Home » Public Forums » GMCnet » Leaking brake line.. ideas?
| Leaking brake line.. ideas? [message #187623] |
Thu, 18 October 2012 21:01  |
lqqkatjon
Messages: 2324
Registered: October 2010
Location: St. Cloud, MN
Karma: 5
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Ok... I replaced my brake valve early this year.
I noticed that I had a leak on one of the old brake lines going into the bottom of the valve.
so I replaced that line this week. Stupid thing still is leaking. Not as bad.. but I also have it alot tighter now.
only leaks when I press hard on the pedal, and very slightly.
how often does one get a bad brake line? any thoughts as to what I should do to make sure it does not leak if I try to put in another new one.
am I using the wrong flare? I think it is a double flare.
I was tempted to try a "flare saver" but not sure if I can even find one locally.
here is the picture of the one that is leaking.
http://www.gmcmhphotos.com/photos/member-galleries/p46163-brake-valve-leak.html
I really do not like working on this once. I really hate having to deal with something twice or three times.
plan is to pick up another line. bend it, and then just make sure I get a mirror and look closely to make sure the brass is not cracked, or something burred inside.
http://www.gmcmhphotos.com/photos/member-galleries/p46163-brake-valve-leak.html
Jon Roche
75 palm beach
EBL EFI, manny headers, Micro Level, rebuilt most of coach now.
St. Cloud, MN
http://lqqkatjon.blogspot.com/
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| Re: Leaking brake line.. ideas? [message #187627 is a reply to message #187623] |
Thu, 18 October 2012 22:12  |
Ken Burton
Messages: 10030
Registered: January 2004
Location: Hebron, Indiana
Karma: 10
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That sounds like a good plan to me. I have one like that on an oil cooler line. I have not been able to fix it for many years. I just clean it off at every oil change. There is a lot less pressure on an oil cooler line that there is on a brake line.
Ken Burton - N9KB
76 Palm Beach
Hebron, Indiana
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| Re: [GMCnet] Leaking brake line.. ideas? [message #187630 is a reply to message #187623] |
Thu, 18 October 2012 22:25 |
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USAussie
Messages: 15912
Registered: July 2007
Location: Sydney, Australia
Karma: 6
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Jon,
I replaced the steel brake lines in Double Trouble with SS. When I was done I had one leaking fitting on the proportioning valve,
can't remember which one. I tightened as far as I dared (being brass) and it still leaked. I was getting ready to return to
Australia and didn't have time to mess with it and put it on my TTD list for when I came back the next year.
When I came back the next year the leak was gone! The GMC elves must have come and fixed it while I was gone!
Actually I believe the flare angles between the line and he fittings were off a bit and leaving it tightened for eight months
re-shaped the flare.
Regards,
Rob
-----Original Message-----
From: gmclist-bounces@temp.gmcnet.org [mailto:gmclist-bounces@temp.gmcnet.org] On Behalf Of Jon Roche
Sent: Thursday, October 18, 2012 8:01 PM
To: gmclist@temp.gmcnet.org
Subject: [GMCnet] Leaking brake line.. ideas?
Ok... I replaced my brake valve early this year.
I noticed that I had a leak on one of the old brake lines going into the bottom of the valve.
so I replaced that line this week. Stupid thing still is leaking. Not as bad.. but I also have it alot tighter now.
only leaks when I press hard on the pedal, and very slightly.
how often does one get a bad brake line? any thoughts as to what I should do to make sure it does not leak if I try to put in
another new one.
am I using the wrong flare? I think it is a double flare.
I was tempted to try a "flare saver" but not sure if I can even find one locally.
here is the picture of the one that is leaking.
http://www.gmcmhphotos.com/photos/member-galleries/p46163-brake-valve-leak.html
I really do not like working on this once. I really hate having to deal with something twice or three times.
plan is to pick up another line. bend it, and then just make sure I get a mirror and look closely to make sure the brass is not
cracked, or something burred inside.
