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bobble
Howard
It means it’s a lo-tech motor that has consumable contact points between the rotor and power connectors. Over time / use they wear out.
https://cordlessdrillzone.com/drill-wars/brushless-vs-brushed-motor/
You’d be doing well out of it if you actually wore the brushes out though. That’s a lot of drilling.
It will chisel those bricks out fine I reckon.