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brake line sizing #1708765 12/10/14 12:10 AM 12/10/14 12:10 AM
Joined: Oct 2003 Posts: 7,506 Az Crizila OP master
Crizila OP master Joined: Oct 2003 Posts: 7,506 Az	About to start designing a brake system for my 33. Going with AN stuff for the most part. Also thinking about plumbing it all in -3 ( 3/16" ) line. Any thoughts about using -4 ( 1/4" ) off the master and then down to -3 to the brakes? 4 wheel disc with GM calipers. Thanks, John Fastest 300

Re: brake line sizing [Re: Crizila] #1708766 12/10/14 12:26 AM 12/10/14 12:26 AM
Joined: Sep 2003 Posts: 19,294 north of coder moparx "Butt Crack Bob"
moparx "Butt Crack Bob" Joined: Sep 2003 Posts: 19,294 north of coder	are you contemplating using all braided line ? or just for the 3 flex points[both front wheels and the rear end]? or am i just missing the size [an] point ? as for the sizing, 3/16 is really all you need.

Re: brake line sizing [Re: moparx] #1708767 12/10/14 12:04 PM 12/10/14 12:04 PM
Joined: Oct 2003 Posts: 7,506 Az Crizila OP master
Crizila OP master Joined: Oct 2003 Posts: 7,506 Az	On the line size, just wanna make sure I won't have any "volume" issues. Pretty sure 3/16" will be fine. Except for the flex points, the rest will be hard lined in 3/16". Fastest 300

Re: brake line sizing [Re: Crizila] #1708768 12/10/14 02:03 PM 12/10/14 02:03 PM
Joined: Jan 2003 Posts: 16,376 D dogdays I Live Here
dogdays I Live Here D Joined: Jan 2003 Posts: 16,376	If we assume that the brake fluid is incompressible and the lines don't expand with pressure, then the volume you shove into one end of a filled line is the same volume that will come out at the other end, no matter what the size. I don't believe I've ever seen 1/4" line on brakes. The above assumptions are not 100% correct but they are close enough to work. R.

Re: brake line sizing [Re: dogdays] #1708769 12/10/14 06:49 PM 12/10/14 06:49 PM
Joined: Oct 2003 Posts: 7,506 Az Crizila OP master
Crizila OP master Joined: Oct 2003 Posts: 7,506 Az	10-4 on that. Thanks. Fastest 300

Re: brake line sizing [Re: Crizila] #1708770 12/11/14 03:53 PM 12/11/14 03:53 PM
Joined: Jan 2003 Posts: 25,714 Rio Linda, CA John_Kunkel Too Many Posts
John_Kunkel Too Many Posts Joined: Jan 2003 Posts: 25,714 Rio Linda, CA	Volume versus velocity. Lots of older cars had 1/4" brake lines. The INTERNET, the MISinformation superhighway

Re: brake line sizing [Re: Crizila] #1708771 12/11/14 05:05 PM 12/11/14 05:05 PM
Joined: Feb 2005 Posts: 28,312 Cincinnati, Ohio Challenger 1 Too Many Posts
Challenger 1 Too Many Posts Joined: Feb 2005 Posts: 28,312 Cincinnati, Ohio	I have used 3/16 steel line and #3 fittings on many scratch built dragsters that went 265 mph. They always stopped real well. It's all you need, imo.

Re: brake line sizing [Re: John_Kunkel] #1708772 12/11/14 05:45 PM 12/11/14 05:45 PM
Joined: Oct 2003 Posts: 7,506 Az Crizila OP master
Crizila OP master Joined: Oct 2003 Posts: 7,506 Az	Quote: Volume versus velocity. Lots of older cars had 1/4" brake lines. Ya, kinda why I asked John. Assume most of them were drum/drum or disc/drum. Since this is a 4 wheel disc application, and I will be using two separate masters with 1" bores each, don't think I am going to have any volume issues. Pedal ratio will be 6.25:1 for this manual system, so pedal pressure shouldn't be to hi. Fastest 300

Re: brake line sizing [Re: dogdays] #1708773 02/19/15 07:53 PM 02/19/15 07:53 PM
Joined: Nov 2014 Posts: 28 Montana D DDodger member
DDodger member D Joined: Nov 2014 Posts: 28 Montana	Quote: If we assume that the brake fluid is incompressible and the lines don't expand with pressure, then the volume you shove into one end of a filled line is the same volume that will come out at the other end, no matter what the size. I don't believe I've ever seen 1/4" line on brakes. The above assumptions are not 100% correct but they are close enough to work. R. All hoses will expand "some" maybe not "much". But the larger they are the more they expand. I'd use no3 and keep hoses as short as possible.

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