Bendix brake valve question

[PuroCumminsPower]

(08-29-2016 )Mr Hagg Wrote:  THE QR1 Valve is bad. It is located under fifth wheel. When you release your brakes there is a quick release valve in the rear that trips the air and not letting it come back to the front. You should have one that has 4 lines to it.

Here is valve directly under fifth wheel.