http://www.gmcmhphotos.com/photos/member-galleries/p46163-brake-valve-leak.html
--
75 palm beach
St. Cloud, MN
http://lqqkatjon.blogspot.com/
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Regards,
Rob M. (USAussie)
The Pedantic Mechanic
Sydney, Australia
'75 Avion - AUS - The Blue Streak TZE365V100428
'75 Avion - USA - Double Trouble TZE365V100426
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| Re: [GMCnet] Leaking brake line.. ideas? [message #187632 is a reply to message #187623] |
Thu, 18 October 2012 22:47 |
Ken Henderson
Messages: 8726
Registered: March 2004
Location: Americus, GA
Karma: 9
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Senior Member |
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Jon,
I'd loosen & tighten the flare nut a few times -- not necessarily REAL
tight. Then let it leak for a while if it wants too. It may eventually
stop as the steel displaces brass. Might help to occasionally back off a
flat or two and re-tighten it.
Worth a try. If it doesn't work, then put a copper washer in it like this
(don't try to make your own for brake line though):
http://www.gmcmhphotos.com/photos/g4452-flare-fitting-repair-with-copper-seal.html
or
http://goo.gl/h3zxb
JWID,
Ken H.
On Thu, Oct 18, 2012 at 10:01 PM, Jon Roche wrote:
>
>
> Ok... I replaced my brake valve early this year.
>
> I noticed that I had a leak on one of the old brake lines going into the
> bottom of the valve.
>
> so I replaced that line this week. Stupid thing still is leaking. Not as
> bad.. but I also have it alot tighter now.
>
> only leaks when I press hard on the pedal, and very slightly.
>
> how often does one get a bad brake line? any thoughts as to what I should
> do to make sure it does not leak if I try to put in another new one.
>
> am I using the wrong flare? I think it is a double flare.
>
> I was tempted to try a "flare saver" but not sure if I can even find one
> locally.
>
> here is the picture of the one that is leaking.
>
>
> http://www.gmcmhphotos.com/photos/member-galleries/p46163-brake-valve-leak.html
>
> I really do not like working on this once. I really hate having to deal
> with something twice or three times.
>
> plan is to pick up another line. bend it, and then just make sure I get a
> mirror and look closely to make sure the brass is not cracked, or something
> burred inside.
>
>
> http://www.gmcmhphotos.com/photos/member-galleries/p46163-brake-valve-leak.html
>
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Ken Henderson
Americus, GA
www.gmcwipersetc.com
Large Wiring Diagrams
76 X-Birchaven
76 X-Palm Beach
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| Re: [GMCnet] Leaking brake line.. ideas? [message #187633 is a reply to message #187631] |
Thu, 18 October 2012 22:52 |
Mr ERFisher
Messages: 7117
Registered: August 2005
Karma: 2
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Senior Member |
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or flare washers :>)
On Thu, Oct 18, 2012 at 8:42 PM, <mr.erfisher@gmail.com> wrote:
> Jimk sells copper flair washers for this problem
> Gene
>
> FREE WIFI @ Mickey D
>
>
>
>
>
> On Oct 18, 2012, at 7:01 PM, Jon Roche <lqqkatjon@gmail.com> wrote:
>
> >
> >
> > Ok... I replaced my brake valve early this year.
> >
> > I noticed that I had a leak on one of the old brake lines going into the
> bottom of the valve.
> >
> > so I replaced that line this week. Stupid thing still is leaking. Not
> as bad.. but I also have it alot tighter now.
> >
> > only leaks when I press hard on the pedal, and very slightly.
> >
> > how often does one get a bad brake line? any thoughts as to what I
> should do to make sure it does not leak if I try to put in another new one.
> >
> > am I using the wrong flare? I think it is a double flare.
> >
> > I was tempted to try a "flare saver" but not sure if I can even find
> one locally.
> >
> > here is the picture of the one that is leaking.
> >
> >
> http://www.gmcmhphotos.com/photos/member-galleries/p46163-brake-valve-leak.html
> >
> > I really do not like working on this once. I really hate having to deal
> with something twice or three times.
> >
> > plan is to pick up another line. bend it, and then just make sure I get
> a mirror and look closely to make sure the brass is not cracked, or
> something burred inside.
