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The description of friction needs some clarification. Presumably the car is rolling, not sliding (skidding). So friction is in the bearing, not where the rubber meets the road, and you will need some radii to convert frictional force to torque to force at the road and resulting deceleration. What is the surface area of the bearing, and how is the weight of the car distributed over that area in each of the four axles? But I think car axles have roller bearings, so even there the concept of friction at the axle is not very clear. Oh, and you say the engine is switched off. Is the car left in gear, or put in neutral to free-wheel? If the former, then is engine braking included in the coefficient of friction? This is a lot more complicated than your normal sliding block problem
