My wife says her Suburban has suddenly become VERY hard to steer. She claims it went out right in front of our house and she had a heckuva time getting in the driveway. She said it was hard to stop too. I jumped in and tried it and sure enough I put it in reverse and felt NO power steering assist whatsoever and going ever so slow, had a hard time stopping. The Sub has 99,640. Checked the PS reservoir and it's full. There are no puddles of anything anywhere. Any help will be greatly appreciated.