The brake warning light come on for 1 of two things.
1. You have the e brake engaged.
OR
2. The sensor has noticed a drop in pressure in the system.
If you braked and they didn't work correctly, you are definitely losing pressure somewhere, meaning you are loosing brake fluid.
I suggest checking to make sure there is enough fluid in the reservoir under the hood. If it is between the min and max lines and there is enough fluid, then I'm not sure. But if there ISN'T enough fluid i would say have someone watch the under side of your car while you pump the brake pedal to see if any fluid comes out.
If fluid comes out that means you got a leak obviously and have to fix it or get it fixed.
The brake light does NOT come on for brake pads, the brakes have a built in thing that screeches when you have low brake pads.
Hope this helps.
