I bought a 2nd hand set of calipers/disks/pads off ebay but the disks were warped, the garage I used sent them to a local guy to have them machined, but they still vibrated badly under braking. I replaced them with a set of genuine Ford disks and after a period of time they also warped. So I then decided to replace disks and pads with brand new i went for these discs (grooved only) https://www.mtecbrakes.com/mtec1386.html with mintex m1144 pads fitted in Dec/Jan by Feb the disks had warped again. Starting to get a bit fed up with the whole situation in honesty. I spoke with the garage and he said that he has never had much luck with getting disks machined. I can't understand why though, to my mind if a disk is machined flat then it should be no different than fitting a brand new disk. I am not keen on spending £100 on yet another set of disks if there is anywhere that can machine the ones I have and get them to not vibrate under braking. thoughts ?