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Amazingly that's exactly what I did on the night before! I was getting worried about the brake lines with such low temperatures, so I bought a bottle of some brake spirit-based fluid. I put it into the air lines before going to bed and then again in the morning - right into the glad-hands. And still one wheel got frozen because I had applied the trailer brakes (this was THE last time!). It wasn't an internal problem (frozen moisture in the lines). It was external - one brake pad FROZE TO the surface of the drum and stayed put even with the brake released. Hammering at it was the only way. And you're right - applying trailer brakes in cold weather is just asking for trouble.Originally Posted by GMAN
If your trailer brakes freeze up you can take the glad hands loose and pour some alcohol in the lines. Start pumping your brakes and using anything that has air and it should free itself up within a short time.