My dad owns a Buick Lucerne a few years old. (It's a 2010 with 45k miles) Visited him last fall and noticed it was pulling hard to the right. So hard that if you weren't paying close attention, you'd be on the shoulder quickly. He has dementia and is not up to maintaining it so I took it to an alignment shop. I picked it up right before I flew out and the shop told me it was on spec with alignment but weren't confident they had solved the problem. Visited him again last week and it's till pulling just as hard to the right. Left it in the hands of my BIL to solve but he's not mechanically inclined and I suspect there must be something funky going on. He had new brakes and rotors installed and problem still exists so I doubt it's a sticking caliper. Post on a couple of Buick forums lead me to believe the problem is not uncommon. Anybody have any suggestions as to what the problem might be? I told my BIL to swap the front wheels to see if it makes a difference.

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1977 300d 70k--sold 08
1985 300TD 185k+
1984 307d 126k--sold 8/03
1985 409d 65k--sold 06
1984 300SD 315k--daughter's car
1979 300SD 122k--sold 2/11
1999 Fuso FG Expedition Camper
1993 GMC Sierra 6.5 TD 4x4
1982 Bluebird Wanderlodge CAT 3208--Sold 2/13