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Vehicle Leads/Pulls

Step

Action

Yes

No

DEFINITION: At a constant highway speed on a typical straight road, lead/pull is the amount of effort required at the steering wheel to maintain the vehicle's straight path.

1

Did you review the General Description and perform the visual/physical inspections?

Go to Step 2

Go to Symptoms - Suspension General Diagnosis

2

Road test the vehicle in order to verify the complaint.

Does the vehicle operate normally?

System OK

Go to Step 3

3

Inspect the tyre/wheel assemblies for the following conditions:

    • Correct tyre pressure--Refer to the tyre placard.
    • Correct tyre size--Refer to the tyre placard.
    • Abnormal tire wear or damage

Did you find and correct the condition?

Go to Step 9

Go to Step 4

4

Perform the Radial tyre Lead/Pull Correction .

Did you find and correct the condition?

Go to Step 9

Go to Step 5

5

Inspect and correct/adjust the suspension and steering systems for the following conditions:

    • Vehicle trim height--Refer to Trim Height Specifications .
    • Excessively worn, loose, or damaged components

Did you find and correct the condition?

Go to Step 9

Go to Step 6

6

Inspect the brake system for brake drag. With the vehicle suspended on a hoist, brake drag can be identified by rotating each wheel several times and observing whether more force is need to rotate the left wheel or the right wheel. Refer to Disc Brake System Diagnosis .

Did you find and correct the condition?

Go to Step 9

Go to Step 7

7

Inspect the wheel alignment and adjust as necessary. Refer to Wheel Alignment Measurement .

Did you correct the condition?

Go to Step 9

Go to Step 8

8

Inspect the steering gear for unequal effort. The vehicle must be suspended on a hoist, the engine running, and the transmission in PARK or NEUTRAL. Grasp the tyre assembly and manually simulate a turn from the left of centre and the right of centre observing whether more force is needed to turn to the left or to the right. If this condition exists replace the steering gear.

Did you correct the condition?

System OK

Go to Step 3

9

Operate the vehicle in order to verify the repair.

Did you correct the condition?

System OK

Go to Step 3

   


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