Overview

Wheel Alignment Basics Wheel alignment is measuring and setting the wheels, relative to the vehicle and each other, to get the best overall handling and tire performance possible. Since the wheels are held in position by the vehicle’s suspension and influenced by the steering system, it is important that these two systems and chassis height be inspected prior to alignment.  Chassis Height What is it?  A measurement generally made between the floor and a specified point on the vehicle to assure that the chassis components are moving within a range designed by the engineer to allow good handling, ride and parts/tire life. What does it effect? Chassis height is the foundation for caster, camber and toe angles. If out of specification, chassis height accelerates parts and tire wear, and can cause an inability to obtain or maintain desired alignment settings. A lack of camber adjustment range in the system is often a result of incorrect chassis height. How is it inspected?  Level ground, a tape measure, proper tire size and inflation, and a vehicle height manual are required.
		Vehicle inspection should begin with chassis height measurement: • Check for loads in vehicle • Check for proper tire size/pressure Do not lift vehicle prior to measurement.
	Alignment specifications, including chassis height, can be found in the CARQUEST Chassis Specs Guide.

 
Wheel Alignment Basics

Reasons for an alignment:

• Tire wear
  Abnormal tire wear is noticed by the customer or technician.
• Vehicle does not handle well
  Customer complains of pull or other handling problem.
• Periodic maintenance
  Alignment checks are recommended by most vehicle manufacturers at specific intervals.
• Parts replacement
  An alignment check is recommended whenever steering or suspension parts are replaced.
• Preventative Maintenance
  Alignment performed when new tires installed.

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