Answer:Failure of the shock absorber will increase the braking distance
I will not explain the working principle of the shock absorber in detail here. To put it briefly, it is to convert the elastic potential energy of the automobile spring vibration into heat energy, so as to achieve the purpose of attenuating the frequency and amplitude of the spring vibration. From this principle, we can also draw a judgment method for judging whether the shock absorber is invalid: that is, after the vehicle has been running for a period of time, touch the barrel of the shock absorber by hand, and if there is heat, the shock absorber It has not completely failed. On the contrary, it means that the shock absorber has failed and needs to be replaced in time.
With the above foreshadowing, let’s analyze together why the failure of the shock absorber will cause the braking distance to become longer.
We know that when braking, the friction between the tire and the ground is used to slow down or stop the car. If the shock absorber fails, the vibration frequency and amplitude of the car spring will increase, resulting in a reduction in the effective contact area between the tire and the ground. The tire grip is reduced, and the failure of the shock absorber will cause the center of gravity of the car to move forward seriously when braking. Because there is no support of the damping force of the shock absorber, the front wheel damping system is soft, so it will cause the center of gravity to move forward. Due to the failure of the shock absorber of the front wheel, the compression force of the spring will be very large. The greater the compression force, the greater the rebound force, which will cause the vibration frequency and amplitude of the spring to further increase. The effective contact area is smaller and the tire grip is worse. In addition, the forward movement of the center of gravity will also cause the rear of the car to tilt, resulting in a reduction in the contact area between the rear tires and the ground, and a reduced grip. The superimposition of the front and rear tires will eventually cause the braking distance to be extended.
How to judge whether the shock absorber has failed (without oil leakage)
1. Press the car body to the lowest point with your hand, and then quickly let go. If the car body jumps up and down more than 2 times with a large amplitude, it means that the shock absorber may fail and further analysis is required
2. Remove the shock absorber and check whether the damping force of the shock absorber is normal: hold both ends of the shock absorber with your hand to pull the shock absorber several times, and keep the shock absorber in the installed state during this process In the same posture, if the shock absorber has a stable damping force, it means that the shock absorber is good and has not failed; if the damping force of the shock absorber is unstable or there is obviously no resistance, it can be judged as a failure
3. When the car stops after driving on a bad road for a certain distance (generally more than 10Km is appropriate), touch the outer surface of the shock absorber oil tank with your hands. If the temperature of the shock absorber oil tank is not higher than the neighboring oil tank, it will not generate heat. Parts (such as springs) indicate that the shock absorber has failed. If the cylinder temperature of the left and right shock absorbers is high and the other is low, and the temperature difference between the left and right shock absorber cylinders is relatively large, it indicates that the performance of the low-temperature shock absorber has degraded or the shock absorber has failed.
If the shock absorber has leaked oil, you need to look at the specific severity of the oil leak. If the oil has spread all over the barrel, it is recommended to replace the shock absorber with a new one as soon as possible. If there is only a slight oil leak or the leaking area is not wet In the case of this, please consult a professional repair shop master.
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