If you can imagine what this would feel like if you ran your hand along it, then you should be able to imagine what this would feel like if it was mounted on your car!Ĭupping can be caused by alignment problems, or inherent vehicle design issues. If you look along the edges of the tire, you can see that one tread block is raised up, and the next one in the row is almost completely smoothed out, then the next raised again. Even though the tire in the picture is worn out, it clearly shows what we mean by cupping. (You may want to make sure you don't have steel cords showing on the tire first, so you don't get cut!) If the tire is flat, then good, if it has small waves like on the sea, you have cupping. The simple test is to run your hand along the face of the tire, and you can feel it. So if you car shakes at the same speed (or speeds) every time, tires are the first thing to check.įirst Things First: Check for Cupping and Flat Spots Transmissions and drive lines can cause shakes too, but they are not quite as simple to diagnose.Īs stated earlier, tires are very consistent, they will wobble at the same speed every time, whether, you're driving at a constant speed, braking, or accelerating. There are actually many more types of "non-tire" related shakes, but these are simply some of the most common. Experienced mechanics can diagnose this easily, and again, this is the realm of the mechanic. If they become worn, vibrations can show up when accelerating hard, or pulling hills. This type of vibration is usually caused by motor mounts. The vehicle wobbles while accelerating hard, or climbing steep hills In this case, you should see your mechanic, or we can look for the cause if you want, but we don't do this type of repair. So if the vehicle only wobbles some of the time, it is usually a loose or worn out suspension component that is to blame. Tires are very consistent, they will always do the same thing at the same speed. What happens here is that a loose suspension component can allow the front end to start wobbling, like when you hit a bump, and once the wobbling starts, you have to slow down, or even stop to correct it. This is usually caused by loose suspension parts or bearings. Some vehicles can pick up even violent wobbles (oscillation) at a certain speed, but not every time you drive at that speed. The front end wobbles at a certain speed, but not every time you drive that speed: If they are warped, they can be machined (turned) to be straight again, but you can only turn them a couple of times before they get too thin, at which time they must be replaced. If this is the type of shake you have, you should have the rotors checked for warping. Over time, heat causes the rotors to warp and you get a pulsation in the pedal and often in the steering wheel, especially under hard braking. The rotors are the part of the disc brake that rotates, and when you apply the brakes, the calipers squeeze the rotor to make the vehicle slow down. This is very common, and is almost always caused by warped brake rotors (or drums, but usually rotors). It shakes when you hit the brakes, particularly under hard braking: In this article, we will give some simple guidelines to "pre-diagnose" any shakes you have so you'll know where to turn for help.
Granted, tires are the most common cause of vibrations and they're usually the easiest to diagnose and cheapest to fix, but they are by no means the only cause of vibrations. Also, worn suspension parts can allow for vibrations.
In short, anything that rotates can cause vibrations: Transmission, drive line, brakes, motor mounts (ok, the motor mounts don't rotate, but if they're worn, they can allow vibrations to be transmitted from the engine), and of course tires. There are many vehicle conditions that can cause your vehicle to shake.
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