Hi everyone. Long time Chevy guy but first time medium duty owner. I just recently picked up a 1965 C 60. Truck is in great shape body wise with very very minimal rust but does. have a few mechanical issues. My biggest concern at this point is the brakes. I have a pretty serious leak on the passenger side rear so I am assuming I have a bad wheel cylinder. While I am well versed in repairing brakes, I am concerned about the split rim wheels which I am pretty sure this truck is equipped with. I plan on upgrading to one piece rims in the future but for now I need to get the brakes functioning correctly. Any suggestions as to how to attack this as safely as possible?