Brake Line Sizes??? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

BowTieOgre · 03-19-2007, 08:49 PM

Even though it isnt too expensive to just buy the pre-bent brake line kits I think I would really like to bend my own just to have the experience. Im wondering what size tubing I should use. I will have a 4 wheel disc setup using rear rotors from a Caprice. I have a CPP booster/mc/prop valve for a disc/disc application.

It looks like the old drum brake line going across the rearend was about 3/16" and the line running to the front looked a little bigger...maybe 1/4"?

Any suggestions on line sizes, fittings or tips in general would be greatly appreciated.

short69 · 03-19-2007, 10:10 PM

maybe you could just check what size the female fittings are on the prop valve and go with that...I'm guessing that the front and rear lines would be the same size.

BowTieOgre · 03-19-2007, 11:28 PM

I may end up doing that if I dont get any more opinions.

Tx Firefighter · 03-20-2007, 08:29 AM

1/4 and 3/16 are the sizes. Be forewarned though, you'll need to salvage the fittings off of the original lines for some of the connections. The generic straight lines from the parts store are the right diameter, but the fittings sometimes are wrong to screw into the prop valve. The GM fittings are thicker to make the 3/16 line screw into a larger hole.

Just clean em up and put them on the new line before you flare and bend it.

BowTieOgre · 03-20-2007, 08:44 AM

Thanks for the help TXF. I will be sure to post a pic when I get it plumbed.

03-19-2007, 08:49 PM	#1
BowTieOgre Registered User Join Date: Mar 2006 Location: Pensacola, FL Posts: 1,461	Brake Line Sizes??? Even though it isnt too expensive to just buy the pre-bent brake line kits I think I would really like to bend my own just to have the experience. Im wondering what size tubing I should use. I will have a 4 wheel disc setup using rear rotors from a Caprice. I have a CPP booster/mc/prop valve for a disc/disc application. It looks like the old drum brake line going across the rearend was about 3/16" and the line running to the front looked a little bigger...maybe 1/4"? Any suggestions on line sizes, fittings or tips in general would be greatly appreciated. __________________ 1986 C10 - LWB, 305/700r4, posi, vortec heads

03-19-2007, 10:10 PM	#2
short69 Registered User Join Date: Oct 2006 Location: las vegas Posts: 88	Re: Brake Line Sizes??? maybe you could just check what size the female fittings are on the prop valve and go with that...I'm guessing that the front and rear lines would be the same size. __________________ 69 shorty w/ 67 front clip

03-19-2007, 11:28 PM	#3
BowTieOgre Registered User Join Date: Mar 2006 Location: Pensacola, FL Posts: 1,461	Re: Brake Line Sizes??? I may end up doing that if I dont get any more opinions. __________________ 1986 C10 - LWB, 305/700r4, posi, vortec heads Last edited by BowTieOgre; 03-19-2007 at 11:29 PM.

03-20-2007, 08:29 AM	#4
Tx Firefighter Watch out for your cornhole ! Join Date: Jun 2003 Location: Azle, Texas Posts: 14,162	Re: Brake Line Sizes??? 1/4 and 3/16 are the sizes. Be forewarned though, you'll need to salvage the fittings off of the original lines for some of the connections. The generic straight lines from the parts store are the right diameter, but the fittings sometimes are wrong to screw into the prop valve. The GM fittings are thicker to make the 3/16 line screw into a larger hole. Just clean em up and put them on the new line before you flare and bend it. __________________ I'm on the Instagram- @Gearhead_Kevin

03-20-2007, 08:44 AM	#5
BowTieOgre Registered User Join Date: Mar 2006 Location: Pensacola, FL Posts: 1,461	Re: Brake Line Sizes??? Thanks for the help TXF. I will be sure to post a pic when I get it plumbed. __________________ 1986 C10 - LWB, 305/700r4, posi, vortec heads



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