I have own a corolla altis car after two weeks from delivery date i have complained about large quantity of carbon deposit on the alloy wheels. The dealer neglected by saying it is not a fault. after 5000 KM. of running i again said the same complaint which i have seen increasingly. They have done break drum skimming and replacement of break pads the problem still persists.
when informed about this, they said no problem it will not harm your car's performance, if so, Iam still suffering the problem company like toyota should not make such faulty cars to cheat their customers.