Today I replaced the brake valve. Old one leaked to interior, hissed all the time and drained a lot of LHM to return. Pressure regulator kicked every 1 s (regulator interval currently is 150-153 bar, but that is a separate issue). After replacement regulator kick every 12 s. Nice.
Took one from an ABS BX. According to catalogue it should be the same, but valve from ABS has rear brake output at the top instead of side as in regular BX. Fortunately, pipe is not enough to reach after some bending.
Salvaged valve after cleaning below.
I plugged all ports with scrap pipes to protect from dirt while washing outside. Didn’t touch insides.