Radial Tire Lead/Pull Correction - GMC chervolet camaro 1999 Service Manual

3:-64 Tires and Wheels
Important:
• Replacement wheels must be equivalent to the
original equipment wheels in the following ways:
- Load capacity
- Wheel diameter
- Rim width
- Wheel offset
- Mounting configuration
• A wheel of incorrect size or type may effect the
following conditions:
- Wheel and hub-bearing life
- Brake cooling
- Speedometer/odometer calibration
- Vehicle ground clearance
- Tire clearance to the body and the chassis
4. Replace the wheel if the wheel is bent. Replace
the wheel if the wheel/nut boss area is cracked.
Suspension
Identify steel wheels with a 2 or 3 letter code stamped
into the rim near the valve stem. Aluminum wheels have
the code, the part number, and the manufacturer
identification cast into the back side of the wheel.
Radial Tire Lead/Pull Correction
Lead/pull is the deviation of the vehicle from a straight
path on a level road with no pressure on the steering
wheel. Lead is usually caused by the following
conditions:
• Off center belt
• Uneven brake assemblies
• Improper tire and wheel alignment In the front tires
(rear tires will not cause lead)
Tire construction can be a cause of lead in a vehicle.
An example of this is placement of the belt. Off center
belts on radial tires can cause the tire to develop a side
force while rolling straight down the road, and the tire
will tend to roll like a cone.
Use the lead/pull correction table in order to verify that
improper tire and wheel alignment is not mistaken for
tire lead.
Radial Tire Lead/Pull Correction
Step
Action Value(s)
Yes
No
Inspect and repair/replace tire/wheel assemblies for:
• Correct tire pressure.
• Excessive/uneven tire wear.
1 • Correct tire size.
-
-
• Excessive radial/lateral wheel runout.
• Out of balance.
Is action complete? Go to Step2
Inspect and repair front and rear suspensions for:
• Damage.
2
• Excessive wear.
• Loose Components.
-
-
• Excessive wheel bearing play.
Is action complete? Go to Step3
Inspect and repair power steering gear and pump for:
• Damage.
3
• Excessive wear.
- -
• Variable Effort steering for DTCs.
Is action complete?
Go to Step4
4
1. Cross-switch front tire/wheel assemblies.
-
2. Road test vehicle. Does vehicle still lead/pull? Go to Step5 System OK
Does the vehicle lead/pull in the opposite direction?
Refer to
5
-
Measuring
Go to Step6 Wheel Alignment
1. Cross-switch left front tire/wheel assembly with left
6
rear tire/wheel assembly.
-
2. Road test the vehicle.
Does vehicle still lead/pull?
Go to Step 7 Go to Step 8
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