2-15. RELEASE/APPLY PARKING BRAKES (NORMAL) (CONT).
Trailer wheels must be chocked or drawbar connected to truck before coupling trailer
gladhands to truck. Failure to comply may result in injury or death to personnel.
When air pressure is supplied through emergency gladhand, trailer brakes will automatically
release. When emergency gladhand is disconnected, trailer brakes will automatically lock.
Hook up emergency gladhand (3) and push in trailer air supply valve (4) located in truck cab.
Allow trailer air pressure to build up to operating pressure (3 to 5 minutes).
Pull trailer air supply valve (4) out in truck.
Unhook emergency gladhand (3) from truck.
Pull truck forward.