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Single circuit to dual circuit
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   Forward Look Technical Discussions -> Brakes, Wheels and TiresMessage format
 
Todd
Posted 2020-08-02 10:22 AM (#601590)
Subject: Single circuit to dual circuit


Member

Posts: 49
25
hi folks.
My current single circuit master brake cylinder has a 1/4 "line to the front tee. All other lines have only 3/16". Now I would like to convert to a dual circuit brake system. Does one line from the Dual master cylinder have to be thicker here too, or can both lines coming out of the dual circuit master cylinder also have 3/16 "?
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58coupe
Posted 2020-08-02 11:28 AM (#601593 - in reply to #601590)
Subject: Re: Single circuit to dual circuit



Expert

Posts: 1466
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Location: Alaska
The reason the front line is 1/4" is because you are feeding 4 wheel cylinders, 2 on each wheel. The rear is only 1 wheel cylinder on each side. What are you changing, just the master cylinder?
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Todd
Posted 2020-08-02 1:17 PM (#601599 - in reply to #601593)
Subject: Re: Single circuit to dual circuit


Member

Posts: 49
25
Hi. Thanks for reply. I want to change the master brake cylinder (single to dual) and all brake lines.
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Powerflite
Posted 2020-08-02 8:26 PM (#601616 - in reply to #601590)
Subject: Re: Single circuit to dual circuit



Expert 5K+

Posts: 6631
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Location: So. California
I use a special 1/4 type (forgot the thread size) of tube nut on a 3/16 line at the top and block off the rear port.
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71charger_fan
Posted 2020-08-02 9:53 PM (#601621 - in reply to #601590)
Subject: Re: Single circuit to dual circuit


Elite Veteran

Posts: 612
500100
Location: Frederick, MD
You can get a 25' coil of copper nickel brake line with an assortment of fittings off of Ebay for less than $30. I wound up buying the Eastwood on car flaring tool and was very pleased with how well it worked.
https://www.eastwood.com/eastwood-on-car-flaring-tool-for-3-16-tubin...

http://www.forwardlook.net/forums/forums/thread-view.asp?tid=63722&...

Edited by 71charger_fan 2020-08-02 10:15 PM
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51coronet
Posted 2020-08-04 8:59 AM (#601678 - in reply to #601590)
Subject: Re: Single circuit to dual circuit


Extreme Veteran

Posts: 356
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Best flaring tool I have used so far is ridgid
https://www.amazon.com/RIDGID-83037-Precision-Ratcheting-Flaring/dp/...

It is nearly automatic, makes perfect flares each time, can do stainless line easily, not very expensive considering how well it works. You cant lose either piece with how its permanently attached to each other which is weird for me since I have used the dual piece ones for 20+ years. It just works well. Very nice tool. It moves in an orbital motion which flares line very nice. Old ones just pressed into the hole and relied on the tool to hold it without the tube slipping downward. Moving in a small orbit is the proper way to flare lines.
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