Automobile Engineering in ME
The basic purpose of a four wheel drive (4WD) system is that it

Ensures effective transmission of engine torque to all four wheels, even on slippery road surfaces
Eliminates the need of snow tyres, tyre chains, etc.
Delivers improved cornering on dry road surfaces
Ensures that effective braking can be performed, even on slippery surfaces

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Automobile Engineering in ME
Incorrect steering axis inclination (S.A.I.) causes

Poor recovery of the steering wheel after making a turn
The vehicle to pull to the side of lesser inclination
Generation of a braking effect at tight corners
Tendency to assume toe-out orientation

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