Stabiliser bar

2.5.4. Stabiliser bar

An anti-roll bar / anti-sway bar / sway bar / stabilizer bar is a part of many automobile suspensions, that are fitted on the front axles to reduce the amount of body roll, when the vehicle is cornered.

Stabilizers bar acts as torsion bars and twist, restricting the excessive body roll of a vehicle during fast cornering or over road irregularities. It connects opposite (left/right) wheels together through short lever arms linked by a torsion spring.

It is used along with shock absorbers or struts to give a moving automobile additional stability. That is also called as stabiliser bar. It is a metal rod that spans the entire axle and effectively joins each side of the suspension together.

Fig: Stabiliser bar with Torsion rod

Fig: Stabiliser bar 

When the suspension at one wheel moves up and down, the anti-sway bar transfers movement to the other wheel. This creates a more level ride and reduces vehicle sway.

In particular, it combats the roll of a car on its suspension as it corners. For this reason, almost all cars today are fitted with anti-sway bars as standard equipment, although if they're not, kits make it easy to install the bars at any time.