Help - Converted to Front and Rear Disc, now what size for hard lines - The 1947 - Present Chevrolet & GMC Truck Message Board Network

88Stanger · 06-26-2018, 10:29 PM

ok, so i changed out the old drum system to new front and rear disc. now i am looking to install the new hard lines. I have searched and i am trying to figure out what size to use for the hard lines. Mainly to the rear is where i am lost. I purchased a complete front SS kit from Classic Industries, but the rear hard lines, what size? i know there is one line to the Rearend dist. block then hard lined to each disc where it then converts to soft lines. these damn hard lines, what size? I read 1/4" then 3/16" but i need to make sure.
Thanks for your time.

88Stanger · 06-27-2018, 03:58 PM

I have done more searching on here, on other places and I am still not sure what the size of the front to rear brake line should be, and then the two hard lines that run on the rearend. I can only assume that the front to rear is 1/4" and then the two that are on the rearend are 3/16".
Any help is greatly appreciated,

**sauxs** · 06-27-2018, 07:47 PM

I'm fairly new to 67-72 Chevy Trucks. But, I converted my 67 Camaro to 4 wheel disc with hydro boost. I used the same size lines as factory and with the hydro boost it will throw you thru the windshield if you stand on it. Don't know if it's the same with c10's, but that's my experience with my Camaro..

88Stanger · 06-28-2018, 03:36 PM

Thanks for the reply, that is what I will end up with if I cannot make my current setup work for me. Hydoboost is spendy, but damn do you stop.

Lanman1972 · 06-28-2018, 03:53 PM

I recently purchased a complete brake line kit from Inline Tube. Maybe look at their website for info.

phat69 · 06-28-2018, 10:13 PM

Hydro boost is the best.

*randy500* · 06-28-2018, 11:18 PM

Stock size lines are 3/16 front and 1/4 to the rear, probably should stick with that.
On the actual rear end the lines are 3/16

**HO455** · 06-29-2018, 01:48 AM

I have no idea what the kit you may have for the rear end, but the 5 lug rear end in my Burban has 1/4" to the flex hose to the axle then the lines on the axle are 3/16". The fitting on the axle end of the flex hose is set up for 1/4" fittings so you have to use a 1/4" inverted flare to 3/16" tube fitting. The wheel cylinders are set up for 3/16" fittings. There is more information on flex hoses and fittings on page 8 of my WMB thread below.
Good luck.

06-26-2018, 10:29 PM	#1
88Stanger Registered User Join Date: Mar 2015 Location: Washington State Posts: 1,654	Help - Converted to Front and Rear Disc, now what size for hard lines ok, so i changed out the old drum system to new front and rear disc. now i am looking to install the new hard lines. I have searched and i am trying to figure out what size to use for the hard lines. Mainly to the rear is where i am lost. I purchased a complete front SS kit from Classic Industries, but the rear hard lines, what size? i know there is one line to the Rearend dist. block then hard lined to each disc where it then converts to soft lines. these damn hard lines, what size? I read 1/4" then 3/16" but i need to make sure. Thanks for your time.

06-27-2018, 03:58 PM	#2
88Stanger Registered User Join Date: Mar 2015 Location: Washington State Posts: 1,654	Re: Help - Converted to Front and Rear Disc, now what size for hard lines I have done more searching on here, on other places and I am still not sure what the size of the front to rear brake line should be, and then the two hard lines that run on the rearend. I can only assume that the front to rear is 1/4" and then the two that are on the rearend are 3/16". Any help is greatly appreciated,

06-27-2018, 07:47 PM	#3
sauxs Junior Member Join Date: Feb 2018 Location: Mid MO Posts: 93	Re: Help - Converted to Front and Rear Disc, now what size for hard lines I'm fairly new to 67-72 Chevy Trucks. But, I converted my 67 Camaro to 4 wheel disc with hydro boost. I used the same size lines as factory and with the hydro boost it will throw you thru the windshield if you stand on it. Don't know if it's the same with c10's, but that's my experience with my Camaro..

06-28-2018, 03:36 PM	#4
88Stanger Registered User Join Date: Mar 2015 Location: Washington State Posts: 1,654	Re: Help - Converted to Front and Rear Disc, now what size for hard lines Thanks for the reply, that is what I will end up with if I cannot make my current setup work for me. Hydoboost is spendy, but damn do you stop.

06-28-2018, 03:53 PM	#5
Lanman1972 Registered User Join Date: Dec 2013 Location: Omaha NE Posts: 620	Re: Help - Converted to Front and Rear Disc, now what size for hard lines I recently purchased a complete brake line kit from Inline Tube. Maybe look at their website for info. __________________ 1972 C10 Custom Deluxe LWB, 402/400, PS, PB, A/C, Highlander, Hugger / White 1971 C10 Cheyenne LWB (SWB), 350/350, PS, PB, A/C, Dark Olive / White.

06-28-2018, 10:13 PM	#6
phat69 Registered User Join Date: Mar 2018 Location: Texas Posts: 51	Re: Help - Converted to Front and Rear Disc, now what size for hard lines Hydro boost is the best.

06-28-2018, 11:18 PM	#7
randy500 Account Suspended Join Date: Jul 2016 Location: Tacoma, WA Posts: 6,873	Re: Help - Converted to Front and Rear Disc, now what size for hard lines Stock size lines are 3/16 front and 1/4 to the rear, probably should stick with that. On the actual rear end the lines are 3/16

06-29-2018, 01:48 AM	#8
HO455 Post Whore Join Date: Feb 2016 Location: Portland Oregon Posts: 11,351	Re: Help - Converted to Front and Rear Disc, now what size for hard lines I have no idea what the kit you may have for the rear end, but the 5 lug rear end in my Burban has 1/4" to the flex hose to the axle then the lines on the axle are 3/16". The fitting on the axle end of the flex hose is set up for 1/4" fittings so you have to use a 1/4" inverted flare to 3/16" tube fitting. The wheel cylinders are set up for 3/16" fittings. There is more information on flex hoses and fittings on page 8 of my WMB thread below. Good luck. __________________ 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

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