brake line repair - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


1992-1999 Series I L27 (1992-1994 SE,SLE, SSE) & Series II L36 (1995-1999 SE, SSE, SLE) and common problems for the Series I and II L67 (all supercharged models 92-99) Including Olds 88's, Olds LSS's and Buick Lesabres Please use General Chat for non-mechanical issues, and Performance and Brainstorming for improvements.

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Old 07-24-2006, 10:03 AM   #1
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Default brake line repair

Instead of bumping my other thread I'll start a new one for a couple new questions. I scoped out my brake line rot yesterday, tried to remove the section but the fittings were too fused and I can't get it off.

How much would I expect to pay to have a shop replace a 5-6' section of line, or less?

If I somehow do it myself could I use a compression union even though it says not to use it on brake systems? These unions supposedly flare the tube on their own according to the parts guy.
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Old 07-24-2006, 11:59 AM   #2
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A compression fitting crushes a ferrule (looks like a bead) onto the tubing decreasing the diameter of the tube underneath it in a process called swaging. If the fitting is tightened too far, the tubing can be damaged, if not enough, the ferrule may slip allowing the joint to leak under pressure. Either way, a slight restriction of flow is produced in the line.

Compression fittings are not as safe as flare fittings, and are not recommended for brake lines.

It is typical to find brake fittings rusted and stuck together. Often, you need to go to the nearest brass fitting in the system. They usually can be undone. This is a great place for PB penetrant and patience. Also, use line (flare) wrenches that tightly fit the nuts you are trying to undo.

A shop might charge $100? Just a guess.
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Old 07-24-2006, 12:24 PM   #3
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I'll second the recommendation of PB Blaster, patience, and buying the correct size flare nut wrenches if you do it yourself. Those wrenches are worth the money, IMO.
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Old 07-24-2006, 08:09 PM   #4
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Quote:
Originally Posted by lash
I'll second the recommendation of PB Blaster, patience, and buying the correct size flare nut wrenches if you do it yourself. Those wrenches are worth the money, IMO.
Thanks guys. Though it was just a guess, $100 would be worth it to save myself the headache. But I don't even have "flare" wrenches. Didn't know I needed special ones. I'll be getting PB blaster soon.

I don't have ANY (well, very little) brake pressure. I used to have normal pressure though it was leaking, but I guess it got so bad now I have barely any all the time. Really not good considering I drove 90 miles a day.

I found one of the brass fitttings in front of the gas tank. That'* the nearest one, and to the wheel it'* about 6' bent line. I hope the PB works, if it doesn't I don't know what I will do..

What is the size of our fittings on the lines? It looks like the ones on the line I bought are the right size, but that'* just the threads, the actual head of the nut is smaller.
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Old 07-25-2006, 02:21 PM   #5
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I don't remember off the top of my head what the wrench size is for the brake line fittings. I'll have to check when I get home tonight.

Unless someone else on here today can remember first....
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Old 07-25-2006, 08:00 PM   #6
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Quote:
Originally Posted by lash
I don't remember off the top of my head what the wrench size is for the brake line fittings. I'll have to check when I get home tonight.

Unless someone else on here today can remember first....
Ok, if someone remembers that'* cool. Otherwise I'll figure it out myself when I go to fix it Saturday. I'm not looking forward to it.
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Old 07-26-2006, 10:12 AM   #7
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It was pouring rain when I got home last night, then I forgot to get that nut size for you...sorry...
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Old 07-26-2006, 10:19 AM   #8
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Quote:
Originally Posted by lash
It was pouring rain when I got home last night, then I forgot to get that nut size for you...sorry...


J/K

If you get around to it...no biggie
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Old 07-27-2006, 09:48 AM   #9
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I just though of another question. If I do not remove the fittings from the very ends, and just cut out a section, what do I use to join the two flare nut fittings that will be on both ends, since the unions are not recommended?

I'll try to remove the ends first, but even if I do my section of line isn't quite long enough to bend like the original and I'll probably have to cut and flare ends. I'd love to avoid that but it probably won't happen.
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Old 07-27-2006, 09:50 AM   #10
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Quote:
Originally Posted by bonnie94ssei
I just though of another question. If I do not remove the fittings from the very ends, and just cut out a section, what do I use to join the two flare nut fittings that will be on both ends, since the unions are not recommended?
When i get home today ill try to remeber to ask my dad. cuz hes the one that helped me with doing my lines...
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