Causes of Jackknife:

  • Ice on Curve
  • Over Acceleration
  • Over braking
  • Over turning too sharp
  • Unbalanced air brake timing
  • Load shifting or a poorly balanced load
  • Driver panic or slow reaction time
  • Driving too fast for conditions
  • Tire conditions
  • Use of hand valve
  • Windy conditions
  • Downshifting on slippery surfaces
  • Improper use of Jake brake or misuse of Jake brake

How to avoid a Jackknife ?

  • Plan routes
  • During pre-trips make sure ALL brakes are adjusted properly
  • Don't drive when fatigued
  • Never use the hand valve
  • Watch your mirrors when slowing or stopping
  • Don't use the Jake brake, except on dry roads
  • Be aware of changing weather and road conditions
  • Avoid over acceleration, drive smoothly
  • Brake before a turn, not during the turn.
  • Go easy on the service brake when slowing down
  • Steer smoothly

What to do when you feel like your vehicle is starting to slide?

  • Get off the throttle or the brake.
  • Push the clutch in.