[jwheel55]

Water in the brake fluid is caused by the fluid being hydroscopic which means it attracts moisture from the atmosphere. This has the affect of lowering the boiling point of the fluid which under long heavy braking which heats the calipers causing the the moisture in the brake fluid to vapourise. This just makes the brake pedal sink further to the floor because the vapour being air is compressable. This isn't your problem I would say. Conventional brake fluids should be changed regularly to avoid this problem and the internal rusting of the system that can occur. I use a silicon based fluid in my car which stops the rusting and avoids the vapour problem as it doesn't attract moisture. I'm not sure it is advisable to use it under racing conditions but I'm sure some of our racing friends will advise. Jonny.