Mercedes-Benz GLA 250 2019 Operator's Manual page 343

Vehicle data for off-road driving
341
If the load on the front axle is reduced when
pulling away on a steep uphill slope, the front
wheels have a tendency to spin. 4ETS recogni-
zes this and brakes the wheels accordingly.
The rear wheel torque is increased, making it
easier to drive off.
For further information about the maximum
gradient climbing ability, see ( page 156).
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