SPEED CONTROL SWITCH ON BRAKE MASTER CYLINDER CAUGHT ON FIRE. DAMAGE LIMITED TO SWITCH WHICH WAS UNPLUGGED AFTER FAILURE. SUBSEQUENTLY, BRAKE FLUID HAS LEAKED OUT OF MASTER CYLINDER AT SWITCH PLUG RESULTING IN CORROSION OF BRAKE PARTS INCLUDING BRAKE MASTER CYLINDER AND BRAKE BOOSTER. BRAKES ARE NOW MALFUNCTIONING RESULTING SPONGY PEDAL AND LEFT FRONT CALIPER GRABBING ABRUPTLY AND LOCKING UP CAUSING LOSS OF CONTROL OF VEHICLE WHILE BRAKING WHEN DRIVING ON ANY ROADS IN ANY CONDITION. THE LEAKING FLUID HAS CAUSED CORROSION AND FAILURE OF VARIOUS PARTS INCLUDING MOUNTS FOR ELECTRICAL CONNECTORS AND POSSIBLY ELECTRICAL CONNECTORS AND WIRING.