Noisy generator

[Certimafied]

Hello out there in model a land! I’m slowly waking up my 28 fordor and have found my generator brushes make noise when the generator is spinning. The armature and brushes look good no corrosion.
Anybody ever run into this? I think I’ll try changing them I just have never had such noisy brushes In a generator Before, and I have revived some rusty heaps from their decades long slumber.