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Wheel Alignment refers to an
adjustment of a car's suspension.

The thrust angle (as shown in the diagram above) is an imaginary line
drawn perpendicular to the rear axle's center-line.
It compares the direction that the rear axle is aimed with.

Looking at a car from above, you would draw the thrust line
perpendicular to the rear axle.
This identifies the direction in
which the rear wheels want to roll.

If the thrust angle aims to the right, this is called a positive
thrust angle.

If the thrust angle aims to the left, this is negative thrust angle.

A positive thrust angle will try to steer the vehicle to the left, while a
negative thrust angle will try to steer the vehicle to the right.

Wheel alignment is also referred to as tracking.
It is not an adjustment of the tires or the wheels themselves.
The key to proper alignment is adjusting the angles of the tires
which affects how they make contact with the road.

Three basic angles contribute to proper wheel alignment:
camber, caster, and toe.

Camber is the angle of the front tires when viewed from the
front of the car.
When the angle of the tire slants away from vertical in either
direction, it can be a sign of misalignment.

When your car's suspension and all of the steering components are
lined up and straight, the wheels are aligned.

Even so, it's a good idea to have yo
ur alignment checked once a
year.

Getting a tire rotation at the same time is also recommended
.

Your mechanic will typically recommend doing the wheel
alignment every 2 - 3 years.
The wheel alignment is also recommended when new tires
are installed.

If you experience any of the following problems, check
with your mechanic for an alignment inspection:

Your steering wheel is not straight when driving on a level road.

You hear unusual noises in your suspension system.

The car is pulling to the right or left when traveling in a straight line
or
when braking.

You feel vibration in the steering wheel or through your vehicle's
seat.

You haven't had a wheel alignment in a long period of time.

Your tires are wearing unevenly.

Squealing tires on turns.

The steering wheel does not return easily after a turn.

Correct alignment is critical to safely controlling your vehicle,
braking stability, extending tire life, and ensuring a comfortable
ride.