Rear disc update once again

[swervin ervin]

OK. Here goes. This is for anyone who is wondering where I'm at with this and also, maybe someone can help me with my problem.

First let me state, I'm no dummy. I can bleed brakes and understand how it all works. So, with this said, here's my problem.

I've got everything hooked up. My new custom park brake cables came today. Went on great and they work fantastic. This isn't the problem. The problem is I can't get a good pedal, no matter what I do. Here's what I've done. First, I used all new parts. Disc/disc master cylinder, disc/disc combination valve, 80-85 Seville calipers. The whole nine yards. I have bled everything, many, many, many, times. Bench bled the master, even called the company I bought it from and had them send me another one. So, I'm pretty sure the master isn't the problem. I even went to Advance and bought some cheap regular calipers made for a Monte Carlo to try, thinking it may be the Seville calipers. Still nothing. Called the techs at Master Power Brakes, where I got the master can valve at today. He said it may be my initial park brake adjustment. Tried his suggestions. Nothing. I'm about to pull out what hair I have left here.

The only thing I've not changed that maybe could be causing this is the new combination valve. I've searched everywhere on the net I can think of trying to find a valve off a 77-78 Seville, which had 4 wheel disc brakes. I can't find anywhere that sells these things. If I could find one local, I could try it and if it fixes my problems, could send the brass one I bought back for a replacement. I could also take the Seville valve back for refund too. I hate to send it back without knowing if it's bad. I already did this with the master. I plan to call them tomorrow and see what they say about the valve.

I'm no expert on combination valves, but I'm thinking it may not be allowing enough pressure to the rears. This is a disc/disc valve and is supposed to take the place of using an adjustable proportioning valve. For sure, I know there is no way any air can be in the lines or calipers. I've bled them to many times. I've bled the calipers on the brackets, off the brackets, upside down, sideways, and any other way you can think of. I've gravity bled, vacuum bled, done the two man bleed job with the peddle. Even bought a one man bleeder kit. Pretty neat little item. A plastic bottle with a magnet on it. You hook it up and pump the brake pedal.

So, I'm at the end of my rope here. Something that should be so damn simple is driving me totally nuts. If the combination valve isn't it, I don't know where to go next. So, does anyone know where to get a valve for a 77-78 Seville at?