So does anyone know the answer? What’s the head size? What’s the three, what’s the length?

Hello all Qashqai 1.5dci J10 minor facelift 2010 The issue is a sinking brake pedal, to the floor which improves with a couple of pumps, then sinks again. My first thoughts were master cylinder so I have replaced that with one from a breaker, and fully bled through the system. It’s still the same. N...