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clutch engagement/disengagement
sound like one of 2 (or both) problems exist-- the flywheel is glazed -- the friction surface has been heated to the point of drawing the binders out of the pressure plate and plastered themselves on the face of the flywheel, resulting in a glass like surface contact area. similar to happens when brake pads are heated (overheated) up enough of glaze the brake discs -- causing a vibration in the steering wheel on hard decel at speed.
or there is something bad going on with the dampners in the dual-mass flywheel. if a dampner spring set fails, the shock load is not properly distributed -- clearly evident by a ratcheting type engagement (letting out on the clutch)...
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