Wow I have never seen brake shoes crack I guess because of the age and mileage they did it. I have done plenty of drum brakes especially since my 1973 Volkswagen Super Beetle has 4 wheel drum brakes and my truck and my 2008 escape has rear ones too, my dads van and Jeep all have rear drums and then my sisters car does too and my moms have all four pad and rotor and our 2004 Camry that just bit the dust has 4 wheel disk brakes. At work I don’t usually do brakes but I do occasionally the only things we still see drums on are the Tacoma’s.