Chevrolet Sonic Repair Manual: Scrub Radius Description
Ideally, the scrub radius is as small as possible. Normally, the SAI angle and the centerline of the tire and the wheel intersect below the road surface, causing a positive scrub radius. With struts, the SAI angle is much larger than the long arm/short arm type of suspension. This allows the SAI angle to intersect the camber angle above the road surface, forming a negative scrub radius. The smaller the scrub radius, the better the directional stability. Installing aftermarket wheels that have additional offset will dramatically increase the scrub radius. The newly installed wheels may cause the centerline of the tires to move further away from the spindle. This will increase the scrub radius.
A large amount of scrub radius can cause severe shimmy after hitting a bump. Four-wheel drive vehicles with large tires use a steering damper to compensate for an increased scrub radius. Scrub radius is not directly measurable by the conventional methods. Scrub radius is projected geometrically by engineers during the design phase of the suspension.
Replacement Wheels Description
Replace the wheel if any of the following conditions exist:
The wheel exhibits excessive runout.
The wheel is bent.
The wheel is cracked.
The wheel is severely rusted.
The wheel is severe ...
Spare Tire Kit Installation
Installation Instructions Part Number
95280943
Procedure
...
Other materials:
Parking Brake Indicator Switch Replacement
Removal Procedure
Remove the front floor console. Refer to
Front Floor Console Replacement.
Ensure that the park brake lever is in the fully released
position.
Disconnect the electrical connector from the park
brake warning indicator switch.
Remove the par ...
Aluminum Wheel Refinishing
Finish Damage Evaluation Procedure
Note:
If the wheels are chrome-plated, do not re-plate or refinish
the wheels.
If the wheels are polished aluminum, do not refinish the wheels
in the dealer environment. Utilize a refinisher that meets manufacturer
...
Turbocharger Removal
Special Tool
EN-49942 Holding Wrench
For equivalent regional tools, refer to Special Tools.
Install the EN-49942 holding wrench (2) to the turbocharger coolant
feed pipe. Guide a ratchet wrench (1) along with an extension through EN-49942
holding wrench to the turbo ...
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