Headlight Aiming

Low beams have a cut-off line that must be at the right height and angle. Many cars have a manual height adjuster; xenon and many LED lights have automatic levelling. Aim is checked with a beam setter during inspections. Load changes the aim: a full boot raises the front of the car, which is why manual levelling dials exist. Set the dial according to the load shown in the owner's manual.

Adjusting screws on the headlight move the reflector or the whole unit up, down and sideways.

Badly aimed lights reduce visibility and can dazzle others. Aim should be checked after replacing a headlight or after a front-end repair.