04 sc V8 New member Dec 19, 2007 #2 you must be refering to the adjustible porportioning valve mounted on the rear frame rail that connects to the rear axle housing. It adjusts rear braking pressure depending on weight in the vehicle.
you must be refering to the adjustible porportioning valve mounted on the rear frame rail that connects to the rear axle housing. It adjusts rear braking pressure depending on weight in the vehicle.
