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Originally posted by 69maverick:
I haven't done what you did but I think you need a perportioning valve? The other thing I was thinking about is Volume of fluid,Do you have enough? You may have to use larger lines?

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I have a Wilwood proportioning valve mounted under the back seat much like shown in the Boss 302 chassis book.
I don't think the brake line size is my problem...

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Originally posted by jkilroy:
Whats the bore size on that master? You might not be getting enough volume. You can try a master from a late 80's lincoln, which has a 1 1/8 bore. The other upside is that they are aluminum and weight about 1/4 of the iron ones.

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On my Capri, which has the factory discs on the front, and Lincoln Versailles 9 ? rearend and disc brake system in back , I used a master cylinder from a mid ?80?s Lincoln Continental with 4 wheel discs. I think, but am not certain,that this is the same as was used on the SVO Mustangs of that era.

It works quite well. The pedal is very firm,and does require some muscle power to push it since the bore is quite large for a manual system,but it stops my car in a hurry at the end of a run,and I am confident it would work as well on the street. In fact the friend that bought my ?68 Mustang is using the same master cylinder in it after he converted it to 4 wheel discs,and he says it works quite well once you get used to it. I?m sure it works a heck of a lot better than it did when I had it,it had 4 wheel drum brakes then.

As far as the bleeding troubles, it could be a lot of things. A leak in a fitting, a different bleeding method might be needed, the brake lines might be higher than the master cylinder, maybe the master cylinder itself might be bad. If it is old or used,maybe it is pretty well spent. And don?t assume that if it is new, that it will be good. We wasted several days when we were getting Dad?s ?72 Pinto ready this spring trying to get the brakes to bleed, to no avail. Over a gallon of brake fluid later,we took the thing off, and exchanged it for a different one, and in 10 minutes the brakes were bled.

I should also add that it was really tough to get mine to bleed as well, but this was a completely dry system at startup, and it takes a lot of messing around to get all the air out. Doing it completely alone doesn?t help either. You might want to rig up a pressure bleeding apparatus. This will save a lot of time,and will be a lot more effective than the old pump and bleed method. It doesn?t have to be anything fancy. A tire pump, and a modified master cylinder cap will do in a pinch.