Just replaced the A-60 coupling inner assembly where I found the back-up solenoid broke off the master cylinder (could have replaced the master cylinder only but much rust). When I went to bleed the brakes (was successful hooking up my pressure bleeder) I found the brake linings missing mostly missing and disc rusted (normal) I belt sanded the disks but would like to avoid the need in the future. BTW, Kia Sophia brake pads do not fit
Bought new caliper pins, greased them well and re-assembled.Another reason I want to avoid rusty brakes - found chunks of rubber missing the entire circumference of the right wheel - looks like the brakes kind of seized up while moving.This is the best reason I have found NOT to install brakes on both axles.
Also found the steel trailer tongue kind of rusting on the inside (about half gone) - guess I will be ordering a new steel tube and have the ladder welded on. I will coat this inside and out in POR-15 or Chassis Saver paint. Temped to also fill the inside with expanding foam (with a PVC tube for brake line and wiring) to keep salt water out altogether.