Dual master cylinder
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Laughing Gas
Joined: Sep 2008
Posts: 966
Likes: 27
From: Missouri
Dual master cylinder
If I put a dual master cylinder on my 53, do I need a check valve? I talked with a guy at my area car show who had a 54. He put on front disk brakes with a dual master without power booster. He said he had to put a check valve in to prevent the fluid from running back into the master cylinder. I believe he said he was using a master cylinder for a mustang. Does this make a difference from orderin a dual cylinder specifically for our old trucks?
Lead Driver
Joined: Apr 2002
Posts: 8,813
Likes: 13
From: Littleton, New Hampshire
If it's mounted under the flloor you do need a residual check valve. You can get by without it most of the time if it's mounted on the firewall. If you have disc/drum brakes you need a MC designed for disc/drums. If you don't you need one designed for drum/drum. What do you have on your truck? 
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Laughing Gas
Joined: Sep 2008
Posts: 966
Likes: 27
From: Missouri
Right now it is drum/drum with master cylinder under the floor. Right now I do not have the funds to change to disc/drum. So I was looking at least put a dual master for safety until I have the funds to switch. When I go to disc/drum should I put a power booster?
Lead Driver
Joined: Apr 2002
Posts: 8,813
Likes: 13
From: Littleton, New Hampshire
If the MC you are using now is for drum/drum you may not need the inline residual valve since the MC should have 10 lb residual valves built in. If it is made for disc/drum and you are using it for drum/drum you will need one for the front but probably not for the rear. A power booster is not necessary unless you just prefer power brakes. I have used a manual under the floor MC and it worked fine. Also, non-power MCs are not the same bore as power MCs so you should not add a booster unless you have the right MC. Alternatively, if you try to use a power MC without a booster you may not have enough pedal pressure.
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Laughing Gas
Joined: Sep 2008
Posts: 966
Likes: 27
From: Missouri
Dual master cylinder
I have not looked yet, but I am sure the one on my truck now is the stock single bowl master. That is why I am looking to put a dual master on it. I will eventually put disc on it. Are you sayin I can use a dual master for disc/drum with my drum/drum? That would be great because all I would have to do is but the disc conversion kit at a later date. Will I need the proportioning valve with the dual master on drum/drum?
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Former Vendor
Joined: Oct 2008
Posts: 189
Likes: 0
We go a MC w/o booster for drum/drum and one for disc front/drum rear with the proportional valve installed.
With ours you need a 10lb check valve in the front and rear for the drum/drum
and a 2lb valve in the front and a 10lb valve in the rear for disc front/drum rear
With ours you need a 10lb check valve in the front and rear for the drum/drum
and a 2lb valve in the front and a 10lb valve in the rear for disc front/drum rear
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Ford Parts Specialist
Joined: Nov 2006
Posts: 88,826
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From: Simi Valley, CA
If the MC you are using now is for drum/drum you may not need the inline residual valve since the MC should have 10 lb residual valves built in. If it is made for disc/drum and you are using it for drum/drum you will need one for the front but probably not for the rear. A power booster is not necessary unless you just prefer power brakes. I have used a manual under the floor MC and it worked fine. Also, non-power MCs are not the same bore as power MCs so you should not add a booster unless you have the right MC. Alternatively, if you try to use a power MC without a booster you may not have enough pedal pressure.
When Ford first installed them in 1967 on cars and trucks, all these vehicles came with a (Brake Differential) Proportioning Valve.
These valves, in most cases, were mounted inboard of the left front wheel on the outside of the frame rail. Some were mounted adjacent to the steering gearbox.
On 1967 Mustangs only, the valve is mounted adjacent to the rear axle.
There were different types used for drum/drum and disc/drum brakes.
Elder User
Joined: Jan 2004
Posts: 739
Likes: 1
From: Murfreesboro, TN
Does anyone know of a dual master that will "bolt" in, instead of the stock single bowl on a 53 F100? I was never able to find one that didn't need a bracket to adapt.
The stock bolts "from the side" and all the duals that I could find bolt "from the front"....
The stock bolts "from the side" and all the duals that I could find bolt "from the front"....
Posting Guru
Joined: Apr 2004
Posts: 1,908
Likes: 2
From: Seattle WA.
Does it make a difference which side of the adjustable valve the Residual valve is installed on. Your diagram shows it on the wheel side I have mine mounted on the MC side. Also I was told the adjustable units were against the law for street use does anyone know if that is true.
Former Vendor
Joined: Oct 2008
Posts: 189
Likes: 0
The dual master, no booster, for both drums is part 5914 and is $89
The dual master, no booster, for front disc/rear drum is part 5913 and is $189
The check valve, 10lb or 2lb are $25.95 each, in red or blue, polished ss is $29.95
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