2005 Buick LeSabre Brake Disc

You should use the J 42450-A thoroughly clean any rust or corrosion from the mating surface of the hub/axle flange, clean any rust or corrosion from the mating surface and mounting surface of the brake rotor, inspect the mating surfaces of the hub/axle flange and the rotor, install the brake rotor to the hub/axle flange, install the tire and wheel assembly and lower the vehicle.

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. 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). The on-vehicle brake lathe method is used to bring the LRO to within specifications by compensating for LRO while refinishing the brake rotor.

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. 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). You can not install used correction plates in an attempt to correct brake rotor assembled lateral runout (LRO) and can not20 stack up, or install more than one correction plate onto one hub/axle flange location, in an attempt to correct brake rotor assembled LRO.

If at any time the brake rotor exceeds the minimum allowable thickness after refinishing specification, the brake rotor must be replaced. If the brake rotor assembled LRO measurement still exceeds the maximum allowable specification, you should refer to Brake Rotor Assembled Lateral Runout (LRO) Correction. If the brake rotor assembled LRO is within specification, you should install the brake caliper and depress the brake pedal several times to secure the rotor in place before removing the J45101-100 and the lug nuts.

You should remove the J45101-100 and the lug nuts that were installed during the assembled LRO measurement procedure, inspect the mating surface of the hub/axle flange and the brake rotor to ensure that no foreign particles or debris are remaining, index the brake rotor in a different orientation to the hub/axle flange, hold the rotor firmly in place against the hub/axle flange and install one of the J45101-100 and one lug nut onto the upper-most wheel stud, continue to hold the rotor secure and tighten the lug nut firmly by the hand and install the remaining J45101-1OO and lug nuts onto the wheel studs and tighten the nuts firmly by the hand in a star-pattern.