Wizard of Woodstock wrote:
On Sun, 21 Jun 2009 20:15:06 -0700 (PDT), Tim
wrote:

that looks like a serious dose of the clap, you got there Tom. Too
much exposure to salt in a tight spot.

Don't think so - if that were the case, the entire system would be
compromised like this and it's pretty clean up the tube to the brake
actuator - just a dirt.

What I think happened is that the solenoid let go - that's basically
brake fluid corrosion. This has been leaking for sometime - that's
what I'm thinking. I have had to add brake fluid over the years, but
it's a pretty open system so evaporation I figured - apparently not.

No indication it was leaking either until it let go.

On my trailer (23' Marquis) it's all exposed and so it has less means
of build up.

The pic of the brake line looks evil too. and it might be a lot of fun
trying to bleed the brakes with them baptized in brine as well.

I've seen that on an old Escort I had that had a brake line release.
Corrosive stuff brake fluid.

Unless I'm dreaming, I seem to remember reading about a non hygroscopic
synthetic brake fluid. You might consider using it after you replace all
of your brake lines and rebuild, if possible, the calipers and master
cylinder. The solenoid appears to have a steel cover. Can you find one
that doesn't have a ferrous metal cover?
Champions Trailer Parts and Dexter Axle are two good sources of
information on trailers. They both have web sites.