I have a 2013 Mazda 3 with 85,000 miles. Recently, my car has been idling rough - but only when I depress the brake pedal. As soon as I take my foot off the brake, it idles just fine. And If I pull up the parking brake, the car starts idling normally. The brakes have about 15,000 miles on them. They stop the car just fine and they aren’t making any noise. Any thoughts on what might be wrong?