I have a Freelander TD4. 2004. It has been standing for 2 months. When I ran it after this there was a knocking as if something was catching underneath. The faster i go, the quicker the knocking. When i jacked it up to spin each wheel individually to find the source of the 'knocks' the wheels are locked as if in gear. How do i free them so that i can spin each wheel find which is the problem. I suspect a sticking brake shoe, can anyone help?