Quote:
Originally Posted by Brian Carlton
While worn suspension components can possibly cause a shimmy on braking, it would be more likely to observe such a shimmy at higher speeds when not braking. The act of braking loads the components on the front end and prevents oscillation in most cases. However, when the disc is loaded, it will immediately display a vibration at most speeds above 40 mph if it's got any runout in it's faces.
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Check the bushings I showed in this picture. I had both these bearing ware out on me and when they are warn they will feel solid while driving, but when you step on the breaks if puts force directly on that rod. and if the bushings on ether end are warn out the whole assembly will vibrate.