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Supreme Being
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MikeLongIsland (5/16/2009)
When I started my research, I was told 10lb residual valve in the rear for the drums and 2lb in the front for disks, I was told I had to use these because of the frame mounted master and the fact that the bleeders were higher than the master.
That is correct.
54 Victoria 312; 27T 255 Flathead, 48 Ford Conv 302, 56 Bird
Forever Ford
Midland Park, NJ
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Supreme Being
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Tom: A late question on this topic. For a 57 Car on Drums, is the 68 Bronco Master cylinder a dual chamber unit, & available for manual brakes? And when you say the pushrod needs to be adjusted, do you mean cut or a piece welded in?
Paul
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Supreme Being
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PF Arcand (6/8/2009)
Tom: A late question on this topic. For a 57 Car on Drums, is the 68 Bronco Master cylinder a dual chamber unit, & available for manual brakes? And when you say the pushrod needs to be adjusted, do you mean cut or a piece welded in?Paul; I have done a couple of 54-57 Fords with the 68 Bronco master cyl. Yes it is a dual chamber made for drum all around. There are 2 listed on for 6 cyl and one for a 8 cyl ( different bore size) I believe that I took the rubber bumper off from the pedal return so there would be free play in the pedal.or you could shorten it a little T M
 in Bethel ,Vermont (aka: Bluedot Kid)1962-68 45th ENG. (DT) School of Hard Knocks C l a s s of 1960
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Supreme Being
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Tom: thanks for the clarification. Splitting the system on my car would be a good safety idea, plus I want to check out my existing Master, as I suspect based on info from this site, that it may be a power brake unit. The braking effort is very hard..
Paul
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Forum Newbie
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| There are no residual valves in the drum-drum masters. If there were, you could never release the brakes because the presssure will not be released as it should. I will also discourage use of disc-drum masters unless you have disc brakes! I've updated 4 of my cars to dual master and used the 1967 Mustang drum-drum master in all. There some applications that will have the lines out the engine side but don't remember which. I'm also not going to discs on front until I go above 125 mph at the strip. Drums are doing fine so far.
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Supreme Being
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| Dennis: The drum masters that I am familiar with are assembled as follows. A rubber washer, a check valve, a spring, and the piston assembly. The check valve allows fluid to flow freely to the brake cylinders when you push the pedal. When you release the pedal, the return springs on the shoes forces the fluid back to the master. When the fluid meets the now closed check valve, it unseats the valve from its rubber washer. The spring re-seats the check valve when line pressure drops to about 10 psi. Is this not a residial valve?
John - "The Hoosier Hurricane"
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Supreme Being
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I think there is some confusion between residual valves and proportioning valves going on here. another thing to remember is that the front line of the master is for the rear brakes and the rear outlet of the master for the front brakes. How many people get this mixed up when doing conversions?
 55 Vicky & customline 58 Rack Dump, 55 F350 yard truck, 57 F100 59 & 61 P 400's, 58 F100 custom cab, 69 F100, 79 F150, 82 F600 ramp truck, 90 mustang conv 7 up, 94 Mustang, Should I continue?
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Supreme Being
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| So I'm thinking about upgrading to a dual resevoir, and I'm trying to predict in advance which master cylinder option creates the "path of least resistance" when dealing with a 4-drum car. It seems like the 68 Bronco MC might be the fastest way to go and the fitting sizes on the Bronco MC are the same as the fittings and lines already used on my 56 customline ( can anyone comfirm this?) Also, what is the pain associated with a MC that has the line outlets on the fender side of the MC? I can't quite picture my engine bay well enought to understand what hassle this will cuase versus having the line outlets towards the engine side? I'm hoping to order this today so it comes in tomorrow and I can work on it over the weekend. Thanks!
Nate - Madison, Wisconsin 56 Ford Customline Sedan
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I used a manual master cylinder for a 67 mustang on my 57 fairlane. Bolted right up. The rod from the pedal had to be lengthened 1 1/2 inches. I think there are adjustable rods available. Then replumb the lines. You will get rid of the tee and run the front/rear lines separate to the m/c. A good place for info on these mods is http://www.57fordsforever.com
Buz
Buz Mills
Dallas, TX
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