Thank you all! I did 20 tests or more ;). The pump turned on every time (maximum the second time) I press. So now we know it's the pump's fault. Should the pump and the sphere be replaced (regenerated) together or can I do it separately? Does it make sense or not?

Should it be cold or after a long ride? Press and hold or just click the pedal?

Thank you all for your answers! I did a test with nanocom wabco D - sensors voltage and wheel speed. I drove long distances many times, very slowly (over 6 km/h disconnects them from communication). All the time "Wheel speed" were practically identical on all wheels (max differences 0.01-...

Thank you for your answer. Can I find live data from the wheel sensors in Nanocom? If a damaged ABS sensor at the wheel can cause such symptoms, maybe it would be worth disconnecting them one by one? I don't know yet how many presses there are before the pump starts, I'll try to check (when I...

I have a problem with the brakes in my P38 4.6. 2000. When driving, once in a few brakings, the brake pedal is very, very hard to press, so it's hard to brake. And a moment later it works normally. When driving, sometimes (quite often) you can hear something like "trtrtrtrtr" near the brake...