
