Just got my A6 back from its MOT that it passed with no issues.

It's a Bi Turbo 3.0 one with the oversized front brakes.

It also had its end of warranty check at the original dealer and what was strange was the rear discs were noted as 80% worn, pads at 50% and recommendation of replacement. The car has done just under 22k miles.

It had a service done at a different dealer in March at just over 19k miles and the front and rear pads were noted as 25% worn with nothing for the discs. I have checked to see if they have a record of the disc thickness and am awaiting to hear back.

Is this normal? No mention of warping but it seems very odd? They are not seized either?

Could they have got the wrong thickness of the discs and worked it out wrongly?

Any ideas?