Can I ask with which you did that? Because I use the same setup with a Lotus and I couldn't get the time down to 1.38
Have a look at JB's lap on F1.com... I must say that is one of the hardest corners in the game, if not the hardest. There are two ways you can do it; you can stick tight to the kerb on the right by balancing the brake and throttle, or you can take a wider approach by touching the apex at the start, let it run to middle of the track and then hit the brakes hard. Second option is probably easier, but the first option is what real F1 drivers do - your choice really.