Brake Bleeding

[dksob81]

I am working on a 2000ish kia spectra, the brake pedal goes all the way to the floor, Master Cylinder was empty. I filled the master cylinder, pressed the brake pedal about 10 times, got under it to find the leak - nothing! dry as a bone! Pumped the pedal another 20-30 times still nothing, no leak anywhere, so I decided to try and vacuum bleed the system and I cannot get any fluid to come out.
I only tried the left rear wheel, but still after an hour of vacuum bleeding I should see some fluid from somewhere. So I got back in the car pumped the pedal probably 60-70 times and still don't see any leaks anywhere.
I followed the lines from the master cylinder to the Proportioning valve to the front wheel and to the rear wheels and there are no signs of leaking anywhere, the lines are in surprisingly good shape, I was expecting a severely rusted portion which it could leak from but the lines are fine.

"Where did the fluid go?"
and more importantly "Why am I not getting any fluid to come out?"

[dksob81]

Its a 2003 Kia spectra.

Well I went ahead and bled the rest of the brakes, the front brake bled out good, but neither of the rear brakes are getting fluid.

[dksob81]

Apparently this forum isn't too active but I will post my fix just so the next person will know what I found.

The proportioning valve was bad not allowing fluid to the rear brakes - I replaced it, bled the lines and the brakes are fine. it seemed to be leaking from the left rubber boot as well.

[Franco2112]

Thanks for the post. It will help someone down the road.
Franco