Fred, that's a really good point; that could definitely be a safety issue if there is a big difference with the low-dust pads.
I know from my younger days that old Chevys certainly wouldn't stop well with a dead engine.

I started this debate, so I might try to do a test with Old Pearl, and see if she'll stop with no brake boost - if I can find a really big deserted place.
(inquiring minds want to know!).

DG