What part of the suspension could be bad on 2004 Nissan Quest

The steering wheel bibrates when driving about 60 to 70 miles per hour some times when I step on the brake peddal at that speed

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1 answer
that type of vibration most likely is tires out of balance if it is only doing it at highway speeds and the vibration on braking is usually brake rotors warped and either can be machined to correct the problem or if they are already below min spec for machining then replace