Back Brake grinding at low speed

[SteveT]

Good morning, can anyone confirm if there is a problem with rear brakes

Bought a brand new Audi A3 from the main dealership in May.  Since day one I have had a squeak  and grinding noise on the rear brakes when running at low speed, less than 10 mph in traffic..

The car has been back into Audi three times .

First time mechanic test drove the car with me , said he couldn’t believe how noisy the brakes were , but said they was no problem…?

second time, they so called cleaned and re greased the rear brakes, which lasted about thirty miles

Third time dealership, said the pads had Glazed, of which they replaced, at no cost to me, but the noise was back within a couple days…???? 
 
I would much appreciate, if anyone could shed some light on this..? 
many thanks.