Hello, with our Yaris the clutch squeaks while stepping temporarily. Only during the pedal movement, so no bearing or something like that. Have already found out that it is the taker cylinder in the engine compartment, you notice the vibration when touching. Now there is a covered opening on it. What comes in there, lubricant for the cylinder or is the opening for the venting after brake fluid change? Already someone heard of this problem and possibly a solution in stock?