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:
Traction Control/ Electronic Stability Control
The Traction Control System (TCS) limits wheel spin. The system is on when the
vehicle is started.
The StabiliTrak system assists with directional control of the vehicle in difficult
driving conditions. The system is on when the vehicle is started.
To turn off traction control, press and re ...
Repairs and Inspections Required After a Collision
Accident With or Without Air Bag Deployment ?€“ Component Inspections
Warning: Proper operation of the Supplemental Inflatable Restraint
(SIR) sensing system requires that any repairs to the vehicle structure
return the vehicle structure to the original production configur ...
Clutch System Description and Operation
Clutch Spin Down Time
Inspect the clutch spin down time as follows:
Apply the parking brake and block the vehicle wheels.
Shift the manual transmission into NEUTRAL.
Start the engine. Run the engine at idle speed.
Engage the clutch.
Disengage the clutch. Wait 9 seconds.
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