I suspect that would be a problem for the person that changes several brake linings per day over the course of a long period of years. For backyard mechanics like myself, I doubt that would be a major problem. I change my brakes outdoors so there is not the issue of airborne fibers circulating around an enclosed space.
I also suspect that this would only be a problem with drum brakes. The drum is enclosed so that a small amount of dust will remain in the drum. With disc brakes, the rotors and pads are open to the air so the dust from any brake lining material will be blown off the rotor every time the brakes are applied.
However, why doesn't this blogger (a word that really aggravates me, btw ) write about asbestos in clutch discs? Transmission specialists are also exposed to asbestos dust on old style clutches every time a clutch plate is changed on cars with manual transmissions. So why is that also not reported???
i change my own break disks. but it being a bike and not a car i wonder whose last longer? i change mine like ever 3 years. they stay great for agggeess....and are bike break pads the smae stuff as cars? im not sure...