Technical data

69
By activating the ESP influences (via the ESP
button or in low range operation), a so-called
off-road ABS is activated.
This controls the brake pressure at the front
axle when wheel slip increases. The off-road
ABS is available up to speeds of 60 km/h.
To maintain driving stability, the rear wheels
are braked as a feature of the standard set-up.
The illustration shows ABS braking in deep
snow. Increasing wheel slip at the front axle
by approx. 15% significantly increases
deceleration and reduces the braking
distance.
The off-road ABS is automatically activated
when the additional shift stage is activated.
TCS function deactivated
As is already familiar, if the ESP button
has been actuated, the TCS functions are
deactivated.
Situations in which increased wheel slip can
be advantageous:
• When driving on soft surfaces or in deep
snow.
• When driving with snow chains.
• When rocking free a vehicle which has
become stuck.
Off-road ABS
When braking on a soft surface, the
significantly higher wheel slip and the
“wedge” of material formed in front of the
wheels reduces the braking distance.
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Standard ABS
Deceleration 2.4 m/s
2
Slip at the front axle approx. 10%
Time in seconds Time in seconds
Speed in km/h Speed in km/h
Off-road ABS
Deceleration 3 m/s
2
Slip at the front axle approx. 25%
average slip average slip
Wheel speed, front left
Wheel speed, front right
Wheel speed, rear left
Wheel speed, rear right
241_100
Reference speed