Vibration and humming caused by pressure on the brake

Friends, especially at high speeds, the brakes were not felt very much when the brakes were pressed, but a serious tremor and humming occurred in the vehicle's chassis. It goes the same way when I try to waste my Trial to eliminate possible engine or transmission problems. In this complaint, the transactions made in the service went to the rear drums lathe. The front discs have been turned. It worked, however, 10-15% of the first tremor I feel is still ongoing. Apart from these, what to do and what to look for

You need to change the discs, the disc turning cycle is now closed, no matter what the part is done, the turning process will never give a hundred percent healthy results. are made, but the disks are not so costly parts, so change is the healthiest and the root solution of the problem.

the lathe is not very expensive, my teacher changes it in my opinion, it is not too expensive, the rupture rises when it is heated from thinning on the lathe.