Judder Normally a condition associated with some sort of radial imbalance, wear or warping of the flywheel, clutch disc / pressure plate, or the brakes. Judder is a low frequency vibration that is experienced when either of these devices are being engaged or brought into operation
In Physics, Jounce is the fourth derivative of position with respect to time. Jounce is also known as the changes that occur in acceleration over a time. Jounce generally occurs in upward. However, if there is downward reaction of the movement then it is known as rebound. The buffer found above the strut is called as jounce buffer.