Wheel Alignment Test Requirements

Wheel Alignment Test Requirements

Follow the general information regarding vehicle alignment. Refer to => [ Wheel Alignment ] Wheel Alignment.

• Vehicle must be cool.

• Check suspension, steering and steering linkage for excessive play and damage, repair if necessary.

• Tread depth difference may be no more than 2 mm on an axle.

• Prescribed tire pressure.

• Vehicle accurately aligned, suspension bounced and rocked several times.

• Drive the vehicle onto the alignment rack without tension. Move the vehicle back and forth if necessary to relieve any tension on the axle components.

• The steering wheel must be "evened out" into the center position before beginning the measuring and adjusting. Use steering wheel scales (VAS 6458) for this.

• Vehicles with coil spring suspension in curb weight position, "curb weight position means: the vehicle weight (fuel tank full, as well as the windshield washer fluid reservoir for the windshield/headlamp washer system, spare wheel, vehicle tools and vehicle jack) with without the driver."

• Vehicle with air suspension in control position, "control position means: the height position of the vehicle without the driver", refer to => [ Vehicle with Air Suspension, Bringing to Control Position for Wheel Alignment ] Vehicle With Air Suspension, Bringing to Control Position For Wheel Alignment.

• Make sure that the sliding plates and turn tables are not touching the end stop when checking the wheel alignment.

• The measurement sensor must be properly adjusted and attached to the vehicle; observe device manufacturer's operating instructions.

• Perform wheel run-out compensation: Permissible axial run-out of the wheel rims can exceed the specified toe setting tolerance. If compensation for wheel run-out is not performed, it will not be possible to obtain a correct toe-in adjustment.

• Vehicle alignment platforms and the alignment equipment/alignment computers can deviate from their original calibration over time therefore they should be calibrated at least once a year during maintenance.

• Handle highly sensitive units with care.

• If necessary, contact the manufacturer for familiarization with the proper use of the equipment.