[PeteVS]

I think that one of the great advances in brake design came about 1964. That was the "jelly jar" type of master cylinder cap that had a nice "rolling" diaphragm that allowed the fluid level to change each time you stepped on the brakes without pumping moisture laden air in and out of the vent hole over the fluid. I got a '63 Chebby and I wish it had a '64 type master cylinder for that reason, but I am using silicone fluid in it.