A car shakes while driving because of problems with the suspension or wheels that cause these elements to not sit properly and therefore shudder as the vehicle moves forward. Shuddering often intensifies the faster the vehicle moves. Shaking and tremors occur in the steering wheel as vehicles reach higher velocities.
Shuddering and shaking are common side effects of issues with infrastructure related to the wheels. Elements such as axles, tie rods, struts and treads cause concerns with how the car moves forward. When there are issues with how the wheel sits beneath a car or how it is connected to the steering mainframe, it can affect the way in which the wheels respond to commands to turn and react to driving situations.
Alignment problems with tires and brakes often result in shuddering and shaking issues. Friction causes quavering in a machine, and the faster these devices travel, the more remarkable the effect becomes. This holds true on the small scale as well as in motor vehicles.
There are rare occasions where the shuddering in a vehicle is linked to troubles with the engine. Problems in this area are linked to shuddering and shaking when the engine backfires or when there are issues linked to mounting and engine infrastructure.