So with the lamb vac motors, my experience has been that they are more difficult to change the brushes than to say like the older GS vac motors that
kleen-rite used to sell, the GS vac motors were easy to change but they wore out allot quicker than the lamb motors, in fact I think the lamb motor brushes for some reason last 2 or 3 times longer than the old GS motors, that is why I say to let them go until they stop working then replace them, I think for a newbie they may find it way more difficult to change the brushes until you get some experience.