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Rear brake hard lines...

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Old 01-22-2009, 04:45 PM
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Default Rear brake hard lines...

Anyone know what size the rear brake hardlines are? The ones that run from the splitter alone the rear axle and plugs into the wheel cylinders? I have the option of 3/8", 1/4" and 5/16".. I want to replace them on a D35 out of a 91 XJ. I also plan on upgrading to disc brakes on it so that could be a factor. Just want to make sure the fitting is proper.
Old 01-22-2009, 04:49 PM
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Wish I could help you, bro. You finally stumped me on a 91 XJ question.... My 91 XJ Sport had a Chrysler 8.25 in originally. Now it has an 87 XJ D44 in it.
Old 01-22-2009, 04:51 PM
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I thought they were 3/16. I could be wrong. Easy way to tell is if you go to the parts store have them pull a wheel cylinder and then just find the break line that screws into it.
Old 01-22-2009, 04:54 PM
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I tried looking in my 91-93 Jeep Parts book but only gave part #s no sizes. Sorry.
Old 01-22-2009, 05:30 PM
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Yeah I looked there first but no sized..I know we have a guy or two who work for a jeep place so maybe they might know. Going to goto napa tomorrow and see if they know.
Old 01-22-2009, 07:44 PM
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most are 5/16..........
Old 01-23-2009, 09:35 AM
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Just make sure you get the same size lines, the fittings you can always cut, change and reflare... Going up/down in line diameter will increase/drcerase brake pressure and biasing on that particular axle/wheel.
Old 01-23-2009, 09:37 AM
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It is 5/16th had to replace them several times...
Old 01-23-2009, 09:53 AM
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Thanks gang...

Stryker did you buy them locally or did you order them online? I know quadratec sells them in a 20ft kit with fittings..
Old 01-23-2009, 10:20 AM
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I would go to advance auto and get a section of 5/16 and a Brake line bender with the flaring tool and make my own.
Old 01-23-2009, 10:21 AM
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Originally Posted by okcjeeper
Thanks gang...

Stryker did you buy them locally or did you order them online? I know quadratec sells them in a 20ft kit with fittings..
I got it at auto zone and they have different length you can pick up. HOpe you are good with a flaring tool... if not use compression fittings
Old 01-23-2009, 10:42 AM
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Originally Posted by XJ Stryker
I got it at auto zone and they have different length you can pick up. HOpe you are good with a flaring tool... if not use compression fittings
My neighbor is so he said he'd help me flair the fittings..
Old 01-23-2009, 11:05 AM
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I was wrong it is 3/16th hope you didnt buy any yet oops...


I was really doubting the 5/16th i said. So I actually used the search feature and found the correct size.
Old 01-23-2009, 11:07 AM
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lol no worries I hadn't bought anything yet.. Havne't seen anything other then 5/16,3/8 and 1/4 online though..I'll call the parts house..
Old 01-23-2009, 11:11 AM
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ok just got off the phone with the parts house and they have 3/16 so I will pick some of that up today.


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