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Compression fitting to splice brake line? #3080635
09/25/22 07:48 PM
09/25/22 07:48 PM
Joined: Jan 2003
Posts: 7,485
Albany, NY
67SATisfaction Offline OP
The member whose name is actually Art
67SATisfaction  Offline OP
The member whose name is actually Art

Joined: Jan 2003
Posts: 7,485
Albany, NY
Would you guys trust a compression fitting if you needed to splice any of your brake lines?
Thanks,
- Art


1965 Satellite hardtop 361/2bbl, console 727, open 2.76
1967 Satellite convert 383/4bbl, column 727, open 3.23
1967 Lancia Fulvia Sport 1.3 Zagato. FWD 1.3L V4 DOHC, 4-spd man.
1975 Maserati Bora, US spec 4.9L DOHC hemi V8, 5-spd ZF man
1977 Maserati Khamsin, Euro spec 4.9L DOHC hemi V8, 5-spd ZF man
1982 Alfa Romeo GTV6, 2.5L SOHC hemi V6, 5-spd man transaxle
2007 Aston Martin DB9, 6.0L DOHC V12, 6spd man transaxle
Re: Compression fitting to splice brake line? [Re: 67SATisfaction] #3080643
09/25/22 08:08 PM
09/25/22 08:08 PM
Joined: Jan 2003
Posts: 13,191
Omaha Ne
T
TJP Offline
I Live Here
TJP  Offline
I Live Here
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Joined: Jan 2003
Posts: 13,191
Omaha Ne
Originally Posted by 67SATisfaction
Would you guys trust a compression fitting if you needed to splice any of your brake lines?
Thanks,
- Art

I have heard there are some that will take the pressure but you're not going to find them at the local hardware store. Just an FYI: hydraulic pressures in a brake system can exceed 2500 PSI. Myself, to answer your question NO tsk
beer

Re: Compression fitting to splice brake line? [Re: TJP] #3080647
09/25/22 08:18 PM
09/25/22 08:18 PM
Joined: Dec 2004
Posts: 10,390
Rittman Ohio
fourgearsavoy Offline
I Live Here
fourgearsavoy  Offline
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Joined: Dec 2004
Posts: 10,390
Rittman Ohio
Could you do it ? sure I've done it myself before BUT that was when I was a young newlywed with a baby to feed and I was broke. Now I wouldn't do it though twocents

Gus beer


64 Plymouth Savoy
493 Indy EZ's by Nick at Compu-Flow
5-Speed Richmond faceplate Liberty box
Dana 60
Re: Compression fitting to splice brake line? [Re: 67SATisfaction] #3080666
09/25/22 08:59 PM
09/25/22 08:59 PM
Joined: Dec 2009
Posts: 18,774
in a cattle trailer down by th...
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Guitar Jones Offline
Paddle faster! I hear banjo music!
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in a cattle trailer down by th...
Originally Posted by 67SATisfaction
Would you guys trust a compression fitting if you needed to splice any of your brake lines?
Thanks,
- Art

Mmm, no.


I raise chickens, so I am literally a chicken tender.

The Scamp is sold, now just two old trucks and one newer one.
'92 D250 Club Cab CTD, 47RH conversion, pump tweaks, injectors, rear disc and hydroboost conversion.
'74 W200 Crew Cab 360, NV4500, D44, D60 and NP205 divorced transfer case.
2019 1500 Long Horn Crew Cab 4WD, 5.7 Hemi.
Re: Compression fitting to splice brake line? [Re: Guitar Jones] #3080669
09/25/22 09:11 PM
09/25/22 09:11 PM
Joined: Oct 2005
Posts: 8,273
Ontario, Canada
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Stanton Offline
Don't question me!
Stanton  Offline
Don't question me!
S

Joined: Oct 2005
Posts: 8,273
Ontario, Canada
I have done it but am much older and wiser now !!

Re: Compression fitting to splice brake line? [Re: Stanton] #3080672
09/25/22 09:20 PM
09/25/22 09:20 PM
Joined: Jan 2005
Posts: 8,340
Crook County, ILL
Mastershake340 Offline
master
Mastershake340  Offline
master

Joined: Jan 2005
Posts: 8,340
Crook County, ILL
Don’t.

Re: Compression fitting to splice brake line? [Re: Stanton] #3080673
09/25/22 09:21 PM
09/25/22 09:21 PM
Joined: Jan 2003
Posts: 7,485
Albany, NY
67SATisfaction Offline OP
The member whose name is actually Art
67SATisfaction  Offline OP
The member whose name is actually Art

Joined: Jan 2003
Posts: 7,485
Albany, NY
Thanks guys, thumbs
I will never trust that shop owner again. A reputable guy too, in the vintage/exotic restoration business in the Northwest. Sold me a car recently, I bought it sight unseen, with plenty of emailed photos, but I was also relying heavily on his reputation.

