Chad, we appreciate your honesty and your business. First thing, we must be able to duplicate a problem before we can repair it. The last time you came in the brake warning light was not on. Therefore, diagnosis is impossible. We have the patience to wait for the light to be on when you bring the vehicle in, we request you excercise the same patience. A rear brake light bulb is in no way connected to your brake pads, rotors, calipers, master cylinder of fluid. Most likely it is a bulb, which we can check on your next guardian visit. The $90. spent was for the brake warning light on your dashboard, and not for the one in the back of the truck. Be advised there are three switches which will turn on the same warning light. We need to know (diagnose) which switch is causing the warning light. So we request your patience while this intermittent problem surfaces. You had stated the brakes felt great and we are of course complimented. We stand behind our work, and will stay with this, until the problem is resolved.