Santa Fe (CM - 2007-12) :: Squeaking On Passenger Side - Brake Pads?

My son was hearing a bit of a squeaking on the passenger side. So I decided after some time to pull the front wheel. (most important brake). Well the pad wasn't moving on the outer guides (serviced it as required and lubed to get it moving). But the lower guide pin wouldn't move in/out. Needed to drift it out and it was very well rusted end to end. I put new pads on early as year I am sure and all was fine. I cleaned the pin on my wire wheel grinder. That lower pin had a collar near then end. Turns out its rubber, I thought it was a metal spring collar. Oh well the wire wheel did a number on it. I don't know the significant of that piece nor whether the pin is in the right place since the top one is different. I do these one at a time so its almost impossible I swapped them in the number of times they've been out.

I never seen so much tightening on any vehicle of pads and pins rusting in as on this vehicle. One has to wonder why. My vehicle also seems to have or what sound like a gear slap upon engaging in reverse or forward from front and back which is most notable after sitting and first engaged. Not every time but this is built in 2007 and there is a TSB for some washers. Hyundai Canada does NOT use the same TSB number they have their own. I talked to a dealer about it but he never indicated it would be the cause only its a different number. I am not impressed in this AWD drive power train. It needs a lot of TLC and the slap I hear is typically due to power train engagement play/slack being excessive most likely due to wear somewhere.. Even my rear sound off not a howl but noisy running which doesn't change with road surfaces so its not the tires. Maybe the AWD bearing or unit going. No of this should even remotely close to needed anything for at least another 100-150k at least.