I konw on my Mk2 when my lever used to go right up with no handbrake , i got a large spanner (22mm i think) and moved the arms on the rear calipers (where the hand brake cable is ) up and down , whilst appling some spray grease to the arm area, The adjustment is where the 2 rear cables join the main cable from the hand brake handle, have a look under the car and you will see what i mean