[2000-Denali]

I've got a 2000 Denali and I just recently had this problem come up.

It sounds like a squeling and grinding type noise when I'm driving now. At first it was just when going in reverse...so I had the back u-joints replaced and the serpentine belt as well.

But now its like all the time when I'm driving forward or reverse. I was told at les schwabb that I only have 30% life on my brakes.

Could it be that I just need new brakes? or just the pads and rotors? or wheel bearings?

I just dropped about 2k in repairs on this...any help would be great! Do you think that having the guys at les schwab drive it and take a look...do you think they will be able to pinpoint the problem??