12 Vehicle brake rotors having wear indicators; end plugs and distributors for use in vehicle brake systems; component parts of vehicle clutches; vehicles and structural parts thereof; brake systems and parts thereof, namely electronic parking brakes, active parking brakes and vehicle immobilizers; wheel brake systems, electromechanical brake systems, electrohydraulic, hydromechanical, electromechanical and hydraulic wheel brakes and parts thereof, comprising cylinders, brake shoes, brake paste, flexible tubes, hydraulic, pneumatic and electric boosters, containers, valves; mechanical, electric, hydraulic adjusting elements in the nature of brake dampers and especially calipers, brake drums, wheel brake cylinders, brake pads, brake disks, brake hoses, master cylinders, brake boosters, adjustable brake pedals; controlled and uncontrolled, electromechanical as well as electrohydraulic steering units and parts thereof; wheels with tires on them and devices for mounting tires on wheels, especially wheel suspensions and parts thereof; controlled and uncontrolled chassis, spring systems for wheels and parts thereof, namely, air springs or gas springs, air supply units for vehicles; active and passive, controlled and uncontrolled shock absorbers and struts; axles and axle modules for vehicles; electric motors for vehicles