Play detectors or Shaker Plates are hydraulically operated devices that are fitted to a vehicle lift or inspection pit.
The wheel play detectors are used by mechanics to check for wear and play in suspension and steering joint components. To do this, they move the wheel in different directions.
Play detectors are used for use in one-man testing. Shaker Plates test the vehicle steering and suspension and are available as standalone items, which can be used with pit-based ATL bays, or you have the option of adding it to your current lift.
Play detectors are an essential part of automated testing.
A wheel play detector can detect when the car is out of alignment and shake the wheel to correct it.