I was wondering exactly what is the purpose for torsion bars, and how do you know when they are wearing out?

They support the weight of the vehicle, and they're worn out when the front won't stay at the proper height.


http://auto.howstuffworks.com/car-suspension3.htm
http://www.answers.com/topic/torsion-spring
http://www.4wheeloffroad.com/techarticles/131_0306_TORS
http://www.toyotaoffroad.com/Articles/Information/torsion_bars.htm