- Prior to inspecting the ball joints for wear, inspect the wheel bearings. Install a new wheel bearing as necessary. REFER to: Front Wheel Bearing and Wheel Hub
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NOTE:
In order to obtain accurate measurements, the suspension must be in full rebound with the weight of the vehicle supported by the frame.
- Inspect the ball joint and ball joint boot for damage.
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NOTE:
Do not use any tools or equipment to move the wheel and tire assembly or suspension components while checking for relative movement. Suspension damage may occur. The use of tools or equipment will also create relative movement that may not exist when using hand force. Relative movement must be measured using hand force only.
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NOTE:
In order to obtain an accurate measurement, the dial indicator should be aligned as close as possible with the vertical axis (center line) of the ball joint.
 Courtesy of FORD MOTOR COMPANY
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- Measure the ball joint deflection while an assistant pushes up and pulls down on the lower control arm, by hand.