Rear wheel cylinders

It was a faulty wheel cylinder, but it's nice to know I can come here and get smart *** comments. I'm fifty years old, this isn't my first brake job. J06 you were right, they were shitty Chinese cylinders. The car was restored twenty years ago, I put maybe 300 miles a year on it (That's 6000 miles). That's why they didn't need replacing sooner. And I have all the original service manuals.