Silverado 1500 4WD V8-5.3L VIN B HO (2006)
Brake Rotor/Disc: Testing and Inspection
Brake Rotor Assembled Lateral Runout Correction
Brake Rotor Assembled Lateral Runout (LRO) Correction
Important:
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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.
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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).
Review the following acceptable methods for bringing the brake rotor assembled LRO to within specifications. Determine which method to use for
the specific vehicle being repaired.
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Brake Rotor Assembled Lateral Runout (LRO) Correction - Indexing. 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 inch). Indexing is used to achieve the best
possible match of high spots to low spots between related components.
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Brake Rotor Assembled Lateral Runout (LRO) Correction - On-Vehicle Lathe. The on-vehicle brake lathe method is used to bring the LRO to
within specifications through compensating for LRO while refinishing the brake rotor.
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.
