Air Brake Abs Warning Light problems of the 2000 Chevrolet Suburban

Abs/brake light illuminates intermittently. Dealer says brake control module must be replaced at cost of $1100. This is a potential safety issue and should be covered by warranty in my opinion as the abs system is inoperable when the light is on. I almost wrecked driving in rain on June 7, 2004 when applying brakes and rear locked up - not realizing abs was not operable.