Break booster install vacuum question - The 1947 - Present Chevrolet & GMC Truck Message Board Network

phlegm · 02-09-2020, 12:46 PM

Hey guys. I got the summit brake booster kit link here. I have some questions about connecting up be back in. Have a 71 C10 with a quadrajet carburetor and I have pulled a fitting off the back side of the carburetor where I think the vacuum hose needs to connect. Struggling to figure out what size bar fitting each to go back in there oh, the parts store and hardware store neither have one where I can check the fitting of the plug that was in it. I'm guessing it's 9/16 but not sure of the thread pattern so that I can order the right Barb fitting or find it. Anybody that can confirm the thread and size for that pork?

https://www.summitracing.com/parts/SUM-760197

**4x41971SWB** · 02-09-2020, 01:45 PM

1/4npt

**4x41971SWB** · 02-09-2020, 01:58 PM

What you need is a brass fitting like the one pictured 1/4 pipe x inverted flare and an oem tube. That way you can avoid connecting your vaccum hose to a straight fitting coming out the back of your carb and putting a 90 degree bend in your hose. If you get those two items your hose will stay straight to you booster check valve and a cleaner look.

phlegm · 02-09-2020, 06:22 PM

Awesome guys Thanks!

phlegm · 02-10-2020, 05:35 PM

Thanks again guys, was able to find the right 90degree fitting so I can just run hose straight to the booster (at least it looks right)

will update but I think Im good.

thanks!

phlegm · 02-21-2020, 07:34 PM

hey guys, trying to do this install tonight, I have a simple qeustion I cant find the answer to. I have a firewall boot for the pin to pedal connection. Does the cone go toward engine or in the cab .... I know seems dumb but that one question is holding me up and I didnt have one on my OEM setup (that I can find)

**FirstOwner69** · 02-21-2020, 10:45 PM

In the cab.

phlegm · 02-21-2020, 11:10 PM

Awesome thanks!! That is the way I did it but I just wanted to be certain never messed with this before... Now I can go out there and tighten it all up.

Gonna bleed it in the morning getting to late now.

**update, bled out hooked up and works great. about hit my head on the glass teh first time I was up to speed and went to stop

02-09-2020, 12:46 PM	#1
phlegm Still Green but learning Join Date: Nov 2004 Location: Central NC Posts: 1,895	Break booster install vacuum question Hey guys. I got the summit brake booster kit link here. I have some questions about connecting up be back in. Have a 71 C10 with a quadrajet carburetor and I have pulled a fitting off the back side of the carburetor where I think the vacuum hose needs to connect. Struggling to figure out what size bar fitting each to go back in there oh, the parts store and hardware store neither have one where I can check the fitting of the plug that was in it. I'm guessing it's 9/16 but not sure of the thread pattern so that I can order the right Barb fitting or find it. Anybody that can confirm the thread and size for that pork? https://www.summitracing.com/parts/SUM-760197 Attached Images __________________ -- Cory 71 Cheyenne 10 - SWB, 350, "3 on the tree" AC cab 07 Suburban LTZ 4x4 2010 Acura TL 98 Mastercraft "FrankenStar" 225 27253 UPS/USPS IIOY....nope never was

02-09-2020, 01:45 PM	#2
4x41971SWB Registered User Join Date: May 2016 Location: Escondido CA Posts: 571	Re: Break booster install vacuum question 1/4npt Attached Images

02-09-2020, 01:58 PM	#3
4x41971SWB Registered User Join Date: May 2016 Location: Escondido CA Posts: 571	Re: Break booster install vacuum question What you need is a brass fitting like the one pictured 1/4 pipe x inverted flare and an oem tube. That way you can avoid connecting your vaccum hose to a straight fitting coming out the back of your carb and putting a 90 degree bend in your hose. If you get those two items your hose will stay straight to you booster check valve and a cleaner look. Attached Images

02-09-2020, 06:22 PM	#4
phlegm Still Green but learning Join Date: Nov 2004 Location: Central NC Posts: 1,895	Re: Break booster install vacuum question Awesome guys Thanks! __________________ -- Cory 71 Cheyenne 10 - SWB, 350, "3 on the tree" AC cab 07 Suburban LTZ 4x4 2010 Acura TL 98 Mastercraft "FrankenStar" 225 27253 UPS/USPS IIOY....nope never was

02-10-2020, 05:35 PM	#5
phlegm Still Green but learning Join Date: Nov 2004 Location: Central NC Posts: 1,895	Re: Break booster install vacuum question Thanks again guys, was able to find the right 90degree fitting so I can just run hose straight to the booster (at least it looks right) will update but I think Im good. thanks! __________________ -- Cory 71 Cheyenne 10 - SWB, 350, "3 on the tree" AC cab 07 Suburban LTZ 4x4 2010 Acura TL 98 Mastercraft "FrankenStar" 225 27253 UPS/USPS IIOY....nope never was

02-21-2020, 07:34 PM	#6
phlegm Still Green but learning Join Date: Nov 2004 Location: Central NC Posts: 1,895	Re: Break booster install vacuum question hey guys, trying to do this install tonight, I have a simple qeustion I cant find the answer to. I have a firewall boot for the pin to pedal connection. Does the cone go toward engine or in the cab .... I know seems dumb but that one question is holding me up and I didnt have one on my OEM setup (that I can find) __________________ -- Cory 71 Cheyenne 10 - SWB, 350, "3 on the tree" AC cab 07 Suburban LTZ 4x4 2010 Acura TL 98 Mastercraft "FrankenStar" 225 27253 UPS/USPS IIOY....nope never was

02-21-2020, 10:45 PM	#7
FirstOwner69 Senior Member Join Date: May 2010 Location: Wisconsin & Arizona Posts: 4,839	Re: Break booster install vacuum question In the cab. Attached Images

02-21-2020, 11:10 PM	#8
phlegm Still Green but learning Join Date: Nov 2004 Location: Central NC Posts: 1,895	Re: Break booster install vacuum question Awesome thanks!! That is the way I did it but I just wanted to be certain never messed with this before... Now I can go out there and tighten it all up. Gonna bleed it in the morning getting to late now. *update, bled out hooked up and works great. about hit my head on the glass teh first time I was up to speed and went to stop Attached Images __________________ -- Cory 71 Cheyenne 10 - SWB, 350, "3 on the tree" AC cab 07 Suburban LTZ 4x4 2010 Acura TL 98 Mastercraft "FrankenStar" 225 27253 UPS/USPS IIOY....nope never was Last edited by phlegm; 02-22-2020 at 04:35 PM.*



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