I don't think 4wd is a must have . But it does put two more driven wheels on the road.
Example would be in slippery conditions you avoid excessive braking pressure and would change down a gear to help the car slow. With 4WD you have four wheels taking the transmitted resistance through the drive train. This will bring you to a stop more quickly and with less brake pressure.
The opposite of this would be to knock the car into neutral and then try and stop. You would be completely reliant on the brakes.
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Current car.M240i.
Previous.MINI JCW. E92 325i. 435d M235i.M135i. 635d Coupe, E92 M3 manual, E92 M3 DCT Competition Pack. E92 335i, Porsche Cayman S Gen2, 135i Coupe. E92 320d, MK5 R32. MK5 Golf GTi,MK5 Golf GT-TDI,E46 318Ci.
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