LED's?

OK, well i replaced the origional flasher and that was half the problem, the other half of the problem is that two of the 1157 RED LEDS they sent me were defective. thats why i wasnt getting anything out of the rear tailights....like someone mentioned as could be the problem....they were right. im currious, what are the chances that i get not just one but TWO defective LEDS, same color, same 1157.:dontknow:

also, what does the brake light run off of? do they have a switch that runs on load just like the blinkers? will they cause problems like the blinker flasher did?

and finaly how about reverse lights? how do they work?