I’ve very rarely used cheap isopropyl alcohol (rubbing alcohol) to free up the ice inside one of the air lines. Rubbing alcohol, post-pandemic, must be way cheaper than the stuff sold for the same purpose. I’ve been told to not use more than 1 cap-full of alcohol, MORE IS NOT BETTER.as It dries out any rubber or felt seals. If a little bit of it doesn’t solve your problem in seconds, more will not fix your problem.
When I used it, I set both brake valves in the truck. Disconnected 1 glad-hand at a time, and poured a cap-full of alcohol into each glad-hand and then reconnected both to the trailer and pushed in my brake valves. About a second later I heard a ker-chunk and my brakes were working.
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