Bad vibration issue needs second look

Published 12:00 am Sunday, October 26, 2014

Q: Hello, I wanted to know what could be causing this vibration I feel when I’m driving. When I’m driving on the highway at 60 mph or faster, my wheel is very shaky. When I come down a ramp or decelerate when coming to a stopping point, it is really bad. The wheel is shaky and the driver’s side tires feel very loose. You can hear and feel it.

I have taken it to my local dealer, and they have checked everything on my suspension and said everything is tight as it can be on that end. My tires are new. I have had wheel and balance and alignment done, all within the past six months. Recently, I have noticed that my wheel is steering towards the right when I come to a stop. What could be wrong?

— Brittany

A: Wow, this situation needs a fresh set of eyes, and right away! I’d recommend an alignment/brake specialty shop, as they would have the best experience with this type of problem. It sounds like you may have several issues: possibly a radial force variation problem with one or more tires, a loose suspension component or maybe even a braking problem, based on your recent pulling while braking symptom.

Try to locate a shop that employs a Hunter Road Force Touch GSP9700 balancing machine. This device loads the tire with a roller, simulating the road surface, and measures radial force variation, wheel and tire runout, and lateral force. A tire can be strategically remounted so the stiffest section of the tread corresponds to the lowest point of the wheel and the tires/wheels can be matched side to side on the vehicle to minimize tire pulling. Your symptoms are puzzling but solvable!

— Bergholdt teaches automotive technology. Email questions to under-the-hood@earthlink.net.

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