disc / disc brake plumbing help |
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Speedy
Member Joined: 07 Apr. 2010 Location: Toronto Canada Status: Offline Points: 531 |
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Posted: 11 June 2021 at 7:55pm |
so I am getting ready to do my brake lines.
I am running herms dual master pv4c proportioning valve and dana 30 caliper disc front k10 caliper disc rear I searched allot and seems like everyone runs 3/16 line all around. I am wondering should 1/4 from the master cylinder to the proportioning valve (both circuit lines) then run the 3/16 on both the outs on the front of the proportioning valve (assuming I can use both) then run 1/4 to the rear then split to 3/16 to possibly further complicate things, can I run two flex hoses front the caliper to the frame rail like a modern setup on the rear and front. IF so, I would just purchase a T to transition the 1/4 to 3/16 line somewhere at the rear crossmember. trying to get it right the first time around so figured I could ask if anyone has disc disc setup and what works.
Edited by Speedy - 11 June 2021 at 7:56pm |
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- Mike
47 CJ2A - Warn OD, Ramsey PT1-J/Koenig 100,Arctic top,Dana 44 30 spline full float with disc's,Dana 30 with discs, 2.5 lift, Saginaw power steering, dual master cylinder |
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Rus Curtis
Member Joined: 25 Mar. 2010 Location: Alabama Status: Offline Points: 1733 |
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From the vehicles I've worked on, I've only seen 3/16" brake lines. My jeep has 1/4" gas lines.
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Rus Curtis
Alabama 1954 CJ3B Bantam T3-C |
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duffer
Member Joined: 02 Feb. 2012 Location: Bozeman, MT Status: Offline Points: 1076 |
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I'm using the Scout II discs up front, the D30 discs on the rear, Wilwood proportioning valve and master cylinder, all plumbed with 3/16's. I ran D30 discs on both ends for 30 something years with the same size lines. 3/16" is all you need.
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1955 3B: 441sbc,AGE 4 speed transmission, Teralow D18w/Warn OD, 4.11:1 D44's/ARB's, glass tub & fenders, aluminum hood/grill, 8274, York OBA, Premier Power Welder; 67 CJ5: 225,T86AA, D18, 4.88's, OD
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nofender
Member Sponsor Member x 3 Joined: 10 May 2016 Location: Maryland Status: Offline Points: 2018 |
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As others have stated, I can't see any value in going 1/4 inch.
As for the soft lines at each corner - sure there is no issue doing that. Just make sure you use a line long enough to match your suspension travel. Me - I use a flexible line dropped to the center of the axle. Then flex lines at each wheel. This way suspension travel isn't an issue at all. No real wrong path to take. It's a matter of preference and matching your set up with the best options.
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46 CJ2a rockcrawler
46 CJ2a - 26819 46 Bantam T3c "4366" 47 Bantam T3C - 11800 68-ish CJ5 |
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OnlyOneDR
Member Joined: 05 July 2016 Location: R Status: Offline Points: 456 |
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Pretty much all cars and light trucks use 3/16" lines. There is no value to going with a larger line. Ideally you want the smallest lines possible to minimize the ability of the lines to swell so you have good hard brakes. Larger lines mean more surface area to stretch and more fluid to compress.
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Searching for time to put it all together...
1950 CJ-3A #37751 In Pieces 1969 Chevy Blazer Resto-Mod Waiting for its day... 2001 Nissan Frontier Crawler Adventure Rig |
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Speedy
Member Joined: 07 Apr. 2010 Location: Toronto Canada Status: Offline Points: 531 |
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thanks everyone.
3/16 it is. all the orifices match 3/16, except the proportioning valve for the rear is 1/4 so threw me off. I am now wondering if possibly I can tell if my MC is for disc/disc? ordered the parts so long ago and don't see any part numbers or info on the receipt or can anyone suggest what MC is best? running herms bracket. any terminal block I can use for the rear to split to two lines (maybe the stock diff housing T will work) and if its a stretch, if anyone knows what flex lines can work coming down from the frame to the caliper. running a 2.5'' lift. (I will investigate chev 1/2 ton lines) however, I will give the rear caliper flex lines to frame some thought. maybe sticking to the stock setup is best. one line coming down from the centre
Edited by Speedy - 12 June 2021 at 12:25pm |
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- Mike
47 CJ2A - Warn OD, Ramsey PT1-J/Koenig 100,Arctic top,Dana 44 30 spline full float with disc's,Dana 30 with discs, 2.5 lift, Saginaw power steering, dual master cylinder |
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