WHILE DRIVING AT HIGHWAY SPEED ON A TWO LANE ROAD AT NIGHT, APPLIED BRAKES TO AVOID ANIMAL IN ROAD. CONDITIONS WERE CLEAR AND ROAD WAS DRY. THERE WAS PLENTY OF TIME TO SLOW TO AVOID ANIMAL SO THIS WAS NOT A PANIC STOP. UPON APPLICATION OF BRAKES, HEADLIGHTS WENT OUT. DASH LIGHTS STAYED ON MAKING IT IMPOSSIBLE TO SEE OUT OF THE VEHICLE. APPLIED BRAKES WITH MORE URGENCY AND ALL FOUR WHEELS LOCKED. VEHICLE SKIDDED STRAIGHT UNTIL THE RIGHT TIRES MADE CONTACT WITH THE RIGHT SHOULDER. THE CAR THEN SPUN COUNTER CLOCKWISE BACK ONTO THE ROADWAY, ACROSS BOTH LANES, AND CAME TO REST ON THE SHOULDER OF THE ONCOMING LANE (APPROXIMATELY ONE AND ONE-HALF REVOLUTIONS). SKID MARKS ON HIGHWAY CONFIRMED THE WHEEL LOCK AND THE SPIN. CAR WAS SHUT OFF AND RE-STARTED AND ALL SYSTEMS WORKED FINE. UNABLE TO DUPLICATE THE PROBLEM.