he suspension system is designed to provide the best combination of ride quality,directional control, ease of handling, safety, stability, and service life.
The suspension system allows a vehicle's tire and wheels to move up and down overbumps and holes in the road. It makes the vehicle ride more smoothly over rough roads.The suspension system works in unison with the tires, unibody or frame, wheels，wheelbearing, brake system and steering system to provide a safe and comfortable means oftransportation.
A suspension system has several important functions：
．Supports the weight of the frame, body, engine, transmission，drive train, andpassengers
．Provides a smooth, comfortable ride by allowing the wheels and tires to move upand down with minimum movement of the vehicle body
．Allows rapid cornering without extreme body roll
．Keeps the tires in firm contact with the road, even after striking bumps or holes inthe road
．Prevents excessive body squat（body tilts down in rear) when accelerating orheavily loaded
．Prevents excessive body dive (body tilts down in front) when braking
．Allows the front wheels to turn from side to side for steering
．Works with the steering system to help keep the wheels in correct alignment
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