Any of these symptoms are typically caused by moisture or debris entering the sealed hydraulic system. This should not occur and could be a sign of a seal problem in the slave cylinder or elsewhere in the system. ** Any foreign matter in this sealed system could lead to an unsafe situation and should be addressed by your dealer immediately.** Please Note: The above topic includes all makes models. After many miles of road use, it is normal for clutch fluid to require servicing/replacement. Check your service manual for more details.