So... On my C-300... I've cleaned the master cylinder really well. But no one, not NAPA, not Bernbaum, Not Goers, nor anyone else I can find has a kit for a 55. Its back together, and seems to work just fine, the brakes no longer bind up and the pedal does not get hard. But I feel like I'm walking on eggs, wondering when/if a seal is going to blow. Since the 55 power brakes seem to be a rarity, maybe I should consider going to another year. Does anyone have any experience in switching a 55 to a 56 or whatever?? Frank in rainy Eugene