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Croft Trailer has the factory copper washers in stock.Rebuilt the surge brake assembly on my 101A2. New master cylinder, new shock, new "bearings" (bushings). After all that, the hole to insert a pin to lock out the brake STILL didn't line up. I have no choice but to believe that some of these trailers never had the holes all line up so you could insert a pin all the way through. I had no choice but to drill it out.
Of couse the copper sealing washers on the bolt going into the master cylinder are leaking now, so I need to try and source replacements. Hopefully i can find something locally.
That assembly requires two different sizes.
They carry all the factory parts for that Hydro-Act surge brake assembly.
https://www.crofttrailer.com/1760-hydro-act-copper-washer-for-master-cylinder-1-2-id/
I had same issue.
Installed new factory copper washers and problem solved.