Tracker 4WD L4-2.0L VIN C (1999)
Toe is a measurement of how much the front and/or rear wheels are turned in or out from a straight-ahead position. When the wheels are turned in, toe
is positive When the wheels are turned out, toe is negative The actual amount of toe is normally only a fraction of a degree. The purpose of toe is to
ensure that the wheels roll parallel. Toe also serves to offset the small deflections of the wheel support system that occur when the vehicle is rolling
forward. In other words, with the vehicle standing still and the wheels set with toe-in, the wheels tend to roll parallel on the road when the vehicle is
moving. Improper toe adjustment will cause premature tire wear and cause steering instability.
Thrust Angle Description
The front wheels aim or steer the vehicle. The rear wheels control tracking. This tracking action relates to the thrust angle (3). The thrust angle is the
path that the rear wheels take. Ideally, the thrust angle is geometrically aligned with the body centerline (2).
In the illustration, toe-in is shown on the left rear wheel, moving the thrust line (1) off center. The resulting deviation from the centerline is the thrust
angle.
General Description
The wheel alignment refers to the angular relationship between the wheels, the suspension attaching parts, and the ground. To achieve the desired
handling characteristics of a vehicle under various operating conditions, modern steering geometry relates to both the front and the rear suspension
systems. It must also be realized, that the various measurable angles that can be checked while the vehicle is stationary is not a real indication of the
changes that occur in a dynamic situation. Even though some of the following descriptions may not be adjustable, each is an inherent part of the
vehicle's suspension tuning. Perform a complete wheel alignment check when a service check is necessary. This check includes the measurement of all
four wheels. When the vehicle is geometrically aligned, fuel economy, tire life, and steering performance are increased.
Lead/Pull Description
Lead/Pull is the deviation of the vehicle from a straight path, on a level road, without hand pressure on the steering wheel. Lead/Pull is usually caused
by the following:
-
Tire construction
-
Uneven brake adjustment
-
Wheel alignment The way in which a tire is built may produce lead/Pull. The rear tires will not cause lead.
Memory Steer Description
Memory steer is when the vehicle wants to lead or pull in the direction the driver previously turned the vehicle. Additionally, after turning in the
opposite direction, the vehicle will want to lead or pull in that direction.
Scrub Radius Description
