dennisbroad@shaw.ca

Erwin, I have a 95 Dynasty with exactly the same problem. I to have gone through the air system and come up with the following conclusion. The spring brake relay valve ( the one on the left in your picture) is fed blended air from both the front and rear air tanks. This is to prevent the spring brake from applying if one tank was to loose air pressure. There is a shuttle valve in the sp br relay that achieves this purpose. If you drain the air system, remove the front and rear brake lines from the sp br valve and cap them. Build up air and drain either front or rear tank and see if the other tank holds. These shuttle valves can gum up and stick. The valve on the right in your picture is the inversion valve (spring brake modulator valve). I have the air system schematics for the 96 Dynasty on my other computer that I could send you if required. Dennis

Hop, I have wiring diagrams for my 95 Dynasty. Do you still need the diagram for the rear run bay? I could scan it and email if you want it. Dennis