Hey all,

First off I want to thank everybody for all the quick information and help on the last few problems I encountered with my disc brake conversion....

I am having to fab up some new brake lines from the master cylinder to prop valve, and from the drivers front to prop valve. Anyone know off hand what the fitting sizes are? I know the rear master port is larger than the front, and the rear port on the prop valve is larger than the others as well..... Thanks in advance!!!

I probably won't be a whole lot of help but, 1) I remember there were only the two sizes, and 2) my kit came with extra fittings (in the two sizes) so I had all that I needed to complete my connections.

I checked the Pontiac parts diagrams over at the First Gen Site and they were not much help either.

Yeah I copied your prop valve set up and it worked great!! The M/C lines that came in my kit are not designed for the valve to be mounted that way, however the pass side hardline bolted right up with was a relief!! Now just gotta fab up the other lines and I will be set.....cant wait to drive it!!

So the extra lines you got will not work out even if you bend them some?

If that's the case, then I would figure out what fittings on those lines fit what, cut the supplied lines, recycle the fittings and then get sections of straight lines from the local auto parts place.

Once I mocked up the extention of the rear line that I needed (bends and all), I had a local shop flare the line for me with professional tools. Voila!

2 ways 2 go about it.
Cut and use the original fittings on the new lines.
Or take the fittings to an older parts store, find an older guy and tell'm you need to adapt the new line fttgs to the old ones.

This just occurred to me - aren't "modern" brake line fittings metric?

Well, spent about an hour today at a mom and pop parts store that actually carried brake line lengths, fittings, unions, etc... and I got most, not all, but most of the parts I need. They also let me borrow a tube bender. Looks like most of the smaller fittings are 1/4 inch or 3/16, and the master fittings are larger 5/16. I was able to get a bunch of adapters to use the 3/16 line with a 5/16 adapter to screw into the master cylinder. Unfortunately, my own error at the store got me some wrong fittings, but another trip should solve that so hopefully im only a few days away from filling the system, bleeding, and trying the maiden voyage

Brake lines are a very critical component. If you have ANY doubts about the sealing surface, use your samples and have lines professionally made.

Kinda off the subject.
On cars-n-trucks, yes.
No stores round here that carry metric w/bubble flares.
Have to buy standard tubing w/inverted flares and standard to metric adapters.

Buy a good flare tool and make your own. You'll be able to make custom lines and you'll have the tool for ever. They do come in handy.

I no AutoZone and the like loan flaring tools.

Just be carefull. The one I "borrowed" from Autozone had been trashed by all the previous "users".

That's why I said "buy a good one". Much less frustration. And don't tell anyone you have one or it'll get trashed and then brought back from so called friends.