Not a duplicate of this one I think, circumstances are different.
My bike has rim brakes. The last two day I have cycled on snowy ground, and at the end of the rides the brake pads where covered in dirty snow.
Now I have noticed that when I use the rear brakes, I immediately smell a peculiar odor, even with light braking like the last 10 meters before a traffic light. The closest odor I can relate to it is the one of a used rifle shell few days after it was shot.
Is this normal?