Vehicle Handbrake problem

Hi i got problem with handbrake and sound in vehicle

  1. i`m create a Input Handbrake
  2. set on PRESS - PLAY SOUND (loop)
  3. set on RELEASE - STOP SOUND

so my main problem is how create logic with float speed (tick)

pressed handbrake = stop sound when speed = 0 , but handbrake must be set still to true ? and should be working on speed above 0… and -0 on reverse gear help?