On Monday, July 22, 2019 at 4:05:54 PM UTC-7, wrote:
Temporary (!) ways to disconnect the surge brake on my 1992 Cobra:

1. The aft end of the long brake rod under the trailer (just ahead of the axle) is threaded and attaches to the "splitter" plate that pulls the Bowden cables, one for each brake. IIRC, there's a nut and a lock nut: just remove these and pulling on the brake rod will have no effect on the brakes. Make sure the aft end of the brake rod can't fall down and drag if the emergency brake is actuated. If so, cable tie it to the bracket under the trailer.