DRIVING IN SNOWY CONDITIONS; BRAKES FAILED TWICE WHEN I APPLIED LIGHT PRESSURE. FIRST TIME, THE BRAKES SHUDDERED, BUT THE CAR FINALLY STOPPED AFTER I APPLIED HARD PRESSURE; THE SECOND TIME IT HAPPENED, THE BRAKES SHUDDERED, AND NOTHING HAPPENED WHEN I FIRST APPLIED HARDER PRESSURE. EVENTUALLY THE CAR SKIDDED, BUT IT WAS TOO LATE. *TR