dual diaphram booster setup
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Cargo Master
Joined: Sep 2003
Posts: 2,110
Likes: 32
From: southwest pa
dual diaphram booster setup
i am looking into using a dual diaphram booster setup on my 75 f250 4x4. from what i think i remember reading, the pedal is different from early body style to late. what booster/mc do i want to use? would i want to use a setup from a 75 f350 2wd? truck has a dual piston d60 and drums in the rear. not sure on the size drums. i read the tech thread and that is for 78-9 broncos and f150s. basically, what do i want to use and what mods(if any) will i need to make to get 1 ton brakes on my truck?
Mountain Pass
Joined: Mar 2008
Posts: 119
Likes: 1
tandem diaphram
I just put one on my 79 F-150. It was a straight bolt in for me. I am also putting a line lock in. I still have to bleed the brakes before I can even try it. I am not sure about the 75's, but I think the numbers you refer to may be the DJ0-001. There are boosters for prior to DJ0-001 and after DJ0-001. If you go to a site such as rockauto or napa and look up the F-350 power brake booster and compare yours to it you may be able to find out what you need.
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Cargo Master
Joined: Sep 2003
Posts: 2,110
Likes: 32
From: southwest pa
i was just looking at a few sites and found what appears to be a dual diaphram booster/mc for 75 f250/350 (same part num.) with dual piston callipers. im hoping this is the part that i need. its 138$ and id like to have the best brakes i can on this truck.
Mountain Pass
Joined: Mar 2008
Posts: 119
Likes: 1
Rockauto
Looks to me, that the part# 503112 would be the one you want if you want the M/C too. If you want to use your old M/C you could get the part# 5473112. Just remember that your core will not be accepted as it is not the same model as you are buying. That makes a $30.00 difference that I know some people overlook. Shop around and ask questions, your supplier should be able to confirm that what you order is properly sized. Also don't forget that the bore of the M/C should not be larger than whatever you presently have as it will affect your braking. I ordered the power brake booster without the M/C and used my old M/C as the F-350 one is 1/16th of an inch bigger bore. In your case I believe the difference is 1/4 inch. The larger bore will move more fluid but deliver less pressure to the brakes if I remember correctly.
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Cargo Master
Joined: Sep 2003
Posts: 2,110
Likes: 32
From: southwest pa
im going to have to do a search on that. thanks for the info. i thught guys were using the f350 booster and mc. right now i have a booster and mc for a 76 f250 4x4 for the disc brake setup.
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Cargo Master
Joined: Sep 2003
Posts: 2,110
Likes: 32
From: southwest pa
just checked out the napa sight. opened a whole new can of worms here. the dual diaphragm boosters 75-79 are the same size, so should give the same amount of assist. the wrench is thrown in with the master cylinders. the f250 with dual piston calipers has a 1.25 inch bore. i have dual pistons on my d60. should i go with this? or.....there is a mc listed for a f250 with single piston calipers with a 1" bore. so, for the best brake performance, am i understanding that i should order the dual diaphram booster, with the mc for a single piston caliper?
Lead Driver
Joined: Mar 2004
Posts: 8,922
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I bought my booster and master for a '79 f350 2wd. Bolted right in to my '79 f250 4x4 & works great.
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Cargo Master
Joined: Sep 2003
Posts: 2,110
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From: southwest pa
ok, just did some more looking and it was the tech article here that says that there are differences in the pedal linkages. from what i can tell, i need to use a 78 f350 booster and mc because of the differences in the linkage and the mc will have a 1 1/16 inch bore. no one on heres done this specifically on a 73 74 75 highboy with a d60? im sure 75f350 will have something to chime in since his truck is similar vintage, just dont know what his brake system mods are.
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Senior User
Joined: Feb 2003
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From: Greenville, NC
I did the swap on a 78 F-150. From what I remember, the 79 is the only year with a different pedal linkage, so you need the Booster/MC from a 78 or down truck (don't remember which exact years have what you need, I used 78 parts.)
Mountain Pass
Joined: Mar 2008
Posts: 119
Likes: 1
pics
If you use the Rockauto.com site you can find the part and click on it and see the actual part. This is very helpful as you can see the actual linkage from the booster and the bolt patterns etc. If you look at the ones they have for a 78 and the ones they have for the 75 you will see two different animals. I would recommend looking closely at the one you have and compare it to the pics available on that site. The applications will be the same no matter who you eventually obtain one from. Also if you use your M/C you would not have to change brake lines or even bleed them. Just my 2 cents.
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Cargo Master
Joined: Sep 2003
Posts: 2,110
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From: southwest pa
at this point, i have a mc for a 76 on the truck because of the discs up front. they werent available on the 75. just checked rockauto and that site is excellent. as far as bleeding the mc goes, a vacuum bleeder makes that a non issue. it works wonderfully. im pretty sure the problem i ran into before is that some of the mc's and boosters have different bolt sizes. i tried bolting up a booster from a 79 3502wd and it just didnt work, flat out. i was going to order a booster/mc combo so i know everythings new. thanks guys.
Mountain Pass
Joined: Feb 2009
Posts: 159
Likes: 1
just checked out the napa sight. opened a whole new can of worms here. the dual diaphragm boosters 75-79 are the same size, so should give the same amount of assist. the wrench is thrown in with the master cylinders. the f250 with dual piston calipers has a 1.25 inch bore. i have dual pistons on my d60. should i go with this? or.....there is a mc listed for a f250 with single piston calipers with a 1" bore. so, for the best brake performance, am i understanding that i should order the dual diaphram booster, with the mc for a single piston caliper?
the smaller masters didnt seem to move the volume required for the big calipers in my beater
Ford Parts Specialist
Joined: Nov 2006
Posts: 88,826
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From: Simi Valley, CA
1973/79 F100/350: There are 22 (!) different brake pedals, 7 different clutch pedals.
You have to use the pedals that match the year(s) and (sometimes) the series of truck the booster was used on.
1968/72 F100/350: There was ONE brake pedal used with/without power brakes.
You have to use the pedals that match the year(s) and (sometimes) the series of truck the booster was used on.
1968/72 F100/350: There was ONE brake pedal used with/without power brakes.
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