hi, my audi a3 sportback 2.0 tdi bkd engine has a clutch fault. Just recently, the pedal went soft and would stick to the floor. I thought the brake fluid was low a little, so i topped it up, and all was good for another week. Now, it did it again, where the pedal went soft and the clutch would stick to the floor. I checked the brake fluid and that hasnt moved one bit, so it cant be leaking anywhere. Ive checked the external of the car and id assume the internal is fine too. It is driving fine again, but i do remember pumping the clutch pedal 5-10 times and i felt it get harder etc. Its been driving fine now, but i want to correct whats wrong. Am i right to think that the master cylinder is shot or is it a more complicated problem.? All help will be appreciated.