check each wheel on the inside, if it's a leaking wheel cylindar the inside of the wheel will be wet. If they are all dry, it's probably the master cylindar. May see it below the master on the booster, or it may be going into the booster. It should be visible somewhere, park in a space you know is clean and check the ground in the morning, but checking the tires should tell you if that's the problem.
To fill the brake fluid in a 2001 Honda Odyssey, you need to find the brake fluid reservoir and remove the cap. Fill the reservoir with the right amount of fluid and put the cap back on.
master cylinder
owners manual
Fill the brake fluid...
It uses brake fluid in the brake fluid reservoir. The clutch fluid (brake fluid) is fed by the brake fluid reservoir. The clutch fluid reservoir is just beneath the brake fluid reservoir. So, add fluid to the brake fluid reservoir to fill the clutch fluid, also.
you can only fill your brake fluid from the reserve.
You add some ATF (automatic transmission fluid) and hope your transmission isn't shot. Typical fill level is found with the vehicle in neutral and running (with parking brake on!) and the fluid is warm.
look for a cover that says brake fluid, pull it off, and look on the side of the reservoir it should have a line that says full, fill it to there and done.
Look to see where you fill the brake fluid and where your filling the brake fluid that is the master cylinder.
Use DOT3 brake fluid. It is written on the top of the fill cap.
open the cap on the brake mastercylinder reservoir and fill it to the top with Dot 3 brake fluid.
You should do that through the master brake cylinder.