Been driving old cars for years, never had a problem.
Until about a week ago. Had a brake issue on my 20-year-old Accord, thought it might be a rear cylinder for some reason, or maybe a master cylinder.
Messed around with the rear brakes, put on new shoes and replaced one of the cylinders. After I bled, I tried the pedal and had a gusher of fluid. Rusty line going to the cylinder.