http://www.common-motor.com/honda-master-cylinder-how-to
This is how to take apart a frozen master cylinder found on many mid 70's Honda Motorcycles with disc brake. Rebuild kit is available here: http://www.common-motor.com/honda-cb-master-cylinder-rebuild-kit
Models include: 1973 CB350G, 1973 - 1976 CB360T, CB400F, CB450 K3 - K7, CB500T, CB500 K1, CB550.
Common Motor Collective is our community workshop in Houston, Texas. http://www.common-motor.com