Hi on one of my work vans after having bearings done the brake shoes were not properly adjusted,ended up chewing all the shoes,back plate, clyinders,pipes the lot cost above 300sqids in parts more than 10 yrs ago.
BTW all bearings have numbers on them so i you get that you can go to a bearing stockest and get what maybe £60 bearings for about £20

a lot of local garages do his and charge full price

terry