Runout Check

If the road test has established a front brake shudder condition, the following procedure should be used to isolate the cause:
1. Remove the lug nuts. Before removing the wheel, mark the wheel and one of the lug bolts so that the wheel can be installed in its original position.
2. Examine the condition of the front disc brake rotor and brake pads and linings. If there is visible evidence of lining deposits or light corrosion on the front disc brake rotor, this should be removed using emery paper and a flat block.





3. Install three wheel hub bolt nuts to hold the front disc brake rotor and use Dial Indicator with Bracketry TOOL-4201-C or equivalent to measure the front disc brake rotor runout. Measure the runout about 11 mm (7/16 inch) in from the outside diameter.
4. Rotate the front disc brake rotor. Record the indicator reading. If runout is greater than 0.08 mm (0.003 inch) total indicator reading, the front disc brake rotor should be resurfaced as described.
5. Install the disc brake caliper, brake pads and linings and wheel.
6. Install wheel and tire assembly, using Rotunda Accutorq. Lug Nut Sockets 164-R0303 or equivalent on 1/2 inch drive air impact wrench or torque wrench to tighten lug nuts to 115-142 Nm (85-105 ft. lbs.).

CAUTION: Failure to tighten lug nuts in a star pattern may result In high rotor runout, which will speed up the development of brake roughness, shudder and vibration.

7. Road test to confirm repair.

If a concern remains, use the Symptom Chart in order to isolate it to a specific subsystem and condition description. From this description a list of possible sources can be used to further narrow the cause to a specific component or condition.