Clutch problem

[kenclarke]

Clutch problem with sons car, it's a 1.9 tdi with 6 speed box.
Previously we've changed the master cylinder and the pedal when clip broke. Now he's saying pedal is going to floor but then car lurches forward as though pressure has been lost, not losing fluid. Could this be seals passing in one of cylinders, if so which is most likely. Or could it be a thrust plate or bearing issue. Clutch isn't slipping at all.

[grant19841]

Is the fluid level ok or its possibly air in system try bleeding it and topping up with fresh fluid if low.

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