Those that aren’t drag racers may have no idea what the electronic line lock feature Ford has added to the 2015 Mustang GT is for. A line lock is a tool that locks the front brakes of the car to keep it in place while the rear wheels spin.
Typically, a line lock is used to heat up the rear tires at a drag strip for a better launch. I’m sure in the case of the new Mustang, many a parking lot burnout will be performed with the tool. When the line lock is activated, the driver presses the brake pedal and only the front brakes lock.
This allows the rear wheels to spin and the driver can do a perfect burnout. Doing a good burnout is harder than you might think, just checkout all the burnout fail videos on YouTube for proof. The biggest catch with this feature comes in this little Ford disclaimer: “Electronic line-lock for 2015 Mustang GT is intended for use only on racetracks. Racing your vehicle will void your warranty.”