Guys

I had me discs and pads changed in the summer by ford under warranty cause they were warped after 20K Miles ?????
Just a few weeks ago they have started squeaking and doin my head in my friend has had them off last weekend and sanded down a bit for me they didnt squeak for a couple of days and now started squeaking again, he said we are best to change the pads ive been looking at the green stuff pads hoping these will make a difference do you think they will and does anybody know if they are decent pads. Just dont want to waste money if they are gonna start squeaking again.