... has many applications. Has Line-In & Line-Out and comes with standard 3/16" brake line fittings & installation instructions. Black ... to use: Just step on the brakes, push in the knob on the Brake Lock, and let ... . NOTE: Not recommended as an emergency brake.Line pressure holds the brakes which is best for ... short term use Hydraulic BRAKE LOCK,LINE LOCK, Line pressure holds brakes,Cars,Trucks,Disc,Drum