The upper strut mount replaces the upper control arm and upper ball joint used on traditional steering and suspension systems as the upper connection to the vehicle body. Strut mounts are hard-working components, capable of supporting vehicle weight. Each assembly usually consists of a rubber core that dampens noise and vibrations, and a bearing that allows the front wheels and strut assembly to turn while supporting weight. Whenever a suspension component is not doing its job, the result can be a chain reaction that causes other parts in the suspension system to work harder and wear out faster. Whenever load-carrying bearings become worn, they can cause the steering to bind.
Heavier vehicles are especially prone to strut mount wear.
First, secure the hood in the open position and locate the strut mount assembly which is usually bolted to the fender. Next, bounce the vehicle and observe the mount. Listen for unusual noises and look for looseness. On some strut mount assemblies it is possible to feel vibration as the loose components move inside their housing. Remember to use caution whenever inspecting a vehicle and avoid placing fingers where clearances may change during motion.