Just had my 01 in the shop looking for a leaky brake cylinder or possibly leaking into the booster and being sucked into the intake. Every inch of line and possible leak spots came up dry. Was actually hoping it was getting sucked into the intake, to account for the off beat shimmy or stumble that happens at idle only.
Any ideas where the fluid could be going? Had to top it off from add line three times in last 5,000 miles. It's a stumper. Checked proportioning valve, also pulled the master cylinder to check the rear seal and dry as a bone. As well as the calipers.

 

Pull the drums, and have a look.

How are your front pads?

 

Pulled the drums first thing. Just had the front pads and right front caliper replaced three weeks ago by the same shop. Had all four wheels off looking for a leak. Got to be going somewhere. But where?
And the brakes work fine, i should add.

 

Check on top of the gas tank for a puddle of fluid. that's about the only place I can think of where it could leak, but, not show up on the ground right away.

Sure someone isn't stealing it?

 

Will double check that they looked there. Thanks.

 

I had a similar problem but I had leaky wheel cylinders

 

They used a mirror and flashlight to look above the gas tank. So we'll just have to wait for it to get worse.
Don't think it's theft, although a girl I used to know often stole stuff from my engine bay, and she's not around.

 

Based upon what you've mentioned so far, I'd bet on the rear brake line. It's famous for rusting out behind the gas tank where you can't readily see it well.