Need 'OD' sizes for front hard brake lines '72' - The 1947 - Present Chevrolet & GMC Truck Message Board Network

gulfcoast66 · 08-04-2009, 12:09 PM

Well what i have going on is, I replaced drums for disk on my 66 with all 72 hardware. O.K. what im looking for is what size metal lines do i need to bend them myself from the prop valve to the rubber brake lines? Do anyone have any tips or pics, THANKS Chris..........[IMG][IMG]

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gulfcoast66 · 08-04-2009, 12:10 PM

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**Classic Heartbeat** · 08-04-2009, 12:17 PM

I believe the brake line diameter is 5/16" for front and 1/4" for rear. WES

gulfcoast66 · 08-04-2009, 12:24 PM

Quote:

Originally Posted by Classic Heartbeat

I believe the brake line diameter is 5/16" for front and 1/4" for rear. WES

Thanks for your help Classic Heartbeat............ Chris...

**Classic Heartbeat** · 08-04-2009, 12:26 PM

Your welcome.

WES

**Stocker** · 08-04-2009, 12:26 PM

My '72 OEM hard lines are 1/4" and 3/16".

**CPNE** · 08-04-2009, 12:30 PM

Quote:

Originally Posted by Classic Heartbeat

I believe the brake line diameter is 5/16" for front and 1/4" for rear. WES

I believe Wes meant 3/16th not 5/16th. The rears are 1/4 and the fronts are smaller

gulfcoast66 · 08-04-2009, 12:31 PM

Well if it helps the 72 brakes are 1/2 ton set-up...

**JJanzen** · 08-04-2009, 12:31 PM

I just installed new SS lines on my 72. The hoses are different on each side up front. They change from the splitter that is located right below the master cylinder. The hard line that goes to the driver's side is a 7/16" nut and the passenger side is a 3/8" nut. Sounds crazy but when I ordered the rubber lines and they were both different, I questioned the supplier. Sure enough, when my brake lines came, they were both different. If you need some pics, let me know and I will take some for you.

gulfcoast66 · 08-04-2009, 12:37 PM

YES PICS!! I have installed the lines from the master to the prop val. from the pro val to rubber lines is were im stuck at, Chris...

gulfcoast66 · 08-04-2009, 12:38 PM

[IMG]

[/IMG]

**Classic Heartbeat** · 08-04-2009, 12:41 PM

I have read too many post this morning..lol CPNE is correct 3/16" front..lol WES

**JJanzen** · 08-04-2009, 01:04 PM

It looks like to me you have both the passenger and the driver's side line coming out of the proportioning valve. There are two lines that come out of the proportioning valve, one is for the rear and one is for the front. The front runs down and goes into a brass splitting block (I got mine at NAPA). From the splitting block, the driver's side goes up and over the front cross member and then turns out towards the wheel to the bracket where the rubber hose mounts into. The passenger side runs along the bottom of the front cross member with the rear line. Once it gets past the motor, it turns up and over the top of the front cross member and into the bracket where the rubber hose mounts. Hopefully the attached pictures show what I am trying to describe. You might also do a search....I found some great pics when installing mine from one of the members on the board. Good luck!

Joel

**JJanzen** · 08-04-2009, 01:07 PM

More Pics

08-04-2009, 12:09 PM	#1
gulfcoast66 64-66 CHEVY JUNKIE Join Date: Apr 2007 Location: Cypress ,Texas Posts: 1,516	Need 'OD' sizes for front hard brake lines '72' Well what i have going on is, I replaced drums for disk on my 66 with all 72 hardware. O.K. what im looking for is what size metal lines do i need to bend them myself from the prop valve to the rubber brake lines? Do anyone have any tips or pics, THANKS Chris..........[IMG][IMG][/IMG][/IMG] __________________ 1966 C-10 Fleetside LWB, 350 Lt1 4l60-E 2008 Silverado Crew Cab, 4.8 4l60-E 1998 GMC Yukon 4x4 L-31 Vortec, 4l60-E 2017 GMC Serra 4x4 5.3 Vortec, 4l60-E Do It In A Chevrolet

08-04-2009, 12:10 PM	#2
gulfcoast66 64-66 CHEVY JUNKIE Join Date: Apr 2007 Location: Cypress ,Texas Posts: 1,516	Re: Need 'OD' sizes for front hard brake lines '72' [IMG][/IMG] __________________ 1966 C-10 Fleetside LWB, 350 Lt1 4l60-E 2008 Silverado Crew Cab, 4.8 4l60-E 1998 GMC Yukon 4x4 L-31 Vortec, 4l60-E 2017 GMC Serra 4x4 5.3 Vortec, 4l60-E Do It In A Chevrolet

08-04-2009, 12:17 PM	#3
Classic Heartbeat Project Junkie! Fishing Poor!! Join Date: Dec 1999 Location: Olympia,Wa. 98512 Posts: 10,770	Re: Need 'OD' sizes for front hard brake lines '72' I believe the brake line diameter is 5/16" for front and 1/4" for rear. 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

