I have a 67 with manual brakes, 4 wheel drums. My rear brakes will not operate when I push the brake pedal. I was thinking it was the wheel cylinders freezing up so I changed both sides. When trying to bleed the brake lines I found that I have no fluid at the rear brakes, either side. The brake pedal is hard as a rock and the front brakes work. Any thoughts, maybe the proportioning valve? There is also a junction at the rear end where the lines go to each side. Could it somehow be plugged?

I would see if your getting any pressure from the master cylinder,have someone pump/hold the brakes while slowly open the line at the master.You should have good pressure-if not you have a bad master cylinder.

If my master cylinder was bad wouldn't it be leaking or not operating the front brakes as well?

it sounds like the proportioning valve is stuck if you can't push any fluid out of the back bleeders when you push on the pedal.

KOCHESE,67 has a dual reserve-one part of the master can be working(front) and the other not,a bad piston seal can cause an internal leak(no fluid leaking/no pressure)Thats way i recommended to check pressure from the master cylinder first. graemlins/thumbsup.gif

Thanks for the help, back to the wrenches tomorrow.

I had the same problem after rebuilding my brake system, everything but the proportioning valve.
I could not reset the valve, I could not get fluid to the back even using a vacuum bleeder.
I got a wildwood adjustable proportioning valve
like they use on stock cars. I put that in and everthing was fine and you can adjust the brake bias to fine tune it if you like.