The Front suspension Lower left Aluminum Steering arm control arm with ball joint 31126777729 31124081431 fix for 7 SERIES F01 F02 F03 F04 5 SERIS F07 GT XDriver

Modern suspensions use a shock strut system and upper control arm. By placing an arm at the bottom of the strut to control forward and backward movement, the strut can work from the top of the suspension without assistance to control the movement of the wheels. In early designs, both the top and bottom control arms used springs sandwiched between them. This type of suspension greatly limits the amount of wheel travel of the suspension. This results in a rougher ride. Since the suspension is forced to lean against a rigid collision block instead of smoothly passing through bumps, the suspension is placed on the subframe instead of requiring the entire frame to enhance Safety crash panels are installed in the vehicle chassis. These panels absorb energy in the event of a collision and dissipate energy throughout the chassis and away from the passenger compartment. By using the control arm suspension, these crush panels can be used. Many control components are made of cast or machined alloys. The lightweight material of the suspension components reduces the unsprung weight of the suspension, thereby reducing the impact caused by bumps and rough roads. The advanced technology of shock absorber design shows that reducing the weight of suspension components (such as the control arm) has a great impact on the quality of the suspension. By using the control arm technology, leveraging the arm, lighter and softer springs can also be used.

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