35 years ago i had an old car the pistons were sticking. I read in hemmings motor news that people were using silcone brake fluid in old cars. So i honed out all 4 cylinders installed new rubber cups bleed the system to try to get all the new fluid in. I still have that car sometimes it maybe a year or 2 between driving it and the brakes have never locked up again still works good like when i did 35 years ago.