08-04-2009, 12:26 PM	#5
Classic Heartbeat Project Junkie! Fishing Poor!! Join Date: Dec 1999 Location: Olympia,Wa. 98512 Posts: 10,770	Re: Need 'OD' sizes for front hard brake lines '72' Your welcome. 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

08-04-2009, 12:26 PM	#6
Stocker 20' Daredevil (Ret) Join Date: May 2003 Location: Jefferson State Posts: 13,617	Re: Need 'OD' sizes for front hard brake lines '72' My '72 OEM hard lines are 1/4" and 3/16". __________________ - Mike - 1972 K20 LWB 350/350/205 RIP El Jay

08-04-2009, 12:31 PM	#8
gulfcoast66 64-66 CHEVY JUNKIE Join Date: Apr 2007 Location: Cypress ,Texas Posts: 1,516	Re: Need 'OD' sizes for front hard brake lines '72' Well if it helps the 72 brakes are 1/2 ton set-up... __________________ 1966 C-10 Fleetside LWB, 350 Lt1 4l60-E 2008 Silverado Crew Cab, 4.8 4l60-E 1998 GMC Yukon 4x4 L-31 Vortec, 4l60-E 2017 GMC Serra 4x4 5.3 Vortec, 4l60-E Do It In A Chevrolet

08-04-2009, 12:31 PM	#9
JJanzen Senior Member Join Date: Feb 2008 Location: Denver, CO Posts: 252	Re: Need 'OD' sizes for front hard brake lines '72' I just installed new SS lines on my 72. The hoses are different on each side up front. They change from the splitter that is located right below the master cylinder. The hard line that goes to the driver's side is a 7/16" nut and the passenger side is a 3/8" nut. Sounds crazy but when I ordered the rubber lines and they were both different, I questioned the supplier. Sure enough, when my brake lines came, they were both different. If you need some pics, let me know and I will take some for you. __________________ Blue72 Red72

08-04-2009, 12:37 PM	#10
gulfcoast66 64-66 CHEVY JUNKIE Join Date: Apr 2007 Location: Cypress ,Texas Posts: 1,516	Re: Need 'OD' sizes for front hard brake lines '72' YES PICS!! I have installed the lines from the master to the prop val. from the pro val to rubber lines is were im stuck at, Chris... __________________ 1966 C-10 Fleetside LWB, 350 Lt1 4l60-E 2008 Silverado Crew Cab, 4.8 4l60-E 1998 GMC Yukon 4x4 L-31 Vortec, 4l60-E 2017 GMC Serra 4x4 5.3 Vortec, 4l60-E Do It In A Chevrolet

08-04-2009, 12:38 PM	#11
gulfcoast66 64-66 CHEVY JUNKIE Join Date: Apr 2007 Location: Cypress ,Texas Posts: 1,516	Re: Need 'OD' sizes for front hard brake lines '72' [IMG][/IMG] __________________ 1966 C-10 Fleetside LWB, 350 Lt1 4l60-E 2008 Silverado Crew Cab, 4.8 4l60-E 1998 GMC Yukon 4x4 L-31 Vortec, 4l60-E 2017 GMC Serra 4x4 5.3 Vortec, 4l60-E Do It In A Chevrolet

08-04-2009, 12:41 PM	#12
Classic Heartbeat Project Junkie! Fishing Poor!! Join Date: Dec 1999 Location: Olympia,Wa. 98512 Posts: 10,770	Re: Need 'OD' sizes for front hard brake lines '72' I have read too many post this morning..lol CPNE is correct 3/16" front..lol 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

08-04-2009, 01:04 PM	#13
JJanzen Senior Member Join Date: Feb 2008 Location: Denver, CO Posts: 252	Re: Need 'OD' sizes for front hard brake lines '72' It looks like to me you have both the passenger and the driver's side line coming out of the proportioning valve. There are two lines that come out of the proportioning valve, one is for the rear and one is for the front. The front runs down and goes into a brass splitting block (I got mine at NAPA). From the splitting block, the driver's side goes up and over the front cross member and then turns out towards the wheel to the bracket where the rubber hose mounts into. The passenger side runs along the bottom of the front cross member with the rear line. Once it gets past the motor, it turns up and over the top of the front cross member and into the bracket where the rubber hose mounts. Hopefully the attached pictures show what I am trying to describe. You might also do a search....I found some great pics when installing mine from one of the members on the board. Good luck! Joel Attached Images __________________ Blue72 Red72

08-04-2009, 01:07 PM	#14
JJanzen Senior Member Join Date: Feb 2008 Location: Denver, CO Posts: 252	Re: Need 'OD' sizes for front hard brake lines '72' More Pics Attached Images __________________ Blue72 Red72



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