Road Test
Road TestA road test is mandatory for any customer concern of noise/vibration that is not verified by the on-hoist check of chassis components. The Vehicle Road Test Evaluation form is arranged to record the conditions heard or felt during this test.
The road test form lists 4 operating conditions or modes in which some axle noises come and go: DRIVE, CRUISE, COAST and FLOAT.
Operate the vehicle in all 4 modes and record those in which the noise occurs. Write down the kilometers-per-hour (miles-per-hour) range at which both noise and vibration occur. If equipped with AWD, rear axle evaluations should be done on straight road sections.