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Re: front brake grabbing (locking)
I re-read your OP, if you've got new drums they *should* be nice and round, unless you've gotten them really hot and then kept holding the brake pedal (like you'd do driving in Dallas - going 75 one minute then braking hard and sitting still for 5 minutes)
If something is only touching at certain points as the drum rotates, then either the hub/drum is moving, or the drum isn't round.
Make sure the bearings are adjusted properly (just a *tiny* bit of slack), then if you have a dial indicator you can mount the drums facing outwards and check the inside surface for out-of-round.
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