A vibration monitor is mounted on a vehicle for monitoring vibrations in
the axles and wheels of the vehicle which may indicate some type of
failure associated with the wheels. The monitor includes sensors mounted
on the axles which are connected to a control box for disabling the
vehicle in response to receipt of a vibration signal from the sensors. The
control box is arranged to vent the air brake circuit of the truck for
applying the brakes of the truck if the control box receives a vibration
signal from the sensors having a magnitude which exceeds an acceleration
threshold and a duration which exceeds a time threshold determined by the
control box. In one embodiment, electrical acceleration sensors are
provided which transmit the vibration signals to the control box using an
intermittent RF signal having a unique identification signal for
indicating which sensor has recorded each vibration signal.
