How old is the car ? things like that really helps
Here is ozzy land brakes not allowed to sold with that last brake pad sold was in 1979..
If you wash it down with water wear a mask and gloves remember to wash you’re brake system first.
then take them off with safe gear on.
Put new pads with anti asbestos on then next change you know its safe to change ..
Remember i just given a vice not telling you how.. i will let others inform you as well