The adjustment is on each side of the hub. Take the wheels off and you will see a small rubber gromet on the face of the hub / rotor assembly ,take it out. Get the hole at the middle bottom by spinning the wheel, use a light and youll see a toothed cog wheel. use a screw driver to adjust it vertically down and up. Down tightens it from memory, easiest way is to put the handbrake on about 90% and then adjust both sides tight.