Not Ranked
I wouldn't go changing calipers until you actually know what is happening - if it really is weight distribution causing it (or a crimp in a brake line possibly) then new calipers won't solve things, just annoy you since you will have spent money and not resolved it.
pressure in the line would creep past the crimp, but not under the initial lock-up, then you've got the locked wheel already locked, so keeping it locked takes less pressure (the tyre has less friction once it's sliding).
Treeve
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