Brake upgrade

A question regarding replacing only the front discs with larger ones. What happens with the weight transfer when braking hard?
Because my colleague put RS3 front brakes on his Audi A3 2.0TDI and what happened then: when braking hard the car was digging the front of the car into the road, but rear was up in the air, very dangerous especially with spirited driving on the country roads. This happened because the braking balance was distorted. And he already had the car completelly lowered.
After that he upgraded also the rear brakes with RS7 rear brakes :) and that was completelly different thing. The whole car just squated and digged completelly into the road and stopped in crazy distances.
According to his experience I would upgrade all four disc, not only front. But it is true that the upgrade was really, really big, so maybe this contributed to the rear in the air.
I have drums at the rear, and there has been no significant effect on the weight transfer evident since the swap has been done.

RS3 brakes are certainly significantly larger again (345mm or more?) and multi-piston, let alone probably having very aggressive pads. I have neither. A 2.0tdi (and I suspect if the brakes are that potent it has probably been given some form of remap as well) will be considerably faster than my A2 and will also weigh a lot more at the front end. Does it also have big / sticky performance tyres and aggressive front shocks with hard springs (the 'completely lowered' comment suggests this to be the case)? All of these will make it more likely to cause further forwards weight transfer if really stamping on the brake pedal.

There are some adjustments for brake balance that can be made in VCDS for the ABS settings to deal with various brake options on some of the more recent Audis - perhaps they need to work on these as well?

Frankly, if they are able to generate enough g when braking to get the rear wheels off the ground it suggests that they are perhaps being a bit enthusiastic on public roads - I am not going to use stronger terms than that in writing.
 
Frankly, if they are able to generate enough g when braking to get the rear wheels off the ground it suggests that they are perhaps being a bit enthusiastic on public roads - I am not going to use stronger terms than that in writing.
No, the rear wheels did not go off the ground, but with only RS3 brakes in front, you could feel the weight transfer to the front and the rear became very light and lively... The small stock rear discs were just not up the more powerfull RS3 brakes. After the swap with RS7 rear brakes at the back, the whole car just squated to the ground and stopped in crazy distance. Really nice (and extremelly expensive) setup ;). Though in line with all the other mods: 300+HP, 600+Nm :).
 
Left and right disk are identival, thus the strange rotation.
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