Mohamed... Tech In Training ??? Dont take this personally, but... Tech In Training ???Im shocked at your response...If you are truely in training, if you are in a trade school, you need a new teacher. if you are working in the field,, you need a new shop forman. If you are just a "wanna be",, quit thinking about becoming one, go back to school and learn something else.. Being a technician is just not worth it nowadays.. The pay sucks, your costs are high and respect given is worse then being a lawyer...Now that Ive probably hurt your feelings,,get Over it !!! Lesson Time, pay attention.. camber is the inclination of the tire vertically,, what you want to achieve is a neutral up and down situation,, this means equal measuements from the top of the tires to the bottom.. If you lower a vehicle,, the top of the tire measurement is smaller then the botton,, causeing inner tire wear,, Will it cause a vibration??? Thats your first test question...Caster...Is the angle of your steering knuckle,determined by the relationship of your upper control arm as compared to your lower control arm..We are looking for a tilt forward for steering stability, idealy your right front should lead you left from by a half a degree to compansate for a road crown.. So please tell me,, how camber and caster can possible cause a vibration problem ??Im really forward to your response..By the way,, Im always looking for educated people that want to learn the new Automotive Business the right way... Respectfully.. Lager