Traveling west on I-70 at the Eagle Colorado exit the brakes failed as we pulled off the highway the brakes failed. Went up the ramp at 50-60 MPH. Missed the cars waiting to enter the round-a-bout and went over a decorative divider about 3 feet high. Went in the air and was then traveling on the wrong side of street. Saw a fireplug and hit it at 20-30 MPH and that stopped us. No airbags deployed at either hit. Four in the car and no serious medical issues, just soreness. Had police and fire test the brakes to show they didn't work. Obviously the air bags Hadn't deployed. Filed police report with Eagle City, 2021-000417 and AIG insurance report 80255229. Car was declared totaled.