This short can cause extreme heating of the flexible brake pipe where it can melt a nearby flexible plastic fuel hose, which could result in an underhood fire.
Service Brakes, Hydraulic — Antilock/Traction Control/Electronic Limited Slip
Some of these vehicles with the key in the "on" position, exhibit a condition in which the antilock brake system (ABS) motor shorts to its case and grounds through a flexible brake fluid pipe.