> >
> >
> http://www.gmcmhphotos.com/photos/member-galleries/p46163-brake-valve-leak.html
> >
> >
> >
> > --
> > 75 palm beach
> > St. Cloud, MN
> > http://lqqkatjon.blogspot.com/
> > _______________________________________________
> > GMCnet mailing list
> > Unsubscribe or Change List Options:
> > http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
>
--
Gene Fisher -- 74-23,77PB/ore/ca
“Give a man a fish; you have fed him for today --- give him a URL and
-------
http://gmcmotorhome.info/
Alternator Protection Cable
http://gmcmotorhome.info/APC.html
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| Re: Leaking brake line.. ideas? [message #187634 is a reply to message #187623] |
Thu, 18 October 2012 23:13 |
captjack
Messages: 271
Registered: February 2010
Location: Sebastopol, California
Karma: 1
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Senior Member |
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I've got exactly the same problem. I changed out my old proportioning valve for a new brass one -- bad idea as it turns out. I had a leak at the same spot. Tried tightening it, copper washer -- and still no joy. Finally JK agreed to replace the valve since I thought it was bad. Things were OK for a couple of months and now, it's leaking again. Bummer.
Jack Christensen - K6ROW,
'76 Glenbrook/Clasco - "The Silver Bullet",
Sebastopol, CA
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| Re: [GMCnet] Leaking brake line.. ideas? [message #187635 is a reply to message #187634] |
Thu, 18 October 2012 23:32 |
Ken Henderson
Messages: 8726
Registered: March 2004
Location: Americus, GA
Karma: 9
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Senior Member |
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I wonder if those brass combination valves have replaceable seats like many
master cylinders?
Ken H.
On Fri, Oct 19, 2012 at 12:13 AM, Jack Christensen wrote:
>
>
> I've got exactly the same problem. I changed out my old proportioning
> valve for a new brass one -- bad idea as it turns out. I had a leak at the
> same spot. Tried tightening it, copper washer -- and still no joy.
> Finally JK agreed to replace the valve since I thought it was bad. Things
> were OK for a couple of months and now, it's leaking again. Bummer.
> --
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Ken Henderson
Americus, GA
www.gmcwipersetc.com
Large Wiring Diagrams
76 X-Birchaven
76 X-Palm Beach
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| Re: [GMCnet] Leaking brake line.. ideas? [message #187659 is a reply to message #187631] |
Fri, 19 October 2012 10:56 |
roy1
Messages: 2126
Registered: July 2004
Location: Minden nevada
Karma: 6
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[quote title=Mr ERFisher wrote on Thu, 18 October 2012 20:42]Jimk sells copper flair washers for this problem
Gene
Does he have flair washers for an inverted flair? I have only seen flair washers for a standard flair fitting. If he does that would surely fix the leak if the brass block isn't cracked.
Roy Keen
Minden,NV
76 X Glenbrook
[Updated on: Fri, 19 October 2012 10:58] Report message to a moderator |
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| Re: [GMCnet] Leaking brake line.. ideas? [message #187661 is a reply to message #187630] |
Fri, 19 October 2012 11:58 |
Surbo
Messages: 213
Registered: February 2004
Karma: 0
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Senior Member |
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| Robert Mueller wrote on Thu, 18 October 2012 22:25 |
Jon,
I replaced the steel brake lines in Double Trouble with SS. When I was done I had one leaking fitting on the proportioning valve,
can't remember which one. I tightened as far as I dared (being brass) and it still leaked. I was getting ready to return to
Australia and didn't have time to mess with it and put it on my TTD list for when I came back the next year.
When I came back the next year the leak was gone! The GMC elves must have come and fixed it while I was gone!
Actually I believe the flare angles between the line and he fittings were off a bit and leaving it tightened for eight months
re-shaped the flare.
Regards,
Rob
-----Original Message-----
From: gmclist-bounces@temp.gmcnet.org [mailto:gmclist-bounces@temp.gmcnet.org] On Behalf Of Jon Roche
Sent: Thursday, October 18, 2012 8:01 PM
To: gmclist@temp.gmcnet.org
Subject: [GMCnet] Leaking brake line.. ideas?
Ok... I replaced my brake valve early this year.
I noticed that I had a leak on one of the old brake lines going into the bottom of the valve.
so I replaced that line this week. Stupid thing still is leaking. Not as bad.. but I also have it alot tighter now.
only leaks when I press hard on the pedal, and very slightly.
how often does one get a bad brake line? any thoughts as to what I should do to make sure it does not leak if I try to put in
another new one.
am I using the wrong flare? I think it is a double flare.
