This is the stop lamp switch for the air brake system on 2003-2009 GMC Topkick and Chevrolet Kodiak C7500 and C8500 trucks. This item mounts underneath the hood on the master cylinder. Replace your old, faulty, malfunctioning switch with this brand new factory original part from General Motors at a fraction of the dealer price.

New. Never Installed. OEM part. Bulk Overstock

GM Part # 15039102 (number on the item)

Item is number 9 in the GM diagram