Checking Front Toe Angle

Fig 1: Checking That Instruments Are Adjusted In Relation To Each Other On Front And Rear Axles

Courtesy of VOLVO CARS OF NORTH AMERICA.

Check that the instruments are calibrated to one another on the front and rear axle. This is extremely important in order to be able to adjust toe angle of the front wheels in relation to the car's thrust line (geometrical driving axis).

The thrust line is the line created when the toe-in angles for the rear wheels are equally divided (see the illustration). The difference between the symmetry line of the wheels and the thrust line is called the thrust angle. The thrust angle must not deviate by more than a maximum of 0° ± 0.25° from the symmetry line of the wheels.

Check: 

• the symmetry line of the wheels
• the thrust line
• the thrust angle.

Fig 2: Checking Symmetry Line Of Wheels, Thrust Line, And Thrust Angle

Courtesy of VOLVO CARS OF NORTH AMERICA.