Search results

I have had a bad anti compounding valve affect brake operation but only treadle function appeared to be affected. Somehow air is inadvertently being fed into the spring brake release circuit for towing. Maybe there is a way to temp disconnect this air circuit.

Maybe you only have service brakes then. Take a few pics of the rear brake chambers and pads and post them.

Air should release from the blue gladhand when you let off the brakes. Not much. A quick puff. If air cannot escape then you could have an issue where your brakes won't release. Maybe something is disconnected leading to that gladhand. First place I would look is under the front bumper at that...

If you take the front gladhand covers off does any air continuously leak from either? What about when brakes are applied? I would believe unicorns replaced your speedometer long before I believe your truck only has 60 miles in 20 years.

If the brakes work with the treadle (foot pedal) and the spring brakes fully engage when all the air is drained out, then somehow you have air feeding back into the spring brake release system. Or air lines are switched somewhere. Did you replace the check valve behind the front grill?

Ok unblock the front gladhands and you will have parking brakes. It's a dangerous situation you have unintentionally created. The air leak on the front emergency side is usually caused by the check valve behind the bumper.

The pads look like they are against the hub in the pic

You cannot block off either front gladhand. You must fix the cause of the air leak there. By blocking off the front red gladhand you are inadvertently feeding air into a towing release circuit for your spring brakes.

Looks correct to me. Truck is held by spring brakes. When you put the dash valve in park does the truck roll? But you can still step on the brake pedal and stop? Do you have an air leak at your front red gladhand and you blocked it off so you can build air?