YES THOSE TWO BRACKETS ARE WHAT HOLD THE CALIPERS, ALL JUNK, GET A CALIPER FOR DIRT CHEAP OFF ONE OF THOSE POCKET RROCKET BIKES, PERFERBALLY THE REAR CALIPER, THERE DIRT CHEAP ON EBAY, UNDER USED ASIAN BIKE PARTS. I BELIEVE THERE IS A SECTION DEDICATED TO BRAKES, I BOUGHT ONE REALLY TRICK...