Originally Posted by
scn
I don't know about WRC, but the Wilwood A, the Carbone Lorraine RC6 and the OMP pads I have experience with do not need any warming up. They work from 100 degrees Celsius and the amazing Carbone Lorraine from ambient temperature. The Ferodo DS3000 need some slight warming to 250 degrees, but one or two hard brakings are enough. Only the old Ferodo DS11 needed significant warming-up, but these are not produced anymore.
The big danger is the tyres. Especially on slippery tarmac, cold tyres are hell. Use of handbrake on straights and braking are preferred for warming up the tyres because it is much less provocative to brake than to do slaloms on public roads. As far as I know, this method started in France because the French police gave lots of fines for slaloms. So French drivers started using the brakes and the handbrake on straights, which is not illegal, and they avoided the fines. In Greece we use the handbrake and the brakes only when warming up is done in populated areas. In all other areas slaloms are the standard method, even in front of police.