Chevrolet Sonic Repair Manual: Brake Rotor Assembled Lateral Runout Correction
Note:
- Brake rotor thickness variation MUST be checked BEFORE checking for assembled lateral runout (LRO). Thickness variation exceeding the maximum acceptable level can cause brake pulsation. Refer to Brake Rotor Thickness Variation Measurement.
- Brake rotor assembled lateral runout (LRO) exceeding the maximum allowable specification can cause thickness variation to develop in the brake rotor over time, usually between 4,800–11,300 km (3,000–7,000 mi). Refer to Brake Rotor Assembled Lateral Runout Measurement.
Review the following acceptable methods for bringing the brake disc assembled LRO to within specifications. Determine which method to use for the vehicle being repaired.
- The indexing method of correcting assembled LRO is most effective when the LRO specification is only exceeded by a relatively small amount: 0.025–0.127 mm (0.001–0.005 in). Indexing is used to achieve the best possible match of high spots to low spots between related components. Refer to Brake Rotor Assembled Lateral Runout Correction - Indexing.
- The on-vehicle brake lathe method is used to bring the LRO to within specifications through compensating for LRO while refinishing the brake rotor. Refer to Brake Rotor Assembled Lateral Runout Correction - On Vehicle Lathe.
If the assembled LRO cannot be corrected using these methods, then other components must be suspected as causing and/or contributing to the LRO concern.
Brake Rotors
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Brake Rotor Assembled Lateral Runout Correction - Indexing
Special Tools
CH-45101-100 Conical Brake Rotor Washers
For equivalent regional tools, refer to Special Tools.
Warning: Refer to Brake Dust Warning.
Note:
Brake ro ...
Other materials:
Rocking the Vehicle to Get it Out
Turn the steering wheel left and right to clear the area around the front wheels.
Turn off any traction system. Shift back and forth between R (Reverse) and a low
forward gear, spinning the wheels as little as possible. To prevent transmission
wear, wait until the wheels stop spinning before s ...
Airbag Steering Wheel Module Coil Centering
Note: If a double wire harness strap is installed onto the wire
harness assembly and steering column, the original holder for the wire strap(s)
MUST be reused during installation.
Remove the wire harness strap(s) where necessary.
Caution: The new SIR coil assembly will ...
Airbag Roof Side Rail Module Replacement - Rear
Airbag Roof Side Rail Module Replacement - Rear
Callout
Component Name
Warning: In order to prevent SIR deployment, personal injury,
or unnecessary SIR system repairs, do not strike the door or the door
pillar in the ...
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