Sierra 1500 2WD V6-4.3L (2008)
Brake Rotor/Disc: Testing and Inspection
Brake Rotor Assembled Lateral Runout Correction
Brake Rotor Assembled Lateral Runout Correction
Important:
*
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 (See: 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 (See: Brake Rotor Assembled Lateral Runout Measurement) .
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.
*
Brake Rotor Assembled Lateral Runout Correction - Indexing (See: Brake Rotor Assembled Lateral Runout 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 in). Indexing is used to achieve the best possible match of high spots to low spots between related components.
*
Brake Rotor Assembled Lateral Runout Correction - On Vehicle Lathe (See: Brake Rotor Assembled Lateral Runout 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.
Brake Rotor Assembled Lateral Runout Correction - Indexing
Brake Rotor Assembled Lateral Runout Correction - Indexing
Tools Required
*
J 39544-KIT Torque-Limiting Socket Set, or equivalent
*
J 45101-100 Conical Brake Rotor Washers
Caution: Refer to Brake Dust Caution .
Important:
*
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 (See: Brake Rotor
Thickness Variation Measurement) .
*
Brake rotor assembled 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 (See: Brake
Rotor Assembled Lateral Runout Measurement) .
