Interesting that a brake shoe that never has to stop a moving vehicle would need replacing. I guess it could develop a stress crack. I had a P30 in the 90’s and at the MV inspection they applied the emergency brake pedal. I had never used it and apparently the cable had corroded and it froze locking the drive shaft (auto park) brake. I could move it to my mechanic’s shop, but I did need new shoes after I got there!
Dave