what is the reason a car shakes once it's on the highway?

Answer 1

If you are talking about when the car is running at speed, perhaps the front wheels are out of balance or the front end needs alignment.

Answer 2

When a car shakes at speed, it's ALWAYS a balance problem, whether it be the tires or wheels. When a front end is out of alignment, it will pull to one side, or cause uneven treadwear, either outside or inside. If you have worn tie-rods, ball joints, or other suspension bushings, the shaking will be more pronounced. If your suspension components are not worn, the shaking will quickly wear them out! Sometimes if the balance weight on the driveshaft of a rear-wheel drive vehicle is missing, it will cause some shaking, but usually not very severe. It's worth checking out if your vehicle is rear-wheel drive.

Answer 3

Either your front wheels are out of alignment, or the tires are going bad, probably the former. The vibration is always there but at low speeds it's not so noticeable and harder to tell from the patterns in the road surface.

Answer 4

Could be any number of things but if only at speed then possibly tie rod ends in steering - they can shake violently and can be dangerous. Have it checked out soon

Answer 5

if that is a new development, then see a mechanic, and get your balljoints etc checked. Shaking is caused by harmonics travelling through the car, through inadequate suspension system. Your tyres may also be underinflated or knackered or your wheels may be unbalanced.

Answer 6

poor wheel balance and alignment.. check the tyre pressure too..

Answer 7

tire balance or alignment problem.

Answer 8

tires are worn and not balanced