Just had a chat with an ex RR mechanic friend who works abroad, I had a rear drivers side break line rupture 6 months ago, I had to crimp off the pipe to get some breaking back to get me to the garage. When I crimped the line I got the initial judder, the break line was replaced but still came back with the initial judder, is it possible there is still air in the system? Shall I do a pressure bleed? M friend said this could be the problem ??