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
. |
• | 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 rotor assembled
LRO to within specifications. Determine which method to use for the specific 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 correction plate method of correcting assembled LRO involves the addition
of a tapered plate between the brake rotor and the hub/axle flange. The correction
plate method can be used to correct LRO that exceeds the specification by up to 0.23 mm
(0.009 in). Refer to
Brake Rotor Assembled Lateral Runout Correction - Correction Plates
. |
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.