T Fitting For Hydraulic Brake Controller ? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

54blackhornet · 09-19-2021, 02:45 PM

I have this brass fitting plumed into the front port on my master cylinder. The line exiting goes to a trail brake controller. If I unscrew the line and plug it quickly will I have to bleed the entire system ? The controller itself is starting to leak inside the cab...thanks

54blackhornet · 09-19-2021, 02:46 PM

Sorry that the photo is sideways.

CastIron · 09-19-2021, 02:53 PM

There's one way to find out- try it. You could try bleeding it right at the fitting. Just loosen the nut while somebody pushed the pedal. I've replaced master cylinders doing that and been successful.

**HO455** · 09-19-2021, 02:58 PM

You won't have to bleed both circuits just the one that the controller is plumbed into. As a short term fix you could crimp the line to the controller to stop or slow the leak.

Wrenchbender Ret · 09-19-2021, 03:08 PM

That is a flare fitting. You need a blank fitting to plug it with. The best way to get one isto take a fitting & weld it shut. I believe it is a 5/16 tube fitting. Or you could cut the tube about 2 in. from the fitting & fold it over & squese it real tight. You won't need to bleed it if you do like you say "plug it Quickly". Gravity will bleed it but don't let the master cyl run dry.
George

54blackhornet · 09-19-2021, 04:48 PM

So the plug I got yesterday won’t seal it ?

54blackhornet · 09-19-2021, 05:08 PM

It appears to have the proper compression flair ?

**Joesjunk** · 09-19-2021, 05:46 PM

Take that “T” piece out and your original brake line should go right back into the master cylinder like factory. I have removed several of those and never had to bleed the brakes.

**Sheepdip** · 09-19-2021, 06:18 PM

Quote:

Originally Posted by Joesjunk

Take that “T” piece out and your original brake line should go right back into the master cylinder like factory. I have removed several of those and never had to bleed the brakes.

^^^^^^^^^^^^^^What he said^^^^^^^^^^^^^^^^^^^

That's what I did before I upgraded to disc brakes and changed the whole shebang out.

54blackhornet · 09-19-2021, 06:46 PM

Thanks ! I just thought I would loose to mu fluid trying to get the original line back into the master ? Doing that would also mean breaking the rear connection to allow movement of line and bending it. Plugging the hole in the T seems pretty easy in comparison ? Trying not to have to bleed the system if possible.

**pjmoreland** · 09-19-2021, 08:53 PM

If you top off the master cylinder and reinstall the lid tightly prior to disconnecting the line, the fluid won't run out very quickly. That's how it's been in my experience.

09-19-2021, 02:45 PM	#1
54blackhornet Registered User Join Date: Jul 2008 Location: Eastern Oregon Posts: 2,393	T Fitting For Hydraulic Brake Controller ? I have this brass fitting plumed into the front port on my master cylinder. The line exiting goes to a trail brake controller. If I unscrew the line and plug it quickly will I have to bleed the entire system ? The controller itself is starting to leak inside the cab...thanks Attached Images __________________ 71 C-20 07 Magnum RT AWD

09-19-2021, 02:46 PM	#2
54blackhornet Registered User Join Date: Jul 2008 Location: Eastern Oregon Posts: 2,393	Re: T Fitting For Hydraulic Brake Controller ? Sorry that the photo is sideways. __________________ 71 C-20 07 Magnum RT AWD

09-19-2021, 02:53 PM	#3
CastIron Registered User Join Date: May 2013 Location: Oregon Posts: 330	Re: T Fitting For Hydraulic Brake Controller ? There's one way to find out- try it. You could try bleeding it right at the fitting. Just loosen the nut while somebody pushed the pedal. I've replaced master cylinders doing that and been successful.

