April 8, 2013I looked at a 98 ext cab 3/4 ton the other day and it has a box mounted under the steering wheel with a light on it, the light changes color when you`re on the brakes. Dad thinks it may be some kind of brake booster for pulling trailers. Any ideas?
Forums : Silverado (c/k) (1988 - 1998) : what is this box (494 Views)
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