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Q: brake lite on 1991 Chevrolet G Series Van (G20)

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
When I backed out of my drive way this morning my brake lite came on. What is the most common reason? Dealer just checked my brakes for wear and said front brakes pads were 70% worn and the back shoes were 65% worn. Brake fluid is full.
(1) Answer
Air in the lines, bad master cylinder, bad wheel cylinder, bad brake line, etc. Dangerous situation, have vehicle towed to a shop for diagnosis and repair.