Untuk mempercepat pelembutan getaran bingkai dan badan dan meningkatkan keselesaan perjalanan (keselesaan) kereta,penyerap kejutandipasang di sistem penggantungan kebanyakan kereta.
Sistem penyerapan kejutan sebuah kereta terdiri daripada spring dan apenyerap kejutan. The penyerap kejutan is not used to support the weight of the car body, but to suppress the shock when the spring rebounds after absorbing the shock and absorb the energy of the road impact. The spring plays the role of alleviating the impact, changing the "high energy one impact" into "small energy multiple impact", and the penyerap kejutan gradually reduces the "small energy multiple impact". If you have driven a car with a broken penyerap kejutan, you can experience the bouncing of the aftermath of the car going through every pothole and ups and downs, and the penyerap kejutan is used to suppress this kind of bounce. Without a penyerap kejutan, the rebound of the spring cannot be controlled. When the car encounters a rugged road, it will have a serious bounce. When cornering, the tire's grip and tracking will be lost due to the vibration of the spring.