Originally posted by Klatu
Please don't be like me and ride on them for a month after the wear indicators stop making noise. Then you'll have to replace your master cylinder, calipers, rotors, pads, and possibly a lot more :hs:
While I might be able to come up with a reason for the caliper being replaced in your scenario, what was wrong with the master cylinder? Sounds a bit like overkill (ripoff) by the mechanic.