Check out this article from InternetAutoGuide.com to find out why the alignment on a car can go wrong, and what to do when it does: bit.ly/UrrHBs
"Taking Sides
Tire separation can make a car steer itself, and this condition often escapes notice. The separation occurs between the tire belts, and sometimes no obvious defect is visible. You can check for this by switching the front tires and going for a test drive. Replace the tire if the pulling sensation changes sides with the tire. Do not continue to use a separated tire anywhere on the car, as its structural integrity has been compromised.
Braking Bad
A brake that fails to release completely can cause a car to pull to the side that has the excessive drag. The brake caliper piston can fail to retract completely if the piston or bore are corroded. The rubber brake hose that serves the right front wheel may suffer from internal decomposition. Loose rubber inside the hose can act like a check-valve, holding hydraulic pressure on the caliper piston after the brake pedal has been released. Experienced mechanics will often spin a car's wheels by hand, to verify proper, and similar, function.
Continental Drift
Most paved public roads are higher in the center, to aid drainage. This crowning may be more exaggerated in areas prone to routine road flooding. Whether you drive a Lincoln or a Lotus, road crown may cause your car to drift toward the right. Special alignment adjustments may be prescribed by the manufacturer to ease your car's tendency to drift away from the road crown. You might ask if some degree of "road crown compensation" can be added into your alignment adjustments if extensive travel on such roads is anticipated."
Courtesy of Internetautoguide.com
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