OEM Rear brake disc fail (bearing) in warranty. I bought 2 discs from Renault . Renault service will only change one. In this case, one disc will be thinner. I'm not sure it's up to the Renault standards. One is used 11 month.
All good and reputable garage should know that brake disc goes as a pair otherwise they wouldn't sell them as a pair. Everywhere you go will not sell you a single rear disc. You should ask again for the pair to be change and also ask them the phone number of Renault customer services and explained that you will speak to them about their practise, they might change their ways.
