A customers BMW came in with a poor running problem diagnosed as low compression by another garage. A good check over revealed compression well within spec but the valve clearances were out and the fuel pipes were partially blocked. A good tune up and the bike was running fine but the owner needed a MoT which it did not pass the next 2 pictures will explain why it failed on binding brakes
FRONT BRAKE PISTONS
REAR DRUM BRAKE PIVOT ARM
Nothing a bit of time elbow grease and new seals wont cure but as I have mentioned before brakes need maintenance before they fail ( the rear brake was so bad it would have overheated ). If you had taken your bike in for a service and they had suggested a brake rebuild you may have thought they were overcharging you or trying to but if you were stuck in the alps with seized brakes and a massive repair bill you may see the matter from the other side of the fence or is that brake line.
PS this was one of the caliper mounting bolts !