Chevrolet Equinox Service Manual: Brake Rotor Assembled Lateral Runout Measurement Disc Brakes Brake Rotors

Special ToolsCH-41013 Rotor Resurfacing KitCH-42450-A Wheel Hub Resurfacing KitCH-45101 Hub and Wheel Runout GaugeCH-45101-100 Conical Brake Rotor Washers

For equivalent regional tools, refer toSpecial Tools.

Warning:Refer toBrake Dust Warning.

Note:

Brake rotor assembled lateral runout (LRO) exceeding the maximum allowable specificationcan cause thickness variation to develop in the brake rotor over time, usually between4,800–11,300-km (3,000–7,000-mi).Brake rotor thickness variation MUST be checked BEFORE checking for assembled lateralrunout (LRO). Thickness variation exceeding the maximum acceptable level can causebrake pulsation. Refer toBrake Rotor Thickness Variation Measurement.Matchmark the position of the brake rotor to the wheel studs if this has not beendone already.

Note:Whenever the brake rotor has been separated from the hub/axle flange, any rust orcontaminants should be cleaned from the hub/axle flange and the brake rotor matingsurfaces. Failure to do this may result in excessive assembled lateral runout (LRO)of the brake rotor, which could lead to brake pulsation.

Inspect the mating surface of the hub/axle flange and the brake rotor to ensure thatthere are no foreign particles, corrosion, rust, or debris remaining. If the wheelhub/axle flange and/or if the brake rotor mating surfaces exhibit these conditions,perform the following steps:Remove the brake rotor from the vehicle. Refer toFront Brake Rotor Replacementand/orRear Brake Rotor Replacement.Using the CH-42450-A wheel hub resurfacing kit, thoroughly clean any rust or corrosion from the mating surface of the hub/axle flange.Using the CH-41013 rotor resurfacing kit, thoroughly clean any rust or corrosion from the mating surface of the brake rotor.Clean the friction surfaces of the brake rotor with denatured alcohol, or an equivalentapproved brake cleaner.Install the rotor to the hub/axle flange using the matchmark made prior to removal.

Hold the rotor firmly in place against the hub/axle flange and install one of thCH-45101-100 conical brake rotor washers-(1), and one lug nut-(2)-onto the upper-most wheel stud.Continue to hold the rotor secure and tighten the lug nut firmly by hand.

Install the remaining CH-45101-100 conical brake rotor washersand lug nuts onto the wheel studs and tighten the nuts firmly by hand in a star-pattern.Tighten the lug nuts in a star-pattern to specification. Refer toTire and Wheel Removal and Installation.If the brake rotor has been REFINISHED or REPLACED with a new rotor, proceed to step-14.If the brake rotor meets the following criteria, proceed to step-10.The rotor is within specifications and is being REUSED.The rotor has NOT been refinished.The rotor does NOT exhibit thickness variation exceeding the maximum allowable level.

Mount a dial indicator, CH-45101 hub and wheel runout gauge, or equivalent, to the steering knuckle and position the indicator button so it contactsthe brake rotor friction surface at a 90-degree angle, approximately 13-mm (0.5-in)from the outer edge of the rotor.Measure and record the assembled LRO of the brake rotor.Rotate the rotor until the lowest reading is displayed on the indicator dial, thenset the dial to zero.Rotate the rotor until the highest reading is displayed on the dial.Mark the location of the high spot relative to the nearest wheel stud, or studs.Measure and record the amount of LRO.Compare the brake rotor assembled LRO to the following specification:

Specification

Front brake rotor maximum allowable assembled lateral runout: 0.05-mm (0.002-in)Rear brake rotor maximum allowable assembled lateral runout: 0.05-mm (0.002-in)If the brake rotor assembled LRO is within specifications, proceed to step-18.

If the brake rotor assembled LRO exceeds the specification, refinish the rotor toensure true parallelism. Refer toBrake Rotor Refinishing. After refinishing the rotor, proceed to step-14.

Mount a dial indicator, CH-45101 hub and wheel runout gauge, or equivalent, to the steering knuckle and position the indicator button so it contactsthe brake rotor friction surface at a 90-degree angle, approximately 13-mm (0.5-in)from the outer edge of the rotor.Measure and record the assembled LRO of the brake rotor.Rotate the rotor until the lowest reading is displayed on the indicator dial, thenset the dial to zero.Rotate the rotor until the highest reading is displayed on the dial.Mark the location of the high spot relative to the nearest wheel stud, or studs.Measure and record the amount of LRO.Compare the brake rotor assembled LRO to the following specification:

Specification

Front brake rotor maximum allowable assembled lateral runout: 0.05-mm (0.002-in)Rear brake rotor maximum allowable assembled lateral runout: 0.05-mm (0.002-in)If the brake rotor assembled LRO measurement exceeds the specification, bring theLRO to within specifications. Refer toBrake Rotor Assembled Lateral Runout Correction.If the brake rotor assembled LRO measurement is within specification, install thebrake caliper and depress the brake pedal several times to secure the rotor in placebefore removing the CH-45101-100 conical brake rotor washersand the lug nuts.