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Will try drilling a pinhole in the plug we put in the right side front air line to see if this works. We don't go fording with the truck so a pinhole should work OK.

Thanks, I thought that there had to be a good reason why the glad hand had a vent. Will try and vent the line and see how the lights act then.

Following truck again today on the road (loaded with 4,000 gallons of river water or 33,300#) and the brake lights still stay on for over a minute after the driver lets off. Air tanks are empty of water & MC not dragging. Have noticed on new tractor that right front glad hand cover has a vent...

The brake switch is on the air side of the system (stock), and we have not noticed any dragging of the shoes or heating of the drums from a sticky MC. Air tanks are drained every day, and water has not been a problem.

Which air vent? The master cylinder is vented through some sort of vent system (to the air cleaner I think). Is the air booster vented the same way? Brakes do not hang up or drag at all. There was a post about the glad hands needing venting or else something happens. This is why I noted...

My son noticed that the brake lights on the water truck seem to stay on for an extended period after the pedal is released. I confirmed this in the yard with a mirror on the step ladder, and removed the breather on the top of the switch and added a shot of air tool oil to the switch. Also...