What am I doing wrong?- brake line - The 1947 - Present Chevrolet & GMC Truck Message Board Network

70c10 · 04-25-2008, 02:34 AM

I have installed 2 different brake lines in the last week on the passenger side of the rear axle and both have leaked at the junction block where they split to each rear wheel

This should be a 5 minute job but I can't get the short line to stop leaking at the junction block! I looked in there and all the threads look good. How can I fix this?

**Palf70Step** · 04-25-2008, 02:39 AM

What does the flaring seat and flare look like. I had one that had a small nick in the T-block fitting and would leak no matter what I did to it until I replaced it.

tcb-1 · 04-25-2008, 02:40 AM

I know that some people use a petroleum resistant teflon tape, but make sure you get none on the tube mating surfaces.....

now for me, I had the same issue when I plumbed up 15 or so new lines. my MAJOR problem was that I was not torqueing the nuts down enough. I forgot the in/ft lb of torque they take, but after I went back through and tightened them down, I have'nt had another leak. remember, your trying to get metal to seal against metal, so the torque to do so will be more than you may think!

and double check your 45 degree double flares and make sure they are true and absolutely clean.

**Classic Heartbeat** · 04-25-2008, 02:41 AM

The brake line itself is not seating to the junction block. You may have a bad line or block. Also if you have stainless steel lines they are harder to get to seat than the steel ones. The fittings are not self seating pipe threads, so the threads can look just fine and the line will still leak. WES

70c10 · 04-25-2008, 02:44 AM

The first line I thought maybe I tightened it too much and crushed the flare but when I took it off tonight it looked good. I figured just to be safe I installed another new line and this one leaks also. I've never had to use teflon on brake line threads. I'm going to try removing it one more time to take another look but this is getting frustrating now. Thanks for the input so far!

70c10 · 04-25-2008, 02:46 AM

Quote:

Originally Posted by Classic Heartbeat

The brake line itself is not seating to the junction block. You may have a bad line or block. Also if you have stainless steel lines they are harder to get to seat than the steel ones. The fittings are not self seating pipe threads, so the threads can look just fine and the line will still leak. WES

WES, this is steel line. I don't think the block is bad. It's never leaked.

68 short step · 04-25-2008, 02:46 AM

replace the t-block....sounds like there is a burr in there (like 70step said)

70c10 · 04-25-2008, 02:47 AM

Where can I get a new block?

68 short step · 04-25-2008, 02:48 AM

the threads isnt the sealing part, its the flare.....and id say its either the lines or the block, but with 2 diffrent lines odds are its the block......

Old Money · 04-25-2008, 02:49 AM

do you have long threads on the end that leaks .i found you dont get enuff torque. the brass fitting is a little too long . if thats not it i woud still replace the fitting and start over. i am from wi. and we always do it twice. murphys law. if it jams force it, if it breaks its defective. Old Money.

68 short step · 04-25-2008, 02:50 AM

i would think a 1/8" NPT female, flared, T-block could be bought at ACE, LOWES, HOME DEPOT, ETC...

68 short step · 04-25-2008, 02:52 AM

Quote:

Originally Posted by Old Money

. i am from wi. and we always do it twice. murphys law. if it jams force it, if it breaks its defective. Old Money.

70c10 · 04-25-2008, 02:53 AM

Does anybody know where to get a new junction block???

**Classic Heartbeat** · 04-25-2008, 02:56 AM

We have them in stock. They are $19.95 plus shipping. They are not readily availible at your local hardware store. They have two different sized threads. WES

**Classic Heartbeat** · 04-25-2008, 02:57 AM

The local parts stores will tell you that they have been discontinued also. I searched for a long time to locate these. WES

70c10 · 04-25-2008, 02:58 AM

Thanks for the info WES- I'm going to check the line again but I may be calling you to order one soon.

**Classic Heartbeat** · 04-25-2008, 03:00 AM

Sounds good, I have 4 or 5 in stock. WES

70c10 · 04-25-2008, 03:46 AM

Quote:

Originally Posted by Classic Heartbeat

They have two different sized threads. WES

WES- the lines that I bought going to each wheel cylinder are 3/16". The fittings on these lines take a 3/8" wrench.

**Classic Heartbeat** · 04-25-2008, 03:53 AM

If you take the lines loose, you will see that the rubber line that goes into the block is larger than the two that go to the wheel cylinders. WES

70c10 · 04-25-2008, 05:11 AM

Quote:

Originally Posted by Classic Heartbeat

If you take the lines loose, you will see that the rubber line that goes into the block is larger than the two that go to the wheel cylinders. WES

Yes, I saw that. I noticed there is a U clip holding the block but how is the rubber line attached to the block???

70GMCer · 04-25-2008, 02:11 PM

Jim, you might want to leave that hose and block alone right now. If you try a loosen a 40 year old hose, you might be opening another can of worms. Relax.....we'll get it......I'm free on Saturday....

