Author Topic: Steel line from carb to brake booster  (Read 5753 times)

Offline Stucs

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Steel line from carb to brake booster
« on: April 10, 2017, 12:43:34 AM »
I bent it a bit when trying to undo the fitting. Not enough to fully pinch it though. Will that cause a problem or should I get a new line?  I don't know what it's technically called so I can't find a replacement online yet.


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Offline gunrac

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Re: Steel line from carb to brake booster
« Reply #1 on: April 10, 2017, 04:23:46 AM »
Brake Booster Vacuum Line. Depends on how much constriction it may have caused. Have you tried to blow threw it an checked for leaks. Picture would help.
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Offline VileZambonie

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Re: Steel line from carb to brake booster
« Reply #2 on: April 10, 2017, 06:29:17 AM »
It's so inexpensive, I would replace it or cut it and reflare it.
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Offline Stucs

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Re: Steel line from carb to brake booster
« Reply #3 on: May 10, 2017, 10:03:22 PM »
Sorry for the delayed reply - had trouble logging in the last few weeks!  Doesn't seem to be too constricted. I'll post a photo tomorrow when I've had a chance to take a closer look.


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Offline Stucs

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Re: Steel line from carb to brake booster
« Reply #4 on: May 11, 2017, 05:34:29 PM »
Sorry for the delayed reply - had trouble logging in the last few weeks!  Doesn't seem to be too constricted. I'll post a photo tomorrow when I've had a chance to take a closer look.


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And here are some pics.


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Offline srozell

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Re: Steel line from carb to brake booster
« Reply #5 on: May 11, 2017, 09:27:37 PM »
Is that a crack in the tube at the dented part?
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Offline Stucs

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Re: Steel line from carb to brake booster
« Reply #6 on: May 13, 2017, 05:06:06 PM »
Is that a crack in the tube at the dented part?
It looks like a gouge, but I don't think it goes all the way through. Although maybe it's worth it to replace, just in case?


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Offline gunrac

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Re: Steel line from carb to brake booster
« Reply #7 on: May 13, 2017, 07:28:03 PM »
Don't send a single wrench to do a two wrench job.........lol

Been there done that.     Ya, replace it. Don't forget the Never-Seez.
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Offline Stucs

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Re: Steel line from carb to brake booster
« Reply #8 on: May 13, 2017, 10:19:12 PM »
Don't send a single wrench to do a two wrench job.........lol

Been there done that.     Ya, replace it. Don't forget the Never-Seez.
Can't seem to find that part online anywhere!  Any suggestions on where to look?


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Offline kcwis

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Re: Steel line from carb to brake booster
« Reply #9 on: May 13, 2017, 10:48:12 PM »
Salvage yard,or pick and pull, whatever they call it in your area,,might have to remove carb and turn it instead of posibbly kinking line.
I'd suggest making a list of other items you might need and looking for them at the same time.

Offline bd

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Re: Steel line from carb to brake booster
« Reply #10 on: May 14, 2017, 10:33:39 AM »
If you're unable to find a suitable replacement, the tube can be fabricated easily if you have available a tubing bender and bead former (or double flaring tool) to add a shallow barb on the hose end of the 3/8" steel tube.  The raw materials - straight 3/8" steel tube in various lengths with flare fittings pre-installed - are available at auto parts stores like NAPA.  Cut the new tube to the exact length you need, form a hose barb on the free end and voila!  To form the hose barb using a double flaring tool, just begin to swage the tube using a double flaring die, forming just enough of a bead to retain the hose.

To install the replacement tube, wrap the flare nut threads with two turns of Teflon tape then back up the baseplate fitting in the carburetor and use a 6-point flare nut wrench on the tubing nut to tighten.
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Offline SkinnyG

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Re: Steel line from carb to brake booster
« Reply #11 on: May 14, 2017, 11:28:08 AM »
A flare fitting shouldn't need teflon tape on the threads - the sealing is at the flare. 

Pipe thread uses teflon tape or equivalent, because the sealing is in the threads.

But yeah - easy to fabricate out of 3/8" fuel line as mentioned above.
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Offline bd

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Re: Steel line from carb to brake booster
« Reply #12 on: May 14, 2017, 04:07:27 PM »
A flare fitting shouldn't need teflon tape on the threads - the sealing is at the flare. 

Pipe thread uses teflon tape or equivalent, because the sealing is in the threads.

But yeah - easy to fabricate out of 3/8" fuel line as mentioned above.

Teflon tape on a flare fitting connection isn't for sealing the thread; it lubricates the thread so the tube fitting can be tightened properly to seat the flare without distortion.
Rich
It's difficult to know just how much you don't know until you know it.
In other words... if people learn by making mistakes, by now I should know just about everything!!!
87 R10 Silverado Fleetside 355 MPFI 700R4 3.42 Locker (aka Rusty, aka Mater)

Offline SkinnyG

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Re: Steel line from carb to brake booster
« Reply #13 on: May 14, 2017, 10:59:53 PM »
Well that makes sense.
The Crusty Chevy: 1977 Silverado, shortboxed & dropped, potato-potato.

Offline Stucs

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Re: Steel line from carb to brake booster
« Reply #14 on: May 14, 2017, 11:00:11 PM »
Thanks guys!  I'll give that a shot. I don't have the tools yet but wanted to also work on some corroded brake lines, so might as well tackle both jobs.


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