The car failed its state inspection, and the compression fitting was one of several fails - the mechanic explained the same thing about pressure capacity. I think he said compression fittings are rated to 850psi, but brake systems are upwards of 2500. Thank you for letting me just double check whether anyone else used them as a common fix.

The other Fails were due to lack of cotter pins at all steering linkage castle nuts, and worn out tie-rod ends.
None of these issues are difficult or complicated, but that just amplifies the guy's sloppy work and poor service mindedness.

Live and learn,
- Art

Last edited by 67SATisfaction; 09/25/22 09:23 PM.

1965 Satellite hardtop 361/2bbl, console 727, open 2.76
1967 Satellite convert 383/4bbl, column 727, open 3.23
1967 Lancia Fulvia Sport 1.3 Zagato. FWD 1.3L V4 DOHC, 4-spd man.
1975 Maserati Bora, US spec 4.9L DOHC hemi V8, 5-spd ZF man
1977 Maserati Khamsin, Euro spec 4.9L DOHC hemi V8, 5-spd ZF man
1982 Alfa Romeo GTV6, 2.5L SOHC hemi V6, 5-spd man transaxle
2007 Aston Martin DB9, 6.0L DOHC V12, 6spd man transaxle
Re: Compression fitting to splice brake line? [Re: 67SATisfaction] #3080674
09/25/22 09:22 PM
09/25/22 09:22 PM
Joined: May 2006
Posts: 1,356
Phila
P
PhillyRag Offline
pro stock
PhillyRag  Offline
pro stock
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Joined: May 2006
Posts: 1,356
Phila
Why go that apparently easy route, when a nice flare fitting would do fine?

Re: Compression fitting to splice brake line? [Re: PhillyRag] #3080675
09/25/22 09:25 PM
09/25/22 09:25 PM
Joined: Jan 2003
Posts: 7,485
Albany, NY
67SATisfaction Offline OP
The member whose name is actually Art
67SATisfaction  Offline OP
The member whose name is actually Art

Joined: Jan 2003
Posts: 7,485
Albany, NY
Originally Posted by PhillyRag
Why go that apparently easy route, when a nice flare fitting would do fine?


Exactly - I'm good at this kind of work, it'll take me maybe an hour to fix it, then refill and bleed the system.. So why didn't he do it right the first time? What a crap work ethic - not to mention liability.



Last edited by 67SATisfaction; 09/25/22 09:25 PM.

1965 Satellite hardtop 361/2bbl, console 727, open 2.76
1967 Satellite convert 383/4bbl, column 727, open 3.23
1967 Lancia Fulvia Sport 1.3 Zagato. FWD 1.3L V4 DOHC, 4-spd man.
1975 Maserati Bora, US spec 4.9L DOHC hemi V8, 5-spd ZF man
1977 Maserati Khamsin, Euro spec 4.9L DOHC hemi V8, 5-spd ZF man
1982 Alfa Romeo GTV6, 2.5L SOHC hemi V6, 5-spd man transaxle
2007 Aston Martin DB9, 6.0L DOHC V12, 6spd man transaxle
Re: Compression fitting to splice brake line? [Re: 67SATisfaction] #3080694
09/25/22 10:36 PM
09/25/22 10:36 PM
Joined: Dec 2018
Posts: 67
IL
8
83hurstguy Offline
member
83hurstguy  Offline
member
8

Joined: Dec 2018
Posts: 67
IL
If it’s a swagelok, parker, or yor-lok fitting, it’s likely fine pending proper install. Cheap hardware store brass compression fittings won’t cut it. The good ones are rated for high pressure.

https://www.mcmaster.com/yor-lok-fittings/yor-lok-fittings-for-steel-tubing-7/

Re: Compression fitting to splice brake line? [Re: 67SATisfaction] #3080710
09/26/22 12:35 AM
09/26/22 12:35 AM
Joined: Aug 2003
Posts: 40,399
Bend,OR USA
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Cab_Burge Offline
I Win
Cab_Burge  Offline
I Win
C

Joined: Aug 2003
Posts: 40,399
Bend,OR USA
Originally Posted by 67SATisfaction
Would you guys trust a compression fitting if you needed to splice any of your brake lines?
Thanks,
- Art
Never, do you want to kill yourself or someone you love or don't know?
Buy the proper tools and learn how to use them the correct way or buy the best premade lines you can get twocents scope wrench up


Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
Re: Compression fitting to splice brake line? [Re: 83hurstguy] #3080711
09/26/22 12:38 AM
09/26/22 12:38 AM
Joined: Dec 2005
Posts: 9,532
Fulton County, PA
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CMcAllister Offline
Mr. Helpful
CMcAllister  Offline
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Joined: Dec 2005
Posts: 9,532
Fulton County, PA
I will be honest. I see plenty of hilljacks, shade trees, guys too dumb to use a flaring tool and the "aww, I do it all the time, never had a problem" guys do it, even after being told not to.