70c10 · 04-25-2008, 02:18 PM

Thanks Steve! I should have had this fixed in 5 minutes but you know how that goes!

haysonj · 04-25-2008, 04:09 PM

Brake lines are inverted flare I go to a hydraulic hose shop here to get my fittings, they also can make the rubber hoses that go to the wheels. I would suspect the junction block has a nick in it.

Premium72 · 04-25-2008, 04:43 PM

you can get a new block any where they sell brakelines for the most part. i would replace it. like you im on a tight budget with the truck.but. this is stuff thats just a few bucks. get a new line new blcok, double check your flares and chill out. dont get mad at your truck gor god sake , its OLD and cenial. just be patient with the old bat and youll make it!

*Shane* · 04-25-2008, 05:00 PM

Order the junction T from Wes. He KNOWS what he is talking about.

04-25-2008, 02:34 AM	#1
70c10 67-72 Addict! Join Date: Feb 2002 Location: The TAX State! Posts: 7,856	What am I doing wrong?- brake line I have installed 2 different brake lines in the last week on the passenger side of the rear axle and both have leaked at the junction block where they split to each rear wheel This should be a 5 minute job but I can't get the short line to stop leaking at the junction block! I looked in there and all the threads look good. How can I fix this? __________________ Jim 1970 C/10 Fleetside w/Ghost Flames Lowered 4.5" front and 4" rear (Raked) 355/350 Turbo w/shift kit 10" Redneck Performance Verter w/2500 stall Hooker Super Comps part#2808-1 Performer RPM Air-Gap 12 Bolt w/3:73 gears- Eaton Posi Comp Cams XE262 with 1.6 Crane Energizers, Road Demon 625 and Brodix IK 180 heads

04-25-2008, 02:39 AM	#2
Palf70Step State of Confusion! Join Date: Jul 2002 Location: Gulfport, MS USA Posts: 47,216	Re: What am I doing wrong?- brake line What does the flaring seat and flare look like. I had one that had a small nick in the T-block fitting and would leak no matter what I did to it until I replaced it. __________________ Bill 1970 Chevy Custom/10 LWB Fleetside 2010 Toyota Tacoma PreRunner SR5 Double Cab - DD Member of Louisiana Classic Truck Club (LCTC) Bill's Gallery Life isn't tied with a bow, but it's still a gift. Live simply. Love generously. Care deeply. Speak kindly. Leave the rest to God!

04-25-2008, 02:40 AM	#3
tcb-1 Nothing to see here..... Join Date: Jun 2007 Location: Shawnee, KS Posts: 4,625	Re: What am I doing wrong?- brake line I know that some people use a petroleum resistant teflon tape, but make sure you get none on the tube mating surfaces..... now for me, I had the same issue when I plumbed up 15 or so new lines. my MAJOR problem was that I was not torqueing the nuts down enough. I forgot the in/ft lb of torque they take, but after I went back through and tightened them down, I have'nt had another leak. remember, your trying to get metal to seal against metal, so the torque to do so will be more than you may think! and double check your 45 degree double flares and make sure they are true and absolutely clean. __________________ Doug THANK YOU to our American Soldiers & Veterans - POW MIA "You will NEVER be forgotten". The democracy will cease to exist when you take away from those who are willing to work and give to those who would not. Thomas Jefferson

04-25-2008, 02:41 AM	#4
Classic Heartbeat Project Junkie! Fishing Poor!! Join Date: Dec 1999 Location: Olympia,Wa. 98512 Posts: 10,766	Re: What am I doing wrong?- brake line The brake line itself is not seating to the junction block. You may have a bad line or block. Also if you have stainless steel lines they are harder to get to seat than the steel ones. The fittings are not self seating pipe threads, so the threads can look just fine and the line will still leak. WES __________________ On-line catolog Classic Heartbeat Pickup Parts WEHEPP@comcast.net Call us Toll Free (888) 338-2502 Like Us on Facebook No appointment necessary. 72 BB Chevy Custom Deluxe / Custom Camper 67 I-6 (Soon to be 5.7 LS1) Panel 68 BB Chevy Short Bed 72 6.0 LQ9 Short Bed Chevy 4X4 Olympia's fastest growing truck parts supplier. Olympia's home for Wayward Chevys

04-25-2008, 02:44 AM	#5
70c10 67-72 Addict! Join Date: Feb 2002 Location: The TAX State! Posts: 7,856	Re: What am I doing wrong?- brake line The first line I thought maybe I tightened it too much and crushed the flare but when I took it off tonight it looked good. I figured just to be safe I installed another new line and this one leaks also. I've never had to use teflon on brake line threads. I'm going to try removing it one more time to take another look but this is getting frustrating now. Thanks for the input so far! __________________ Jim 1970 C/10 Fleetside w/Ghost Flames Lowered 4.5" front and 4" rear (Raked) 355/350 Turbo w/shift kit 10" Redneck Performance Verter w/2500 stall Hooker Super Comps part#2808-1 Performer RPM Air-Gap 12 Bolt w/3:73 gears- Eaton Posi Comp Cams XE262 with 1.6 Crane Energizers, Road Demon 625 and Brodix IK 180 heads

