Power Brake Assist: Description and Operation

Brakes

Brake booster

The Cayenne and Cayenne S variants are equipped with a tandem brake booster (9/10-inch diameter) with a transmission ratio of i=7. The transmission ratio on the Cayenne Turbo is i= 8. Compared with the previous model, this is now a normal brake booster, i.e. the brake light switch and booster coil have been omitted.