What Causes the Thud Sound When the Car Starts Moving?

[Gwen]

There are several reasons why a car makes a thud sound when starting to move: 1. Failure of the half-shaft or CV joint components; faults in the chassis suspension components, such as lack of lubrication, wear, or deformation. 2. Malfunction in the chassis steering mechanism components, such as tie rods, upper and lower control arms, ball joints; issues with the front or rear wheel bearings, caused by wear, lack of lubrication, or burning out. 3. Tire deformation or irregular wear due to wear or inherent quality defects; problems with the front or rear axle (differential) due to lack of lubrication, component damage, or quality defects. 4. Issues with the shock absorber part, such as the thrust bearing (or top mount); problems with the front or rear brake pads, such as excessive wear, use beyond the service life, or quality defects.