Whether you're towing downhill or you want to keep your vehicle straight in the staging lanes on the drag strip, line locks are a must. This relatively simple to install system (about an hour with basic hand tools) will allow you to lock/unlock your front or rear brakes at will. The Granatelli line lock kit features a rebuildable, nickel-plated solenoid valve, a shifter-mountable activation switch, arming light, stainless steel inserts, and black chromate heat sinks.