04-25-2008, 02:46 AM	#7
68 short step Senior Member Join Date: Aug 2005 Location: tulsa OK Posts: 3,070	Re: What am I doing wrong?- brake line replace the t-block....sounds like there is a burr in there (like 70step said)

04-25-2008, 02:47 AM	#8
70c10 67-72 Addict! Join Date: Feb 2002 Location: The TAX State! Posts: 7,856	Re: What am I doing wrong?- brake line Where can I get a new block? __________________ Jim 1970 C/10 Fleetside w/Ghost Flames Lowered 4.5" front and 4" rear (Raked) 355/350 Turbo w/shift kit 10" Redneck Performance Verter w/2500 stall Hooker Super Comps part#2808-1 Performer RPM Air-Gap 12 Bolt w/3:73 gears- Eaton Posi Comp Cams XE262 with 1.6 Crane Energizers, Road Demon 625 and Brodix IK 180 heads

04-25-2008, 02:48 AM	#9
68 short step Senior Member Join Date: Aug 2005 Location: tulsa OK Posts: 3,070	Re: What am I doing wrong?- brake line the threads isnt the sealing part, its the flare.....and id say its either the lines or the block, but with 2 diffrent lines odds are its the block......

04-25-2008, 02:49 AM	#10
Old Money Registered User Join Date: Apr 2008 Location: Milton wi. 53563 Posts: 128	Re: What am I doing wrong?- brake line do you have long threads on the end that leaks .i found you dont get enuff torque. the brass fitting is a little too long . if thats not it i woud still replace the fitting and start over. i am from wi. and we always do it twice. murphys law. if it jams force it, if it breaks its defective. Old Money.

04-25-2008, 02:50 AM	#11
68 short step Senior Member Join Date: Aug 2005 Location: tulsa OK Posts: 3,070	Re: What am I doing wrong?- brake line i would think a 1/8" NPT female, flared, T-block could be bought at ACE, LOWES, HOME DEPOT, ETC...

04-25-2008, 02:53 AM	#13
70c10 67-72 Addict! Join Date: Feb 2002 Location: The TAX State! Posts: 7,856	Re: What am I doing wrong?- brake line Does anybody know where to get a new junction block??? __________________ Jim 1970 C/10 Fleetside w/Ghost Flames Lowered 4.5" front and 4" rear (Raked) 355/350 Turbo w/shift kit 10" Redneck Performance Verter w/2500 stall Hooker Super Comps part#2808-1 Performer RPM Air-Gap 12 Bolt w/3:73 gears- Eaton Posi Comp Cams XE262 with 1.6 Crane Energizers, Road Demon 625 and Brodix IK 180 heads

04-25-2008, 02:56 AM	#14
Classic Heartbeat Project Junkie! Fishing Poor!! Join Date: Dec 1999 Location: Olympia,Wa. 98512 Posts: 10,766	Re: What am I doing wrong?- brake line We have them in stock. They are $19.95 plus shipping. They are not readily availible at your local hardware store. They have two different sized threads. WES __________________ On-line catolog Classic Heartbeat Pickup Parts WEHEPP@comcast.net Call us Toll Free (888) 338-2502 Like Us on Facebook No appointment necessary. 72 BB Chevy Custom Deluxe / Custom Camper 67 I-6 (Soon to be 5.7 LS1) Panel 68 BB Chevy Short Bed 72 6.0 LQ9 Short Bed Chevy 4X4 Olympia's fastest growing truck parts supplier. Olympia's home for Wayward Chevys Last edited by Classic Heartbeat; 04-25-2008 at 02:58 AM.

04-25-2008, 02:57 AM	#15
Classic Heartbeat Project Junkie! Fishing Poor!! Join Date: Dec 1999 Location: Olympia,Wa. 98512 Posts: 10,766	Re: What am I doing wrong?- brake line The local parts stores will tell you that they have been discontinued also. I searched for a long time to locate these. WES __________________ On-line catolog Classic Heartbeat Pickup Parts WEHEPP@comcast.net Call us Toll Free (888) 338-2502 Like Us on Facebook No appointment necessary. 72 BB Chevy Custom Deluxe / Custom Camper 67 I-6 (Soon to be 5.7 LS1) Panel 68 BB Chevy Short Bed 72 6.0 LQ9 Short Bed Chevy 4X4 Olympia's fastest growing truck parts supplier. Olympia's home for Wayward Chevys Last edited by Classic Heartbeat; 04-25-2008 at 02:57 AM.