I was tempted to try a "flare saver" but not sure if I can even find one locally.
here is the picture of the one that is leaking.
http://www.gmcmhphotos.com/photos/member-galleries/p46163-brake-valve-leak.html
I really do not like working on this once. I really hate having to deal with something twice or three times.
plan is to pick up another line. bend it, and then just make sure I get a mirror and look closely to make sure the brass is not
cracked, or something burred inside.
http://www.gmcmhphotos.com/photos/member-galleries/p46163-brake-valve-leak.html
--
75 palm beach
St. Cloud, MN
http://lqqkatjon.blogspot.com/
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Fella's;
You need to check the angle of the flare to see if it is 45* or AN/JIC 37* or in some cases, it could be what they call a "dual flare" where it is a combination of both 37* and 45*.
Bob Drewes in SESD
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| Re: [GMCnet] Leaking brake line.. ideas? [message #187726 is a reply to message #187721] |
Fri, 19 October 2012 23:15 |
Ken Burton
Messages: 10030
Registered: January 2004
Location: Hebron, Indiana
Karma: 10
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Senior Member |
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I thought the same thing. I almost posted "Just turn the washer over and it will work inverted."
[quote title=emerystora wrote on Fri, 19 October 2012 22:24]I didn't think that washers used for flare fittings would be any different for inverted flare fittings.
Am I wrong?
Emery Stora
On Oct 19, 2012, at 9:56 AM, roy@gmcnet.org wrote:
>
>
> | Mr ERFisher wrote on Thu, 18 October 2012 20:42 |
Jimk sells copper flair washers for this problem
> Gene
>
> Does he have flair washers for an inverted flair? I have only seen flair washers for a standard flair fitting. If he does that would surly fix the leak if the brass block isn't cracked.
> --
> Roy Keen
> Minden,NV
> 76 X Glenbrook
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Ken Burton - N9KB
76 Palm Beach
Hebron, Indiana
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| Re: [GMCnet] Leaking brake line.. ideas? [message #187746 is a reply to message #187726] |
Sat, 20 October 2012 07:44 |
 |
Matt Colie
Messages: 8547
Registered: March 2007
Location: S.E. Michigan
Karma: 7
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| Ken Burton wrote on Sat, 20 October 2012 00:15 |
I thought the same thing. I almost posted "Just turn the washer over and it will work inverted."
| emerystora wrote on Fri, 19 October 2012 22:24 |
I didn't think that washers used for flare fittings would be any different for inverted flare fittings.
Am I wrong?
Emery Stora
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Ken and Emery,
You are both completely correct. The fully annealed copper washers will work on either SAE inverted flare or standard flare.
I have done this, but it is a bear to get that little ******* washer to stay where it is needed while you get the fitting set to tighten.
Hint: When screwing the line nut home, if it stops too soon, that little washer has fallen out of place and soon as you put any torque on the nut, the sideways washer will be crushed and useless.
These washers are easy enough to get if you can get to a real refrigeration parts supplier - not a place that sells refrigerators, a place that sells expansion valves and dryers. If you are nice they may just give you a couple. (Get at least two, if you only have one.....)
I probably have some out in my box of reefer parts.
Matt
Matt & Mary Colie - Chaumière -'73 Glacier 23 - Members GMCMI, GMCGL, GMCES
Electronically Controlled Quiet Engine Cooling Fan with OE Rear Drum Brakes with Applied Control Arms
SE Michigan - Near DTW - Twixt A2 and Detroit
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| Re: [GMCnet] Leaking brake line.. ideas? [message #187780 is a reply to message #187721] |
Sat, 20 October 2012 15:20 |
roy1
Messages: 2126
Registered: July 2004
Location: Minden nevada
Karma: 6
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Senior Member |
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Never tried them on an inverted flair as I just figured the std ones were a little larger in diameter. I see others have fit them in the inverted flair so I'll keep that in mind . They are nice to have on hand when you have a slow leak that just needs a soft copper gasket.
Roy Keen
Minden,NV
76 X Glenbrook
[Updated on: Sat, 20 October 2012 20:43] Report message to a moderator |
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