@@alexharalambie1377 Chains are on the rear wheels, I also put on the front after this video. I am in a low gear, if you watch the tires they are still rotating slowly, the tractor suddenly lost all 4 and that's when I hit the brakes. You should watch the video when the same happens with 8 wheels on the Valmet, that was even more exciting, with hydrostatic drive and automatic 'work brakes' :)