09-19-2021, 02:58 PM	#4
HO455 Post Whore Join Date: Feb 2016 Location: Portland Oregon Posts: 11,393	Re: T Fitting For Hydraulic Brake Controller ? You won't have to bleed both circuits just the one that the controller is plumbed into. As a short term fix you could crimp the line to the controller to stop or slow the leak. __________________ Thanks to Bob and Jeanie and everyone else at Superior Performance for all their great help. RIP Bob Parks. 1967 Burban (the WMB),1988 S10 Blazer (the Stink10 II),1969 GTO (the Goat), 1970 Javelin, 1952 F2 Ford OHC six 4X4, 29 Model A, 72 Firebird (the DBP Bird). 85 Alfa Romeo If it breaks I didn't want it in the first place The WMB repair thread http://67-72chevytrucks.com/vboard/s...d.php?t=698377

09-19-2021, 03:08 PM	#5
Wrenchbender Ret Registered User Join Date: Oct 2005 Location: Overland Park, Ks. Posts: 5,229	Re: T Fitting For Hydraulic Brake Controller ? That is a flare fitting. You need a blank fitting to plug it with. The best way to get one isto take a fitting & weld it shut. I believe it is a 5/16 tube fitting. Or you could cut the tube about 2 in. from the fitting & fold it over & squese it real tight. You won't need to bleed it if you do like you say "plug it Quickly". Gravity will bleed it but don't let the master cyl run dry. George

09-19-2021, 04:48 PM	#6
54blackhornet Registered User Join Date: Jul 2008 Location: Eastern Oregon Posts: 2,393	Re: T Fitting For Hydraulic Brake Controller ? So the plug I got yesterday won’t seal it ? __________________ 71 C-20 07 Magnum RT AWD

09-19-2021, 05:08 PM	#7
54blackhornet Registered User Join Date: Jul 2008 Location: Eastern Oregon Posts: 2,393	Re: T Fitting For Hydraulic Brake Controller ? It appears to have the proper compression flair ? Attached Images __________________ 71 C-20 07 Magnum RT AWD

09-19-2021, 05:46 PM	#8
Joesjunk Senior Member Join Date: May 2001 Location: Independence MO. Posts: 7,709	Re: T Fitting For Hydraulic Brake Controller ? Take that “T” piece out and your original brake line should go right back into the master cylinder like factory. I have removed several of those and never had to bleed the brakes. __________________ 72 3/4t Custom Deluxe 402/auto 66k Original paint 71 3/4t 4x4 Custom Deluxe 10k original miles Original paint 71 3/4t Cheyenne 402 70k original paint 72 3/4t 4x4 Custom deluxe 72 3/4t 4x4 Custom deluxe 91k original paint 72 Cheyenne/30 Dually 69 Camaro SS396 4-speed 13 GMC 2500HD Duramax I bought new 05 Jeep Wrangler "Willys Edition" 12k miles (I bought new) 85 3/4 ton 4x4 Scottsdale 33k miles original paint 86 1 ton 4x4 SRW Silverado 454 restored 80 1 ton 4x4 SRW Silverado 9,434 original miles!! original paint 95 GMC 1 ton dually 4x4 my dad bought new 95 GMC 3/4 ton 4x4, regular cab 454, 31k original miles 2002 2500HD 4x4 regular cab 6.0L 67k miles 2002 2500HD 4x4 regular cab 8.1L 28k miles 2003 GMC 2500HD 4x4 regular cab Diesel 93k miles 67-72 Parts for sale

09-19-2021, 06:46 PM	#10
54blackhornet Registered User Join Date: Jul 2008 Location: Eastern Oregon Posts: 2,393	Re: T Fitting For Hydraulic Brake Controller ? Thanks ! I just thought I would loose to mu fluid trying to get the original line back into the master ? Doing that would also mean breaking the rear connection to allow movement of line and bending it. Plugging the hole in the T seems pretty easy in comparison ? Trying not to have to bleed the system if possible. __________________ 71 C-20 07 Magnum RT AWD Last edited by 54blackhornet; 09-19-2021 at 07:06 PM.

09-19-2021, 08:53 PM	#11
pjmoreland Senior Member Join Date: Jan 2005 Location: CA Posts: 6,011	Re: T Fitting For Hydraulic Brake Controller ? If you top off the master cylinder and reinstall the lid tightly prior to disconnecting the line, the fluid won't run out very quickly. That's how it's been in my experience.



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