Something weird happened to mine long ago, and I've not investigated it....now that I have a bunch of free time for 5-6 weeks, I will probably delve into it. My symptoms are that one day I went to apply the parking brake (a year ago  ) and it kinda "bounced back" and the pedal is midway in the travel from up to down, and won't go up any higher, it feels springy....and when clicked down, 0 resistance on either wheel, but its pretty hard to get the pedal down....so I don't know what broke. I'll have to take it all apart and see I guess. It happened about 4-5 months and many many successful uses after I replaced the parking brake shoes.
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