Coil Springs together with shock absorbers make up the vehicles suspension system which keeps the tyres in contact with the road. Coil springs are the metal coils, and support the vehicles weight and absorb the impact of the road condition. The way coil spring is built allows it to ensure the smoothest ride even on good roads. On most front-wheel-drive cars, coil springs are assembled to the strut, coiling around it. Heavier-duty vehicles place coils between the chassis and the frame and feature shocks as a separate suspension component. Another popular item on the suspension market is coil-over shocks. Like a strut, the coil wraps around the shock absorbers, but it does not generally bolt to the steering knuckle like a strut does. You must replace shocks and struts more often than coil springs, but inspect the springs when you replace any suspension components.
Coil springs can and will become compromised after time. However, depending on their application to the vehicle, many coil springs can last the lifetime of the vehicle. While coil springs support the weight of the vehicle, it’s the shocks absorbers or struts’ job to prevent the bouncing.
Coil springs are much more durable than shocks and struts, and many times replacing the shocks or struts will return the vehicle back to its original level of performance. However, weak shocks and struts will take their toll on coil springs if left ignored for a long period of time. As the coils weaken, you will notice clunking or bottoming-out sounds, because the coils are not able to provide stability to the weight of the vehicle. In addition, weakened coils will damage shocks and struts, because their rebound distance will be much farther than the components were intended to perform. Weak coils will compromise the ride height of the vehicle, and this symptom will affect the vehicle’s alignment. Measuring the ride height of the vehicle and comparing that with the specifications will help you determine whether the coils are working in conjunction with the shocks and struts.
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