I have a 53 Chevy 3100 that I completely rebuilt the brake system with all new lines and parts about 15 years ago. However, I seldom drive the truck and probably only racked up about 5,000 miles. Recently , the master cylinder seemed to be locking up and the brakes would not entirely disengage after release of the pedal. A teardown of the master cylinder and wheel cylinders revealed a rusty colored sludge , water, and pitted sections in the wheel cylinders that were too bad to hone. I have ordered a new master cylinder and all new wheel cylinders along with new hoses. I blew out the hard lines with brake cleaner. My question is which brake fluid to use this time around. What I had used was synthetic dot 3 . A friend of mine who has a Packard that he seldom drives told me to use dot 5 silicon based . I would hope that the dot 5 would not attract moisture as dot 3 evidently did. I hope for advice on choosing dot 5. thanks
