The present invention discloses a mechanical brake system for decelerating or ending the rotation of a wheel of a vehicle, adapted to eliminate the friction of the brakes with said decelerated wheel in the manner that the braking force is mechanically provided to be lower than the torque force of said wheel so that the locking of the wheel is prevented and the vehicle skid is eliminated. Moreover, a method of preventing a vehicle from skidding and/or for avoiding said vehicle's wheel from locking comprising applying the aforesaid braking system is also disclosed.