I have a 2000 Dodge Sport Gran Caravan with a 3.3L engine, auto, pwr 4 wheel disk brakes with 102,000 miles. For the past two years I have had to add brake fluid about every 6 months. I had the front disks replace 6 months ago and the system was inspected at the time. There doesn't appear to be any visible signs of leaks in the brake system but the fluid manages to disappear somewhere. The van is parked in a spotless garage every night and there is never any sign of a leak from either the master cylinder nor any of the wheel cylinders. The first indication I get is when I make a left-hand turn, the brake light comes on for a few seconds. Does anyone have any ideas or have you experienced a similar problem?

 

look closely at the brass washer between the flex line and calipers they maybe sweating enough for 6 months down the road
or just snug them bolts at the fittings