Last year, I had the same problem and the dealer said they could try the shuttle valve fix but it was a 50/50 chance of it solving the problem. I had them do the $600 repair hoping that was all it would take. Well, of course it did not and it came down to the ABS modulator. Not wanting to spend 2500 to get it done, I went to a Land Rover dismantler in the area and picked up a used one for 500 and put it in myself. It was easy to put it in, but bleeding the brakes was a pain. Ever since then, I have not had one Three Amigos problem. I sure hope it lasts.