Brake dics thickness-fronts

[stressfrees3]

Hi Guys

Just had my MOT on the S3 and they suggest that discs need changing at the next pad change. Does anyone knoe what thickness the discs should be before changing? What suggestions do fellow drivers have for new disc and pads. I have had black diamonds grooved before and seemed OK

Many thanks

 

[Corey]

the wear limit is 23mm on the 25mm thick S3 disc.