The answer is no. Everytime.


If the results don't match the theory, change the theory.
Re: Compression fitting to splice brake line? [Re: 83hurstguy] #3080749
09/26/22 08:16 AM
09/26/22 08:16 AM
Joined: Jan 2003
Posts: 9,741
North Dakota
6PakBee Offline
master
6PakBee  Offline
master

Joined: Jan 2003
Posts: 9,741
North Dakota
Originally Posted by 83hurstguy
If it’s a swagelok, parker, or yor-lok fitting, it’s likely fine pending proper install. Cheap hardware store brass compression fittings won’t cut it. The good ones are rated for high pressure.

https://www.mcmaster.com/yor-lok-fittings/yor-lok-fittings-for-steel-tubing-7/


Absolutely true. I routinely worked with Parker CPI fittings for years in power plants at pressures up to 3500 psig. The problem is that most of these higher quality fittings are stainless steel rather than steel so you would have a materials compatibly issue.


"Only the best and brightest"
Re: Compression fitting to splice brake line? [Re: 67SATisfaction] #3080756
09/26/22 08:43 AM
09/26/22 08:43 AM
Joined: Jan 2003
Posts: 8,374
Benton, IL.
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DaveRS23 Offline
master
DaveRS23  Offline
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D

Joined: Jan 2003
Posts: 8,374
Benton, IL.
Compression fittings should not be used on brake lines. I agree.

But here's the reality: I have seen plenty of them used on brake lines for the better part of 45 years and don't remember seeing a single failure due to the fitting itself. Rusty or scaly lines where they cannot grip properly is a different matter. But I have not personally seen a fitting connection fail that wasn't compromised in some other way.

I have however, seen many double flare connections fail. Usually due to poor workmanship. They take practice and a good tool. Often both can be lacking.

Not an endorsement for using compression fittings on brake lines, just my experience.


KOS
Re: Compression fitting to splice brake line? [Re: DaveRS23] #3080769
09/26/22 09:20 AM
09/26/22 09:20 AM
Joined: Jan 2003
Posts: 3,892
Canada -- Posts: 4034 -Registe...
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5thAve Offline
Doesn't care what this says anyway
5thAve  Offline
Doesn't care what this says anyway
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Posts: 3,892
Canada -- Posts: 4034 -Registe...
Compression fittings on brake likes are a big inspection fail. With the rest of the issues that are pretty basic things it sounds like that's a pretty shady shop to allow that quality or work to go out.

Re: Compression fitting to splice brake line? [Re: 5thAve] #3080966
09/26/22 07:35 PM
09/26/22 07:35 PM
Joined: Jun 2006
Posts: 442
Central NY
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GarageDodge Offline
mopar
GarageDodge  Offline
mopar
G

Joined: Jun 2006
Posts: 442
Central NY
in nys compression fittings are a reason to fail inspection,they should not be used on a brake line.

Re: Compression fitting to splice brake line? [Re: 67SATisfaction] #3080989
09/26/22 08:21 PM
09/26/22 08:21 PM
Joined: Jan 2003
Posts: 13,191
Omaha Ne
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TJP Offline
I Live Here
TJP  Offline
I Live Here
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Joined: Jan 2003
Posts: 13,191
Omaha Ne
Originally Posted by 67SATisfaction
Thanks guys, thumbs
I will never trust that shop owner again. A reputable guy too, in the vintage/exotic restoration business in the Northwest. Sold me a car recently, I bought it sight unseen, with plenty of emailed photos, but I was also relying heavily on his reputation.

The car failed its state inspection, and the compression fitting was one of several fails - the mechanic explained the same thing about pressure capacity. I think he said compression fittings are rated to 850psi, but brake systems are upwards of 2500. Thank you for letting me just double check whether anyone else used them as a common fix.

The other Fails were due to lack of cotter pins at all steering linkage castle nuts, and worn out tie-rod ends.
None of these issues are difficult or complicated, but that just amplifies the guy's sloppy work and poor service mindedness.

Live and learn,
- Art


FWIW, I have seen all of the above and more on 200K BJ show ponies as well as others wink







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