When you put your foot on the brake pedal, there should be some tension. Of course, pressing down on the pedal comes with the expectation that the vehicle comes to a smooth stop. If these two things don't occur, there might be a problem. Other indicators may suggest somethings wrong with the brake pedal and related parts.
Brake pedals should not vibrate, either. Vibrations represent a warning sign something might be seriously wrong. Also, depressing the brake pedal should not lead to any noises. Noises may suggest the brake pads or other parts are wearing out.
