[Big Block Bill]

GM came out with a bulletin back in 1999: #99-05-24-001A that has you install a Brake Combination Valve off of a 1/2 ton part # (92-94) 15650150 or part # (95 & newer) 12548265. We had great success with this on any GM 2500 Pickup, Van, or Suburban with a GVW 8600 lbs. & over. The rear brake shoes have to be replaced and both drums machined or replaced at the same time due to glazed linings or the repair will not work any better than the old Brake Combination Valve.

Bill