>I have a 1979 Vette and I have an issue with the brakes. At one time I
> had brakes and I had all new pads put on as I was having the entire
> car serviced. I put a new left front caliper on and I had good brakes
> for about two to three months.

I think I would start at the new caliper, it may be defective.
Look for blockage and leaks
that seems to be when your problems started
kickstart