I have a 1998 buick Lesabre and it has recently started making a squealing noise anytime I pull to the left. I am assuming it is my powersteering, but I can not find my powersteering levels!? I am trying to give the care to my parents, but I need to know what is causing this problem before they take it. The car only has 68000 miles on it and I take good care of it. Should I check my left brake pad also?