Brake drum skimming

Depend on the amount of wear I guess, but in my opinion if the magnets are worn and need replacing, you should have the drums machined as well, however if you do not intend to replace the magnets at this stage then don't do the drums yet. I replaced all the magnets and had the drums machined on our BT last year. This is my opinion only, and I'm not a mechanic.

Regards,

Col and Diane.

Update. Both rear wheel drums were badly scored on the metal surface where the magnets contact. Front wheels fine. Took the rears to my mechanic for skimming. He found that both hubs were out of round, “left to right” as you look at the drum from the end of the van. Upon further investigation he found that the fault lay in the mating surface where the hub bolts onto the drum. The drums are two piece. Machined these two surfaces back to true. He believes the scoring occurred on every revolution, the magnet would make contact with its mating surface at the high point.

No, bearings were fine, worn a little but as expected. It was the drum surface where the brake magnet makes contact that was badly worn away.