Brake Booster
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Post Fiend
Joined: Jan 2006
Posts: 5,037
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From: Kasson, Minnesota
Brake Booster
OK......Now that I have had the parking brake stuff figured out. Now I have a question about the brake booster. I looking for a booster with Master Cylinder. Again I have a 77 F250 4x4 Highboy with Dual Piston Calipers up front. I've looked at Rock Auto, Napa, and AutoZone. Rock Auto and Autozone gives only 1 and Napa gives 2 different ones with a different diaphram diameter. Don't know yet if I'm setting the truck up with cruise or not. Just wonder what a correct booster with Master cylinder would be. Thanks.
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Joined: Jan 2008
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Skosler, You LUCKED out if it fit without alteration
The 74's and later 79's shared a straight thru push rod.
The early 79's and the 77 don't.
It has a fulcrum style push rod.
I'm surprised you don't recall my 10 or 30 post of these?
although, my suggestion is to just get the smaller 9 1/4" diameter 1977 4x2 F-350 dual diaphram brake booster.
The 74's and later 79's shared a straight thru push rod.
The early 79's and the 77 don't.
It has a fulcrum style push rod.
I'm surprised you don't recall my 10 or 30 post of these?
although, my suggestion is to just get the smaller 9 1/4" diameter 1977 4x2 F-350 dual diaphram brake booster.
Last edited by Mil1ion; Dec 2, 2007 at 04:06 PM.
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Post Fiend
Joined: Jan 2006
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From: Kasson, Minnesota
OK........Now I'm back on this subject again. These are the two from Rock Auto.
1. For an F250 pickup part number 509335 (with M/C)
2. (as Dennis suggested) For an F350 Pickup Part number 503311 (with M/C)
Is there a difference in mounting these to the firewall? (ie. direct bolt to the firewall or bolted to brackets).
I am swapping in a 460, and I'm not using tall valve covers since I have A/C, but would either one bother with motor? And if not, what would the main difference be between the boosters AFA performance?
1. For an F250 pickup part number 509335 (with M/C)
2. (as Dennis suggested) For an F350 Pickup Part number 503311 (with M/C)
Is there a difference in mounting these to the firewall? (ie. direct bolt to the firewall or bolted to brackets).
I am swapping in a 460, and I'm not using tall valve covers since I have A/C, but would either one bother with motor? And if not, what would the main difference be between the boosters AFA performance?
Posting Guru
Joined: Oct 2007
Posts: 2,333
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From: Finksburg, Maryland
I just put one on my early 77 from napa , called over told them I had a 77 F250 4x4 with dual piston calipers and they sent one over, looked exact as original and they didn't ask about different diaphragm diameters.
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Joined: Jan 2008
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There should be any difference Buck
short rod
From 77 to 79 (DJ0001) they will fit.
I recommend to install the fulcrum mount to the booster first then install the whole on the firewall.
short rod
From 77 to 79 (DJ0001) they will fit.
I recommend to install the fulcrum mount to the booster first then install the whole on the firewall.
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Logistics Pro
Joined: Aug 2003
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You want option 2, Buck. For what it's worth, when I did mine, I used the straight through on a 77 cab. I hunted all over the junkyards for the brackets, only to find out later that you can get the same booster for the linkage setup.
Another thing is to watch freeplay. Mine was ever so slightly tight, and my rears locked up on me. I ended up using a 1/8" plate for a spacer, but I don't know now the linkage setup adjusts. Maybe it's better?
Another thing is to watch freeplay. Mine was ever so slightly tight, and my rears locked up on me. I ended up using a 1/8" plate for a spacer, but I don't know now the linkage setup adjusts. Maybe it's better?
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