Brake Pad Warning Light

For your information the warning light never came on and I changed by front disc brake pads any way because they looked thin. I just wanted to know when the warning light would come one since the pads removed were thin. I thought my question was legitimate and logical, to know when warning light would come. A very brief answer would have suffice, not a lecture where you did not have all the facts. It was rational question to see if this warning light even works as it is supposed to do.