04-25-2008, 02:58 AM	#16
70c10 67-72 Addict! Join Date: Feb 2002 Location: The TAX State! Posts: 7,856	Re: What am I doing wrong?- brake line Thanks for the info WES- I'm going to check the line again but I may be calling you to order one soon. __________________ Jim 1970 C/10 Fleetside w/Ghost Flames Lowered 4.5" front and 4" rear (Raked) 355/350 Turbo w/shift kit 10" Redneck Performance Verter w/2500 stall Hooker Super Comps part#2808-1 Performer RPM Air-Gap 12 Bolt w/3:73 gears- Eaton Posi Comp Cams XE262 with 1.6 Crane Energizers, Road Demon 625 and Brodix IK 180 heads

04-25-2008, 03:00 AM	#17
Classic Heartbeat Project Junkie! Fishing Poor!! Join Date: Dec 1999 Location: Olympia,Wa. 98512 Posts: 10,766	Re: What am I doing wrong?- brake line Sounds good, I have 4 or 5 in stock. WES __________________ On-line catolog Classic Heartbeat Pickup Parts WEHEPP@comcast.net Call us Toll Free (888) 338-2502 Like Us on Facebook No appointment necessary. 72 BB Chevy Custom Deluxe / Custom Camper 67 I-6 (Soon to be 5.7 LS1) Panel 68 BB Chevy Short Bed 72 6.0 LQ9 Short Bed Chevy 4X4 Olympia's fastest growing truck parts supplier. Olympia's home for Wayward Chevys



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04-25-2008, 03:53 AM	#19
Classic Heartbeat Project Junkie! Fishing Poor!! Join Date: Dec 1999 Location: Olympia,Wa. 98512 Posts: 10,766	Re: What am I doing wrong?- brake line If you take the lines loose, you will see that the rubber line that goes into the block is larger than the two that go to the wheel cylinders. WES __________________ On-line catolog Classic Heartbeat Pickup Parts WEHEPP@comcast.net Call us Toll Free (888) 338-2502 Like Us on Facebook No appointment necessary. 72 BB Chevy Custom Deluxe / Custom Camper 67 I-6 (Soon to be 5.7 LS1) Panel 68 BB Chevy Short Bed 72 6.0 LQ9 Short Bed Chevy 4X4 Olympia's fastest growing truck parts supplier. Olympia's home for Wayward Chevys

04-25-2008, 02:11 PM	#21
70GMCer Senior Member Join Date: Apr 2005 Location: Joppa, Maryland Posts: 4,408	Re: What am I doing wrong?- brake line Jim, you might want to leave that hose and block alone right now. If you try a loosen a 40 year old hose, you might be opening another can of worms. Relax.....we'll get it......I'm free on Saturday.... __________________ 1997 GMC Sierra Ext 1965 Mustang

04-25-2008, 02:18 PM	#22
70c10 67-72 Addict! Join Date: Feb 2002 Location: The TAX State! Posts: 7,856	Re: What am I doing wrong?- brake line Thanks Steve! I should have had this fixed in 5 minutes but you know how that goes! __________________ Jim 1970 C/10 Fleetside w/Ghost Flames Lowered 4.5" front and 4" rear (Raked) 355/350 Turbo w/shift kit 10" Redneck Performance Verter w/2500 stall Hooker Super Comps part#2808-1 Performer RPM Air-Gap 12 Bolt w/3:73 gears- Eaton Posi Comp Cams XE262 with 1.6 Crane Energizers, Road Demon 625 and Brodix IK 180 heads

04-25-2008, 04:09 PM	#23
haysonj Registered User Join Date: Dec 2007 Location: Santa Maria, Ca. Posts: 1,423	Re: What am I doing wrong?- brake line Brake lines are inverted flare I go to a hydraulic hose shop here to get my fittings, they also can make the rubber hoses that go to the wheels. I would suspect the junction block has a nick in it. __________________ 69 Chevy 4x4 383 Power

04-25-2008, 04:43 PM	#24
Premium72 Registered User Join Date: Sep 2005 Location: Villa Rica Ga Posts: 889	Re: What am I doing wrong?- brake line you can get a new block any where they sell brakelines for the most part. i would replace it. like you im on a tight budget with the truck.but. this is stuff thats just a few bucks. get a new line new blcok, double check your flares and chill out. dont get mad at your truck gor god sake , its OLD and cenial. just be patient with the old bat and youll make it! __________________ WombatFire, Art-Design-MADNESS Follow My Build and Adventures on Instagram

04-25-2008, 05:00 PM	#25
Shane Account Suspended Join Date: Jun 2000 Location: over yonder Posts: 14,270	Re: What am I doing wrong?- brake line Order the junction T from Wes. He KNOWS what he is talking about.

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