770 I purchased at auction 2 years ago, no brakes, power shift works, pto works, power steering works, I changed hyd fluid after I bought it, put in Hy-Tran Ultra, purchase a couple relief valves for the filters from salvage yard, those were missing, would explain the new hydraulic pump that was installed before the farm sale. I leave tractor at my brothers place, he farms a little more ground than I do, have a 15 year old nephew operates it once in a while, only answer I get when I ask about the brakes, "They stopped working" I baled hay for a couple hours yesterday, New Holland 273 with thrower, 90 plus degrees out, noticed smoke coming from under the platform, like hot oil, I used this tractor summer of 2015, did not have smoke issue. Ideas where to start looking?