You 'boiled' it off. I just replaced front and rear pads so I would pass state inspection next month, and be safe to make 2 upcoming out of state trips. I had a friend do it, who owns his own bike shop. He also changed my clutch and brake fluid, makes sure all is working as it should, and charged me $100 for his labors and fluids. I bought the OEM pads. Your calipers probably seized. Bet they will need re-built.