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Wrench size for rear brake line extension

TXJP

TXJP

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Finally finishing up the 3" ORD lift and need to add my brake line extensions for the rear. What size wrench do I need for the hard lines that are coming from each brake that go into the extension at the differential? 3/8 and 10mm is too small, 7/16 and 11mm are too big. Is it a 13/32 or 10.5??
I am using just standard Craftsman wrenches. Do line wrenches fit a little different?
Thanks for the help guys. Hoping to wrap this think up this weekend so I can see how the new springs ride!
 
I found craftsman tubing wrenches aren't that great. I had trouble with my front brake lines and I was starting to get discouraged. I went and bought a set of SK tubing wrenches and it was night and day difference. You're probably having trouble finding the right size because the wrenches are too sloppy.

I'm pretty sure my 89 used all SAE sizes.
 
I forget the size, but it sounds like a set of wrenches that I have. They’re some off brand that my dad had and fit very tightly, like hammer it on tight. Took a micrometer to them and sure enough they were off. Guess they shrunk due to old age. :whistle:
 
Hmm, so maybe just bad wrenches. Maybe I should just invest in a set of SK line wrenches. Does anyone know what size I would need for that line? I assume it is not metric since everything else has been SAE.
 
TXJP said:
Hmm, so maybe just bad wrenches. Maybe I should just invest in a set of SK line wrenches. Does anyone know what size I would need for that line? I assume it is not metric since everything else has been SAE.
Click to expand...
Try different open end wrenches and see which fits. Of course don’t use them. :waytogo:
 
Most brake lines use standard sized nut fittings,at least on ones that are not metric...3/16" tube nuts are normally 3/8" hex,and 1/4" are 7/16"...however GM is famous for having "weird" sizes,like a 1/4" tubing with a nut that had 9/16" threads,those took a bigger wrench like a 5/8" ..

I hate cheap flare wrenches !--the ones that open up like they are made of springy steel,and round off the line nuts suck...

I've tossed away a set of "Buffalo" flare wrenches because of that,and a few Pittsburg brand ones from Harbor Freight snapped like glass instead.. --I bought the most common sizes in Craftsman brand at a flea market--"old" ones that were made well back decades ago,not their newer ones..so far those have worked OK for me..but if I see any used Snap-On or other "tool truck" flare wrenches for cheap money I'll buy them...

Often Vise-Grips or a small pipe wrench is the only thing that will loosen a rusted brake line nut up here...If I'm replacing a brake line I just snip off the tube close to the fitting and use a 6 point socket to get it out--otherwise you'll waste time after you succeed in rounding off the nut with a wrench..
 
I just bought a set of (3) wrenches that cover 6 sizes from 3/8"-11/16" and I have pretty much needed every size over the past few years.
 
I think I will just bite the bullet and get a set of SK line wrenches, figure that would be a good investment anyway. Thanks for the help fellas!
 
S-K was a good brand ,the parts stores I worked at sold them--however about 10 or so years ago,they went chapter 11 and would no longer honor their lifetime warranty unless you had a sales recepit for the purchase...I have quite a few S-K sockets and a few wrenches,but I would not bother seeking out any more of their tools for that reason..

I like Lowes "Kobalt" tool brand,they seem to hold up well and there is no hassles as far as the warranty if you ever had a problem with one of their tools..
 
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