Water inside axles - normal?

[MHay]

2017 Jayco Jayflight with Lippert 4400 axles. I’ve been getting a trailer wiring fault message from my truck which is related to the brakes (the brakes are now only intermittently working). I’m trying to trace the issue and I noticed that as I pulled on the brake wires that cross inside the axles they were wet and a bit muddy. I had recently driven in heavy rain, but I was surprised that so much water would be inside the axles. Is this normal or should I be concerned? I’m contemplating drilling a small weep hole under the axles for the water to drain out but not sure if that’s advisable.

[MHay]

The wires are insulated and the insulation is molded together within the axles. Once they exit the axles they’re separated and connect to the respective ground and power wires/magnets.

I’ll have to look again, but I don’t recall seeing any factory drain holes.

[enblethen]

Are the brake wires individual wires or are they a two conductor jacketed cable?
If individual, you should replace with the two conductor brake cable.
Single conductor wires could have small nicks which would allow moisture to enter and effect quality of braking power.
I would not drill holes in tubular axles. However look at each end for factory drain holes. Make sure, if equipped they are open and clear of debris.