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2016/8/30      view:




Why do I need to replace worn shocks or struts?


In a nutshell: To keep the vehicle’s stability within its designed capability. Stability means keeping the body as level as possible during bumps, turns, stops and turns: And, at the same time, keeping the tires on the pavement as much as possible during all driving conditions. The shock’s main job is to resist body & tire movement, but as shocks wear the vehicle becomes unstable; the steering feels less responsive, the body leans more and the tires grip less. Stopping ability can be reduced as much as 23% and the driver needs more skill to keep the vehicle on the intended path and from losing control on curves. 


Shocks cycle about 1500 times per mile driven. After 50,000 miles, that’s 75 million cycles. Because shocks use metal discs that flex with each movement, they become fatigued over time which causes the reduced performance, which is why replacement shocks and struts are suggested after 50,000 miles/80,000 kilometers.



 Q: When do the car makers recommend to change the shock absorber?

There are four main reasons that determine when to replace them:

1) To upgrade performance;
2) to restore the vehicle’s designed performance (usually after 50,000 miles);
3) when the vehicle has excessive ride control conditions (i.e. nose dive, body roll, etc.); 
4) when the vehicle has a failed unit (i.e. dripping hydraulic fluid, tire cupping, excessive bounce, etc.).



 Q: What is the troubles if driver didn't replace the defective shock absorbers?
 A: A “completely failed” unit may:

1) Leak hydraulic fluid.
2) Cause uneven or cupped tire wear.
3) Create unsafe driving conditions.
4) Make knocking noises or rattles.
5) Create vehicle swaying and require constant steering corrections.



 Q: Is it OK to change the only one shock absorber?
 A: We recommend to set the pair of shock absorbers because when oil leakage occurs in one side, the other is near to the same situation.



 Q: When we change the shock absorber, should we change a spring too?
 A: If the spring is worn out or its shape is changed, you should replace them in the same time.



 Q: What is the difference between Gas type and Oil type?
 A: Oil type: Oil + Air : Normal performance

Gas type: Oil + Gas : Better performance 
Gas type contains the nitrogen gas.



 Q: Which do makers recommend, Gas type or Oil type?
 A: They recommend the Gas type when you drive on the bad road because of their good performance. An Oil type can work enough on the paved road, but a road condition changes and it has the limit of its ability, so they recommend the Gas type.



 Q: Why do we feel comfortable in driving even if shock absorbers aren't gas type?

Gas type : It's better than Oil type. You can feel good even if you drive in bad roads. 
Non Gas type (Oil type) : You can feel good when you drive well in paved roads.



 Q: What is the minimum degrees the shock absorber can bear?
 A: As for absorber oil working temperature, when the shock absorbers are operated in -40 degrees, the movement is not smooth because the inner oil is sticky very much. However after you start driving, the oil temperature is getting high and getting usual, so you should drive slowly 300 meters to 500 meters at first.



 Q: What is the caution of installing a shock absorber?
 A: Followings are the main cautions.

1.Do not hurt a rod.
2.Tighten bolts and nuts properly.



 Q: Is there any problem to stock the shocks to lie down?
 A: No problem, but it is better to stroke 4-5 times before replace new shock so that air and oil will become familiar.



 Q: What is cavitation?
 A: Cavitation means the phenomenon that bubbles appear and disappear in the oil during working the shock absorber. Cavitation makes the performance low, but gas type holds it.