Dry Braking
The water spray produced in wet conditions coats the brake discs with a water film, caus-
ing delayed response of the brakes. In connection with previous systems it was therefore
recommended to operate the brakes from time to time.
The dry braking function is dependent on the position of the wiper switch and therefore
on the signal of the rain/lights sensor. The brake discs are kept dry by lightly applying the
brake pads cyclically as required, this achieving improved braking response in wet condi-
tions.
While doing so, the pressure in the brake system is increased by approx. 1 bar and the
brake pads are applied for approx. 1.5 seconds.
Dry braking takes place under following conditions:
• Driving speed > 70 km/h
• Continuous wipe operation in stage 1 or 2
The repeat interval depends on the wiper stage:
• Continuous wipe stage 1 - 200 s
• Continuous wipe stage 2 - 120 s
• Generally 90 s as from 09/2005
This applies only when the driver himself does not apply the brake during this time.
The driver notices no deceleration or noise.
30
E61 Sports Wagon
Left disc with water film before dry braking Right brake disc after dry braking
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