I can confirm that most VAG diesels suffer with the sinking brake pedal characteristic (having assisted many MOTs over the years). We are a VAG specialist and have seen this characteristic on VAG diesels many many times.
This is a definite characteristic of VAG diesel braking systems as confirmed by the copied and pasted text from the Skoda service bulletin.
Sorry to confirm you wasted time chasing down a characteristic of the system where no fault exists.
Regards,
Jon.
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