Anti roll bars are part of your vehicle's suspension system, and they help maintain stability in corners and sharp turns. Cars naturally tend to lean toward the outside in a corner and anti roll bars help compensate for this movement by balancing the movement in the car's suspension. They are usually installed on the vehicle's front and rear suspension systems. It's rare for an anti roll bar to break, but a more frequent problem is when the bushes become worn. This can sometimes be identified by sounds like squeaking or knocking when driving through corners. In that case the anti roll bar may need to be replaced.