dual master conversion review lesson needed
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Laughing Gas
Joined: Jul 2003
Posts: 1,224
Likes: 19
From: scotia. NY 12302
dual master conversion review lesson needed
i purchased a dual master for an all drum '68 mustang. i plan to put in on my f-1 retaining my all drums. i have the engineered components, inc. pickup truck adapter plate to mount the mustang cylinder. since most of the postings are for disc/drum or disc/disc, i have a few questions re: drum/drum. do i need a 10 LB residual valve for front and another for the back line. can i use a "t" for the front line or do i need a "metering valve"? also the eci diagrams for disc set-ups show the line coming from the reservoir closest to the front (pushrod end) goes to the back brakes. is that what i do with mine? i can/will call eci if nec. but i want to learn what i can and i don't want to be buying hardware i don't need. thanks, dick r
Cargo Master
Joined: Feb 2008
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From: Windermere Valley,B.C. Ca
Hotshot
Joined: Oct 2009
Posts: 16,172
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From: Burbank, WA
The link oldf1 posted is a great reference. But in the photos, it shows a GM Corvette style master cylinder, and the hookups for front and rear brakes. On the Ford m/c, they are reversed, where the side closest to the pushrod is for the front brakes, and the one farther away is for the rear brakes.
Cargo Master
Joined: Jun 2001
Posts: 2,571
Likes: 22
From: Oxford, Indiana
Dick,
In the '67 Mustang drum/drum master, both reservoirs are the same size. Consequently, it matters not which one feeds the front brakes. Additionally, it will already have internal RPV's for both circuits. No additional external RPV's are needed and would likely cause more problems than anything if you installed them. Plumbing it up should be nearly identical to the stock setup except for each axle having its own circuit.
In the '67 Mustang drum/drum master, both reservoirs are the same size. Consequently, it matters not which one feeds the front brakes. Additionally, it will already have internal RPV's for both circuits. No additional external RPV's are needed and would likely cause more problems than anything if you installed them. Plumbing it up should be nearly identical to the stock setup except for each axle having its own circuit.
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Laughing Gas
Joined: Jul 2003
Posts: 1,224
Likes: 19
From: scotia. NY 12302
i like what i'm hearing now. eci said to call with your new mc info and they would tell you if you need rpv, etc. i will call just to verify. thanks to all, wanted to learn as much as i can before i start. dick r
Laughing Gas
Joined: Aug 2006
Posts: 815
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From: mountaintop, Pa
I was under the impression new manufactured masters cylinders no longer came with residual valves installed.. is there any way to be 100% certain?
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Cargo Master
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Laughing Gas
Joined: Jul 2003
Posts: 1,224
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From: scotia. NY 12302
now we are getting somewhere, thanks to all. i have the napa36222 new mastercylinder. it looks like the one in old f1's pic. do i need to pull the flare out to see if there is a valve behind it? is that what the pick is for in the pic? don't want to damage it. glad i started this thread, we won't be putting it in until next fall, but i want to be prepared. one last question, do i need the metering valve? is that a stock item, i read somewhere, junkyard only. dick r.
Cargo Master
Joined: Feb 2008
Posts: 2,795
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From: Windermere Valley,B.C. Ca
A sheet metal screw installed into the hole in to the flare seat (brass?) and pry out / up with side cutters, it’s reusable.
Cargo Master
Joined: Jun 2001
Posts: 2,571
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From: Oxford, Indiana
The RPVs in master cylinders that were originally equipped with them are an integral part of the unit and would not have been categorically deleted during the remanufacturing process. They wouldn't sell it without them as the wheel cylinders would quickly start leaking. If your new master is for a drum/drum '67 Mustang and looks like the one in the pic, then it will have RPV's in it. There is no need to pull the flare seats out and go prodding around. I don't know where the idea came from that new master cylinders no longer have RPV's. That's simply not true. If the original application called for them, they're in there. Quit worrying so much and go put it on already! You'll be glad you made the change.
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Laughing Gas
Joined: Jul 2003
Posts: 1,224
Likes: 19
From: scotia. NY 12302
i'm convinced. will put it in as is with the separate front/back lines. i won't be doing it right away because i drive it every day. in late fall we will install ford 9", new brake flex hoses, wheel cyls and the new dual master. we'll have the box off for some rehab, holes in fenders patched and new running boards. can't sacrifice summer driving to do all that. thanks for the great advice. dick r.
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