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Old 12-30-2001, 07:30 PM   #1
Corn-Picker
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Question How are you supposed to torque a fluid line?

When installing my stainless steel brake lines I noticed that they had torque specs on them, 12-24 foot-pounds. How are you supposed to torque fluid lines? Because they are a line, I simply can't put a socket over them and use my torque wrench, because there is no way a sockect can fit over a line.

Is there a special tool for this, or is the brake line manufactirer just trying to cover thier ass from someone who overtightens the lines and leaks brake fluid?

I just tightened the lines up "real good" and hoped it's close to the correct torque spec... I'll just be sure to check my brake fluid over the next few weeks.
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Old 12-30-2001, 09:30 PM   #2
Bimmer
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There ARE ways to adapt an open-end to your torque wrench, but it's a huge PITA and not worth it, IMHO.

IMHO, the manufacturer is just trying to cover his ass... figure that if you've got a 12" long open end wrench, you want to put 12-24 lbs. of pressure on it, and that sounds like "real good" to me.
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Old 12-31-2001, 10:28 PM   #3
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The easiest and only way as far as I know or am concerned because it works just fine for me, to torque a fitting is with a crows foot of the correct size attached to a torque wrench.
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Old 12-31-2001, 11:20 PM   #4
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Okay, the "crow's foot" is the short piece with the socket at one end and the open end wrench at the other, right? That's the alternative I was thinking of, but it's a PITA, because it's my understanding you have to re-calculate the torque wrench readings because you've increased the length of the lever...

Bottom line: "real good" is probably just about right. I'd worry more about over-tightening your brake lines than not getting them tight enough.
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Old 01-01-2002, 05:23 AM   #5
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hmmm, the crow's foot has a 3/8, 1/4 (or possibly a 1/2) square hole in one end and a open end wrench head on the other all about an 1 or so long. Now since there is no lever as such in use by way of the crow's foot in the operation of torque wrench then there is no increase/decrease in the application of torque over what is indicated on your torque wrench. Where I work there is an enormous amount of technical guidance on the use of torque wrenches and their appliction of such. We use crow's feet often and do not change the torque value applied when doing so. Either way a 12-24ftlbs variance is quite large and leaves room for error. Good and snug I always say.
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Old 01-02-2002, 06:56 PM   #6
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On the C-130 aircraft I work on we torque to 30ft lbs. But all hydro fluids are under high pressure at 3k psi. On other AN fittings tighten till snug then add 1/4 turn. This has worked on my other cars so far.
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