Brake line question - need some input - The 1947 - Present Chevrolet & GMC Truck Message Board Network

**ScottH** · 09-08-2018, 07:19 PM

First I searched & read quite a few threads on this but none addressed my specific question, so here goes:

Working on a 65 c10 & in the process of installing disc brakes. PO did very little right on this truck. He did replace the brakes & lines but not sure he used the correct size for the rear line.

I have read several posts that say 3/16" for front lines, and 1/4" for rear line up to the T fitting. Have also read that some noted pre 66 trucks had 3/16" for the long rear line.

So 1st question is the existing rear 3/16" ok to use? 2nd question deals with the disc brake kit I'm installing. It came with braided steel front hose lines that take a 1/4" line connection. Should I use 1/4" lines in the front or get an adapter for the hoses to run front 3/16" lines?

Any info or suggestions is much appreciated. Thanks guys.

**PGSigns** · 09-08-2018, 07:56 PM

Scott i have 1/4" lines to all my brakes on my 66. Every thing in the front is 73 to 87. Works fine. I used a line from the rear to the frame that was also 1/4 on the frame end and it is 3/16 to the rear wheel cylinders.
Jimmy

**ScottH** · 09-09-2018, 09:31 AM

Thanks 4 the info Jimmy.

Anyone else?

DLW · 09-09-2018, 03:28 PM

I Just made new stainless lines for my truck last weekend. I have 4 wheel disk brakes and I used 3/16" line from master cylinder out to all 4 brakes. I would keep everything 3/16" same as the rear already is. There is a lot of info on the internet from pretty smart people that know hydraulic's and Pascal's Principle, line sizes and so forth.

09-08-2018, 07:19 PM	#1
ScottH Senior Member Join Date: Sep 2002 Location: Hampstead, NC Posts: 8,184	Brake line question - need some input First I searched & read quite a few threads on this but none addressed my specific question, so here goes: Working on a 65 c10 & in the process of installing disc brakes. PO did very little right on this truck. He did replace the brakes & lines but not sure he used the correct size for the rear line. I have read several posts that say 3/16" for front lines, and 1/4" for rear line up to the T fitting. Have also read that some noted pre 66 trucks had 3/16" for the long rear line. So 1st question is the existing rear 3/16" ok to use? 2nd question deals with the disc brake kit I'm installing. It came with braided steel front hose lines that take a 1/4" line connection. Should I use 1/4" lines in the front or get an adapter for the hoses to run front 3/16" lines? Any info or suggestions is much appreciated. Thanks guys. __________________ 1963 C10 swb fleetside 1966 GMC G1000 Handi-bus (future project) 1955 Chevy 2 dr. wagon 2008 Corvette convertible Last edited by ScottH; 09-09-2018 at 09:33 AM.

09-08-2018, 07:56 PM	#2
PGSigns Senior Member Join Date: Jan 2011 Location: Hayes Va Posts: 4,569	Re: Brake line question - need some input Scott i have 1/4" lines to all my brakes on my 66. Every thing in the front is 73 to 87. Works fine. I used a line from the rear to the frame that was also 1/4 on the frame end and it is 3/16 to the rear wheel cylinders. Jimmy __________________ 60 to 66 Chevy and GMC window decals http://67-72chevytrucks.com/vboard/s...d.php?t=661131 Good friends, good food and a hotrod what else do you need? 1966 BBW long fleet Daily driver 1965 BBW short fleet Sold and going to a good home 1965 Suburban 2003 3500 Duramax 2005 Ultra Classic

09-09-2018, 09:31 AM	#3
ScottH Senior Member Join Date: Sep 2002 Location: Hampstead, NC Posts: 8,184	Re: Brake line question - need some input Thanks 4 the info Jimmy. Anyone else? __________________ 1963 C10 swb fleetside 1966 GMC G1000 Handi-bus (future project) 1955 Chevy 2 dr. wagon 2008 Corvette convertible

09-09-2018, 03:28 PM	#4
DLW Registered User Join Date: Apr 2014 Location: Union City, CA Posts: 384	Re: Brake line question - need some input I Just made new stainless lines for my truck last weekend. I have 4 wheel disk brakes and I used 3/16" line from master cylinder out to all 4 brakes. I would keep everything 3/16" same as the rear already is. There is a lot of info on the internet from pretty smart people that know hydraulic's and Pascal's Principle, line sizes and so forth.



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