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03-10-2021, 10:14 PM | #1 |
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Dual chamber master cylinder for drum brakes
Need to replace the master cylinder on my '55 Ford. Keeping stock drum brakes. Is there any particular late '60s-early '70s dual chamber MC for drum brakes that someone can recommend that you have used in this application? I think dual chamber MCs became standard on everything around '66 or '67. I remember a '69 Dodge A-100 van and a '72 Ford pickup I had both had dual chamber MC, drum brakes all around, and no power booster. Wondering if one of those might work, or something for a mid-size Ford car of that vintage? I can do the brake line plumbing to separate front and rear brakes. I know Rambler was the first to have that feature in the early '60s.
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03-10-2021, 11:16 PM | #2 |
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Re: Dual chamber master cylinder for drum brakes
I would think a 70's Mustang would work. just make sure bore is same diameter. If you have a non-power M/C now, stick with non-power M/C as the pocket in the cylinders are different between power and non-power.I don't know why a dual M/C for disc in the front wouldn't work if that's all you can find. may want to add a 10# residual in the front(disc take 2#)as some dual drum/disc M/c's have internal residual valves (2# &10#) and would have wrong RPV for front drums
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03-11-2021, 03:07 AM | #3 | |
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Re: Dual chamber master cylinder for drum brakes
Quote:
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03-11-2021, 07:01 AM | #4 | ||
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Re: Dual chamber master cylinder for drum brakes
Quote:
If you buy a late replacement MC, it will not likely have #10 RPV(s) installed. You then must plumb in inline RPV's to both circuits.. Quote:
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03-11-2021, 07:06 AM | #5 | |
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Re: Dual chamber master cylinder for drum brakes
Quote:
BTW - That clip is available and has an important function. If I were to do a conversion today, I would find a correct take-off and have it sleeved/rebuilt. The RPV's used to come in the FORD rebuild kits.
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03-11-2021, 04:46 PM | #6 |
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Re: Dual chamber master cylinder for drum brakes
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03-17-2021, 02:14 PM | #7 |
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Re: Dual chamber master cylinder for drum brakes
Seems like this has gotten a bit off track with responses, and since you are sticking with a drum to drum master cylinder this video may give you a few pointers being that the Mustang drum/drum master is used in our 50's Fords. https://www.youtube.com/watch?v=WeBDLoGQ79Q&t=71s I love this tool ! https://www.harborfreight.com/brake-...der-92924.html So when I did my brakes on my '54 it was about 108 outside in Phoenix and the garage fridge had cold PBR I somehow forgot to do the bench bleed so I thought I would turn on my compressor hook up the tool and give it a shot starting with the passenger side rear bleeder then moving to the drivers side rear and guess what ? No air and a firm pedal in less than 10 minutes went ahead and did the fronts just because all the wheels cylinders were all new and still no air and a firm pedal. A lot of guys will also convert the old Ford troublesome brake sender to a GM style that works off the pedal by fabricating a simple bracket check the 1952-59 Ford Social Group for pictures of those from the members.
Last edited by JeffB2; 03-17-2021 at 02:26 PM. |
03-17-2021, 04:46 PM | #8 |
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Re: Dual chamber master cylinder for drum brakes
How has this thread gotten off-track in your opinion?
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03-12-2021, 01:35 AM | #9 |
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Re: Dual chamber master cylinder for drum brakes
Regarding the PB MC, the main difference, is in the diameter of the piston. On most Ford's, up until at least '70, the non PB unit, had a 1" piston, the PB, had 7/8".
The smaller piston, will give you higher pressure, to the wheel cylinders but, with a little more brake pedal travel.
