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If it's pad knockback, something would have to happen to knock the pads back.
I'm thinking out loud but could there be a test to see if the pedal holds once you've pumped it up, and removing the possibilty of pad knockback at the same time? I guess the simplest would be to pump it up at a full stop, then keep hitting pedal at various longer intervals to see if it sinks. In other words take pad knockback -- and only pad knockback -- out of the equation.
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