Interesting about the master- the new one from Jose Franssen on my 49 11BL would lock up. There’s a brake, then the pedal seems to hit something halfway down in its travel and would stop dead and then no brakes. I’ve only driven the car around my neighbourhood, but there’s a lot of pedestrians. A bit disconcerting to say the least. Franssen sent me a new one that I have yet to install and they want the old one back. Is everyone on the continent getting theirs from the same manufacturer? When I pull the bad MC I plan to disassemble the brake pedal linkage just to check it.