Severe strain on the brake system

The brakes will be subject to severe strain when driving in mountains or hilly areas, or when towing a trailer. Vehicle speed is usually slower, which means that the cooling of the brakes is less efficient than when driving on level roads. To reduce the strain on the brakes, shift into a lower gear and let the engine help with the braking. Do not forget that if you are towing a trailer, the brakes will be subjected to a greater than normal load.
See also:
Function
Function overview
1 - Warning light, braking by driver required 2 - Controls in steering wheel
3 - Radar sensor in front grille
Adaptive Cruise Control consists of:
A cruise control system ...
Temporary shut-off of the air conditioning
The air conditioning is momentarily disengaged
during full-throttle acceleration or when
driving uphill with a trailer. This may result in a
temporary increase in cabin temperature. ...
Exterior
Partly because it was designed specifically as a sedan, the S80 looks
dramatically different than its squared-off predecessors. The compact grille
extends forward and is accented by a prominent V ...
