A golf cart includes a cart body, a rotatable freely joint means, and a braking means. The braking means further comprises at least one first buckling element, at least one second buckling element, at least one confining element which is installed between the bushes and the sleeve and can freely move axially therebetween, and a control means. When the button is released, the elastomer is released so that the confining element is pushed to the bush. Thereby, the bush of the joint means rotates with respect to the sleeve freely. The first joint and the second joint can be operated to expand or close the golf cart. When the button is tightened, the bushes can not move with respect to the sleeve.