In January 2013 Audi said:
"Audi has responded to technical problems with the brakes at the top models Audi RS3 and TT RS and offers a free brake replacement on a modified brake system.
Once customers have been complaining about a half years delayed braking in the wet, stuttering, loud squeak and high wear, the manufacturer has redesigned the brake system on both models. Stephan Reil, Head of Development at quattro GmbH in Neckarsulm, where RS3 and TT RS will be built, and Florian Heuberger, Head of Technology at Audi Service, announced in Auto Motor und Sport that the operator of the affected vehicles can free replacement of the brakes. Affected up to 5700 models of the RS3 from model year 2011 and 6100 TT RS from model year 2010.
Exchange for parts availability from March
"All customers will be helped - free", Quattro Manager Reil insured against auto motor und sport. Audi has modified the brake caliper and the brake pads to eliminate the most common and occur mainly at low speed squealing when braking. The delay in braking effect when wet Audi plans get through a software update in the handle. "An increased since June 2012 and employed in the service aufspielbares ESP update the frequency with which after turning on the windshield, the brake pads are always easily placed on the discs to displace splash," said Quattro development chief Reil. To reduce the thermal load on the RS3-brake, since June 2012 protects the right of the front apron a breathable pinhole built in, which is also upgradeable."
While last year the then MD of Audi UK wrote to inform me:
"Eliminating the root cause was what we were aiming for and as such we changed the design of the brake callipers. Two precisely specified mass dampers were added along with a modified pad back plate â by cutting in half-moon shaped recesses. The mass dampers modify the frequency (formerly felt as an annoying squeal) so it will no longer be audible. The recess in the back plate slightly angles one pair of the calliper pistons to eliminate the play inside the calliper bore holes which before has led to vibrations and consequently to undesired noise."
And that's why I had the 47i6 upgrade done.!
So any of you guys that have NOT had the 47i6 upgrade done on your car then I'd strongly recommend you read the January 2013 statement (as published in Von Auto Motor und Sport) and get yours done.
PS: I and another RS3 owner have experienced low speed/light pedal load brake squeal with the 47i6 upgrade but both of us have since resolved the issue.