I read an article on brake pad compounds a way back, and I think the 'red clay residue' is from the brass metal in the matrix.

Thats the thing I hate about the Metal Masters, the nasty brown crap on my rims. However, by all accounts it varies from person to person, some get a lot of dust, some not much, some brown, some black. I guess there is a lot of variation in the compound or something.

I'm planning on trying out the Green Stuff when I upgrade my brakes sometime over the next few months.


juan