The first phenomenon you described is due to the noise of diaphragm spring of clutch pressure plate. When stepping on the clutch, the release bearing will press the diaphragm spring of the clutch pressure plate, and there will be friction between the diaphragm spring and the fulcrum, so some noise will be generated. These noises have no influence on the use safety of vehicles and the service life of parts, and can ensure your normal use.
The second phenomenon you described is caused by the rotation of the clutch release bearing when it contacts the clutch pressure plate. The sagitar car adopts a hydraulic clutch system, and the jitter of the release bearing will be transmitted to the pedal through the hydraulic pipeline. This jitter usually occurs in the high-speed range. The higher the speed, the more obvious the jitter will be. This is also a normal phenomenon and does not need to be fixed.
I hope the above answers are helpful to you, thank you!
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