15-20 minutes ago, I share the problem that I lived, I got out of the car to shop, I had to get on a ramp road, the brake swelled when I stopped on the ramp and I could not intervene, the car started to run back, the gear is in the 1st gear. I got off using the brake, waited for a while and started again, I was not far from the house (about 300 meters), I came back, I went back and forth, I tried to brake a little back and forth, but I was swollen when idle, it hurts when I put it in gear, then I saw that the temperature got too high, I stopped, I stopped the engine while looking at the engine, I saw it in places where I parked in front of the house. I would not have paid attention to the heap residue, and it was where I parked the maneuver I was wondering if the brake fluid is missing or is there air?