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Brake Lines

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Cuzz

Number of posts : 62
Location : Michigan
Age : 52
Registration date : 2015-07-17

Brake Lines

Post by Cuzz on Sun Aug 06, 2017 3:34 pm

I just finished installed the D&D front disc brake kit and the only thing left is hooking up the hard lines to the new Master Cylinder.. My question is that I followed the existing hard lines and they run like the diagram below, is this OEM to have the left/front brake and both rear brakes run off of one line from the MC and only the right/front off the other line?
I'm a little confused because I'm suppose to run the front and rear separate and wondering if I have to run new lines now..

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Seth G
Vintage-Vans Listings Manager
Vintage-Vans Listings Manager

Number of posts : 1700
Location : Anacortes, WA
Age : 44
Registration date : 2013-04-24

Re: Brake Lines

Post by Seth G on Sun Aug 06, 2017 6:34 pm

It's b/c you have the stock single circuit master cylinder. No it is not normal for any vehicle built after dual master cylinders became standard. That didn't happen on Econolines until '67. If you lose the master or leak you lose all brakes except the e-brake with a single MC, w/ a dual you still have the other circuit, front or back. You need to either find a 67 dual mc and have it rebuilt or install an alternative dual mc.

You should have or should install a #2 residual valve to the front brake circuit and a #10 on the rear circuit b/c the brake cylinders/caliper reservoirs are at or near the level of the master cylinder b/c it's all under the floor. I don't know whether the stock mc's, either style, have a residual valve built into them or not. Hopefully someone who does will chime in.

You should also have a proportioning valve, preferably an adjustable one, installed directly after the master cylinder. Should be: master cylinder>prop valve>residual valves>brakes. Whether or whether not you have a dual master cylinder this should be the case.
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Cuzz

Number of posts : 62
Location : Michigan
Age : 52
Registration date : 2015-07-17

Re: Brake Lines

Post by Cuzz on Sun Aug 06, 2017 6:48 pm

I purchased the master disc brake kit from D&D and it came with a dual MC, which I already installed.. This new MC has internal residual valves already installed.. I assume I just have to do a little re-routing on the hard lines so the back and front are separate. The directions say the front port on the MC is for the front brakes but it never said anything about having to re-route lines which I thought was strange since the directions are so detailed, that's why I threw the question out there... I also thought it was odd to see 3 brakes plumbed to one MC port and wanted to know if that was OEM?
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Seth G
Vintage-Vans Listings Manager
Vintage-Vans Listings Manager

Number of posts : 1700
Location : Anacortes, WA
Age : 44
Registration date : 2013-04-24

Re: Brake Lines

Post by Seth G on Sun Aug 06, 2017 8:52 pm

Yes it was. Sounds like you've got it dialed in. One port to the front, one to the back. I would add the adjustable prop valve to, that way you can dial in the front to back pressure.

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