VW Golf, rear brake discs

I bought a brand new Golf Mark 7 just two years ago. At the last service in November the dealer told me that the car needed new rear brake discs at a cost of just over £ 300.00. I queried this and suggested that discs on a two year old low mileage car was most unusual.
The garage agreed to pay half. The service technician did state that he had seen three Mark 7 Golfs with similar problems.
It would appear that the pads do not have full contact with the disc and thus leave a rusty ring on the disc.
I have since looked at other Mark 7 Golfs and have seem the same proble.
Anyone have a similar experience?

Asked on 29 December 2015 by John Reeve

Answered by Honest John
That's the price of the electric parking brake. The parking brake pads don't have full contact, so the system relies on the full size pads cleaning overnight corrosion from the discs, and that doesn't happen very effectively unless the car is driven and braked fairly hard.
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