I took my car to lexus Cambridge today. They tightened up all suspension components. The pads and discs all round were replaced in January and are OEM parts. Lexus said the car was mechanically perfect. They only problem they could see was some play in the water pump that is being replaced under extended warranty. I am going to take my front brakes apart and copper grease them up again and make sure they are all out together correctly.i may replace the front hardware springs for the sake of £29.