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Remove the gladhand covers. Make sure no insects made nests in the holes.

You can charge your air system thru the front red gland hand but you will release your spring brakes at the same time to the truck has to be chocked. You can remove one of the drain valves on an air tank and screw in an air fitting and fill it that way also.

Maybe something else wrong and you burst a valve diaphragm in one or more of your new valves.

They are in the top section of the main forum page.

I see your above post where you say you replaced them. There are a lot of valves on the truck. For this issue I would follow the tm troubleshooting flow charts and see where it takes you. Important that no gladhands are blocked off. Will cause all kinds of issues. Could be a treadle valve issue...

I would start with the 3 valves under the drivers side by the steering box. If more than one is bad you can get all kinds of symptoms. Don't plug vents. It never works out well.

The front gladhands are for towing only not supply like on the M939 trucks. If you look on the cover it has a vent on each same as axle vents. If the vents are clogged or if some bug nests in there and it cant breathe, this can cause the brakes to not release. Behind the front grill is a small...