Into the frame? I guess it's possible, but it seems like there would still be some sign of a leak around the proportioning valve(I'm assuming that's where he thinks it might be leaking from).

Have you filled the reservoir up again yet, and pumped the pedal to see if it would pump up?

yes but need to bleed the lines,have to wait for better weather. where would i put the floor jack to raise the car to

I put my jack under the side of the frame, ahead of the rear tire, and jack up one side at a time. Then I put the jack-stand just behind the jack, on the frame. Trying to jack one up from the diff is really hard...especially with the spare tire under there!

I put a 4x4x4 chunk of wood on the jack pad.  That fits right up in between the pipes to the diff.  And I come from the side of the car with the jack not from behind.  Easier to see that way and a little more clearance since the front is already up on stands.

Using a floor jack, I would raise the front at the cross member. I always use a piece of scrap wood between the jack pad and the vehicle whenever I lift the vehicle. And place a couple of jack stands either directly under the A-arms or under the frame rails somewhere securely between the A-arms and just rear of the front tires. At the rear, I always jack at the differential and put the stands at the frame rails either just ahead of or behind the rear tires, whichever is the safest and most accessable to do. I NEVER jack the side up at any time, that is putting too much pressure at points that don't really like it. If you do, notice all the crunching and crackling noises. That's from the frame and fiberglass twisting. Good luck, hope you find the problem. And whatever you do, make sure you take your time to do it safely.

Check out This thread on jack placement...

[QUOTE=Adams' Apple]Check out This thread on jack placement...[/QUOTE] Joel.......it doesn't work.....

Story of my life!
The thread is from 3 years ago...if you do a search, it comes up, but will only be valid for a certain amount of time. I guess it is due to it being an archived thread....
Anyway, just do a search on "Jack Placement"...

Hi Rick. I had a similar situation on my 71. The front bowl went down. Like you I didn't see any actual puddle under car, but when I got it up on the hoist the line going to the left front caliper was leaking. The only indication was a stain on the back side of the caliper that I couldn't see until I got the wheel off. The mystery was why did it decide to start leaking? I replaced the  line and so far so good.

You'll figure it out. "T"

One thing we have all forgotten to notice is that the front brakes have obviously failed, too.  The design of a dual master cylinder is such that one end can fail and the other end still work.  I would guess your rears have not worked for some time, and now the fronts failed.

Larry