I had new tires (Yoko) installed on my MPV back in May '07. Around July '07, I started noticing the vehicle pulling to the left. I took it back to the tire place and had the alignment checked and everything was within spec. One of the mechanics said it could be a check valve going bad in my power steering unit. He added some conditioner, which made no difference. I took it back a few months later for the rotation and had them check the alignment again - still well within alignment spec but still pulling to the left.
Is it common to have a bad power steering check valve, or did I get a set of expensive crappy tires (should have stuck with the Michelin)?
