Why are the radiator braking all the time on the T16, and is the same one homologated on the Ds3?

To bad with the brake issues for Petter Kristiansen in the Fabia R2 on the first day, if not he might be fighting for 2nd. Not bad with an old car, but with new pieces in the back axle!
Seems ERC Juniors is a good series to start the international training!