I just got my VX about 2 months ago and it has driven fine. Last week the brakes started to feel soft. I replaced the master Cylinder diaphram because it was stretched out and wouldn't fit back in. Today, as I happen to be leaving Isuzu service my brakes failed completely. After an inspection I was told the brake fluid was contaminated with water and all my seals were ruined. Also the diaphram I put in yesterday has already bloated up because of the water. I was told the repair could run $9000.00 or more. Oh my God.
Anyone have an issue like this before and how extensive did the repair go?
Please tell me replacing the master cylinder and flushing the system fixed it.

thanks