Make sure you see the pads that are removed, i expect that the only bit of pad touching the disc is at the very outside of the pad and its only touching the wear ridge at the outer edge, it might even only be the wear indicator touching the dis, if fitted.
From your post i'd be surprised if the disc is genuinly bad enough to need renewing, whether that stops them being put on is another question entirely...again iw oudl have your son bring the old parts back.
Kompensayshun is not likely here..:-)))))
As said, its almost impossible to tell how badly worn pads are during an MOT, which also makes a mockery of most modern service techniques at some main dealers, where a technician peers through the and from behind the wheel can see a tiny fraction of the edge of the pads, sprays brake cleaner all over the shop, and then pronounces all well, its rubbish.
Cars need annual proper servicing of the brakes, which means removing the wheels, then the pads and checking them properly, then clean lube and re-assemble.
By the way, if i found my brakes 75% worn, they'd have been binned and replaced there and then, a week at best whilst i gathered the parts in.
Edited by gordonbennet on 22/04/2014 at 14:48
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