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03-12-2021, 11:17 AM | #10 | |
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Re: Dual chamber master cylinder for drum brakes
Quote:
Make sure you will have sufficient pedal travel to completely bottom out the piston(s) in the master cylinder. Check before adding the brake fluid. When you lose fluid/pressure on one side of a dual master cylinder the pedal will go almost completely to the floor before any braking action occurs. If the linkage is not engineered right, the pedal may hit the floor before the piston in the master cylinder travels far enough to apply the brakes. When all is buttoned up and bled, crack a bleeder screw loose on a rear wheel cylinder and see if you can stop (don't do this in the garage in front of your work bench!). Close the rear bleeder and repeat on the fronts. Rebleed if necessary. |
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03-12-2021, 02:05 PM | #11 |
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Re: Dual chamber master cylinder for drum brakes
1967 Fairlanes also had dual master cylinder drum brakes. Except the GT that had disc fronts.
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03-12-2021, 06:24 PM | #12 |
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Re: Dual chamber master cylinder for drum brakes
It sounds like you're getting some solid leads, Lamar. I put a dual reservoir on my '54 wagon with drum brakes maybe 8-10 years ago. I don't remember where I got it, or if the '54 application will work for '55, but if you strike out on your leads, pm me and I'll try and track down the receipt, which I'm pretty sure I still have. I won't bother looking until you need the info, though.
I know I bought it as something that was marketed as an upgrade to 2 reservoir for '54 Fords, so it wasn't some crap shoot engineering effort. It's worked good over the years. |
03-13-2021, 08:35 AM | #13 |
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Re: Dual chamber master cylinder for drum brakes
The period DUAL RESERVOIR MC(s) you want are 1967-1973 FORD INTERMEDIATE (FAIRLANE-MUSTANG).
DRUM/DRUM and DISC/DRUM are included for availability I had the chart (from the 1965/1972 MPC), that shows application, manual/power and bore size. The text would also include info regarding the valving used in the period. I have a current computer problem(s) and will post that info as soon as I can. If you buy a current production replacement MC, it will most likely not have the RPV(s) in the outlet circuits. You will have to plumb inline valves.
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03-14-2021, 04:34 PM | #14 |
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Re: Dual chamber master cylinder for drum brakes
Lamar, I got your message, but don't think my messages are getting back to you. I can't find my receipt, but will take a pic of what I've got and send it to you. I'd bet KULTULZ's recommendation is the way to go. He's kinda the man around here. Nevertheless, I'll get a pic of what I've got to you, if I can.
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03-15-2021, 04:37 PM | #15 |
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Re: Dual chamber master cylinder for drum brakes
Just a warning, beware of these so-called disc brake changeover vendors. Few seem to have full comprehension and now are supplying off-shore parts.
Case in point, this individual went to an EvilBay vendor with a four wheel manual drum pickup and talked to the guy. Said he wanted power dual reservoir drum for now but would like to add front disc later. Below are photos of what he was sold and installed- Now he has to can it and start over.
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03-16-2021, 11:45 AM | #16 | |
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Re: Dual chamber master cylinder for drum brakes
Quote:
All he has to do is switch the lines going into the combo valve, so the secondary (smaller) rear brake M/C chamber goes between the prop valve adjuster and pressure switch, and the larger front M/C chamber goes to the front of the pressure switch with the two output ports. When front discs are installed, removal of the red 10 lb residual is all that's needed. |
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04-22-2021, 04:48 AM | #17 | ||
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Re: Dual chamber master cylinder for drum brakes
Quote:
Quote:
Below are the chart(s) for the 1967-1971 dual reservoir MC (application and bore size) (FAIRLANE - MUSTANG). They originally came with the RPV(s) installed. The valves were not available from FORD separately for service but were included in their MC overhaul kits. Any current new service replacement (or possibly rebuild) will most likely not have this valve(s) installed. |
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03-16-2021, 08:33 AM | #18 |
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Re: Dual chamber master cylinder for drum brakes
What style residual pressure valves (rpv’s) are you using?
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03-17-2021, 03:37 AM | #19 |
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Re: Dual chamber master cylinder for drum brakes
Sorry about that.
Inline (after MC) valves. They should be mounted as near the MC as possible.
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04-06-2021, 05:02 PM | #20 | |
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Re: Dual chamber master cylinder for drum brakes
Quote:
Hmmm, need to tell this to Mercury. My '67 Cougar with factory front discs had the residual check valve mounted on the floor pan directly above the rear axle! (I removed it when installing a new master with a built-in valve.) |
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