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Unread 08-20-2013, 09:40 AM   #1
Jeepnovice
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Brake line nuts wont screw in

So I just got this 99 xj. I finally got it to start now I'm trying to replace rear metal brake line. The line is in but the nuts won't screw in the fittings properly. The rear bolt won't screw in at all and the end that screws in proportioning valve won't go in all the way n leaks oil out. Pls suggestions!

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Unread 08-20-2013, 11:19 AM   #2
CJ7-Tim
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Either you got the wrong size flare nuts, or else you are not getting them squarely lined up to start on the threads. The metal line can push or pull the flare nut just enough so that it doesn't line up with the threads.
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Unread 08-20-2013, 01:07 PM   #3
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Yep...a little finesse. I always have a b***ch of a time with those too. Pull the fitting one way all the way towards the hole, pull the line straight back the other way, making sure it's 90 degrees to the threads (and you may have to alter it by a degree or two either way.
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Unread 08-20-2013, 02:24 PM   #4
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Quote:
Originally Posted by Jeepnovice View Post
So I just got this 99 xj. I finally got it to start now I'm trying to replace rear metal brake line. The line is in but the nuts won't screw in the fittings properly. The rear bolt won't screw in at all and the end that screws in proportioning valve won't go in all the way n leaks oil out. Pls suggestions!
Did you make this line yourself?

I think you'll find that the nut at the proportioning valve is Metric.
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Unread 08-20-2013, 03:30 PM   #5
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Here's a pic that shows the small dogleg tube that goes to the proportioning valve and it's flare types and wrench sizes. If you used an OEM tube assembly that goes all the way back to the rear axle the flare nut that connects to the dogleg should hook right up.

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Unread 08-20-2013, 03:43 PM   #6
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Doleg doesn't go in right in the proportioning valve. That's the issue
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Unread 08-20-2013, 06:33 PM   #7
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Quote:
Originally Posted by CCKen

Did you make this line yourself?

I think you'll find that the nut at the proportioning valve is Metric.
No I got the line premade at dealer
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Unread 08-20-2013, 06:41 PM   #8
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Doleg doesn't go in right in the proportioning valve. That's the issue
Sorry, it's Dogleg, not Doleg. My misprint. LOL

Verify that the flare end that goes into the proportioning valve is a conventional double flare (SAE), not an ISO Bulb type flare. Examine the threads on the flare nut-make sure they're not crossthreaded. Same with the female threads in the valve.

If neccessary, loosen (or totally disconnect) the Metric coupling enough to allow you to go straight in with the SAE end. Carefully start the threads and once they start you should be able to turn the fitting in by hand.
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Unread 08-21-2013, 09:46 AM   #9
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So I disconnected dogleg and was able to screw it in just fine. Same thing w rear flare. But it was too difficult to connect dogleg w rest of line while it was in valve s I took out and lord n behold it did not want to thread in w like all connected. I guess I'm further in the process now that I was before! Thank you I ll try again tomorrow.
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Unread 08-21-2013, 10:29 AM   #10
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It can be nerve wracking because of the limited space to work in. Just loosen the nut that goes into the proportioning valve enough to start the Metric couplings. Then tighten them, then tighten the valve nut.

I had to use short open end wrenches to deal with the Metric coupling nuts.
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Unread 08-21-2013, 11:41 AM   #11
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Quote:
Originally Posted by CCKen
It can be nerve wracking because of the limited space to work in. Just loosen the nut that goes into the proportioning valve enough to start the Metric couplings. Then tighten them, then tighten the valve nut.

I had to use short open end wrenches to deal with the Metric coupling nuts.
No kidding ! its one of the most frustrating things I've done.
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Unread 08-21-2013, 02:45 PM   #12
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No kidding ! its one of the most frustrating things I've done.
The party has just begun.

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Unread 08-21-2013, 11:28 PM   #13
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^^^^^^^

Brakes can be the absolute worst sometimes.

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Unread 08-22-2013, 09:30 AM   #14
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Wtf! I just tried w dogleg lose n did not work. I guess my next step is to remove proportioning valve, which is gonna b another pain! I already picked one up at junk yard and the dogleg goes in just fine. I'm worry about rear nut of valve it was hard to remove when I got used one. I thought this would be easy oh was I wrong!
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Unread 08-22-2013, 06:22 PM   #15
oakmckinley
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Make sure to use flared line wrench. You'll only wreck the nuts if you use a standard open ended wrench.

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