No, so long as they aren't on a drum brake system
Loads of them deteriorate, and if they are goosed I remove what I can.....had quite a few rubbing on the disc creating scraping noises!
John
Agreed, they do let the side down!
Trouble is, on some makes the hub has to come off to access the bolt heads, which is a bit of a bore - and they are often just a dealer part too.
John