Sedanman
67-9 Valiant specialist
I have parted out many cars and every once in a while I come across a car with these brass fittings on the master. Any clue?
What are these fittings for?
- Thread starter Sedanman
- Start date
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69_340_GTS
Well-Known Member
The brass ones? Look like adapters. Not all master cylinders are machined with the correct sizes/threads to match up to OEM Mopar brake lines. Or... the exact opposite. Hard to tell exactly what they are, but it looks like the one on the left is stepping it down to a smaller fitting size.
ScampMike
Despicable Damn Yankee
especially true if there has been a MC swap or brake line work.. my car has a booster which was retro fitted in - one side of the MC has an adapter on it
Sedanman
67-9 Valiant specialist
I don't run across them often but every now and then and was just curious
searcher1990
Well-Known Member
i have used those before when converting from manual brakes to power brakes.
I've actually encountered this as the norm. I don't think many MC's actually have the standard 3/16 brake fitting actually in the MC. At least my old mopars haven't. or at the very least, a big brass fitting with a smaller 3/16 bore and flare.
Some assemblies have 2 line fittings of the same size. Others have 2 completely different sizes. So lines can't be crossed and wrong master cylinder would not install. Adapters made any combination possible, right or wrong.
BillGrissom
Well-Known Member
Several possibilities. Perhaps a "residual valve" (unlikely). Remove and see if the male side is pipe thread (NPT) or inverted flare. Early single-pot MC's had an NPT port, with brass adapter to convert to inverted flare (similar to carburetor fuel fittings). Perhaps the earliest dual MC's had that. When they changed to dual MC's all brake tubes became 3/16" tubing (OD) vs 1/4" seen in early cars. To prevent wrong connections, several sizes of tube nut are used w/ 3/16" tubing. BTW, I have used tubing from 1990's cars w/ bubble-flare fittings and installed dbl-flare nuts. Though spec'ed in mm, it is the same or close enough to 3/16" to work fine.
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