Banjo bolt size?
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Laughing Gas
Joined: Jul 2013
Posts: 1,211
Likes: 3
From: clovis, CA
Banjo bolt size?
I need to know if anyone knows of the top of their heads the size and pitch of the banjo caliper bolt for a 79 2wd with dual piston calipers. Don't have the bolt with me as I am home and the truck is inn the shop and I am ordering new Stainless steel Braided brake lines. Thanks...Mo
PS: Is it a 7/16" ?
PS: Is it a 7/16" ?
Hotshot
Joined: Apr 2009
Posts: 14,333
Likes: 247
From: Stanley, VA
I need to know if anyone knows of the top of their heads the size and pitch of the banjo caliper bolt for a 79 2wd with dual piston calipers. Don't have the bolt with me as I am home and the truck is inn the shop and I am ordering new Stainless steel Braided brake lines. Thanks...Mo
PS: Is it a 7/16" ?
PS: Is it a 7/16" ?
385116-S2 .. Bolt-National Fine Thread / 3/8" diameter / 24 thread count / 5/8" thread length / Obsolete
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Laughing Gas
Joined: Jul 2013
Posts: 1,211
Likes: 3
From: clovis, CA
Wow 3/8s sounds so small for the DPs. The ones on my 75 Bronco were that size. I swapped in the T-bird big calipers and the size bumped up to 7/16s x 24, i thought they would be at least that size. I am going over and mic them tomorrow. Thanks guys. OK this just in, off a spec site. The 3/8s quoted in not the banjo bolt it is the bleeder size. The banjo is what goes thru the block at the end of the brake hose(known as the banjo) sans the banjo bolt.
Hotshot
Joined: Apr 2009
Posts: 14,333
Likes: 247
From: Stanley, VA
This is the 385116-S2 banjo bolt. The specs are 3/8"-24 NF.
The bleeder screw is C8AZ-2208-A and you're correct, it is also 3/8"-24 thread.
Also, here's the illustration (link below picture) from the Ford parts catalog showing that the banjo bolt used is 385116-S. Look at the top illustration, that shows the front wheel for the F250/350.
If you can't find any locally, there are still quite a few (literally, 100's) available from Ford dealers and obsolete suppliers. Let me know if you want some contact info.
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Laughing Gas
Joined: Jul 2013
Posts: 1,211
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From: clovis, CA
Mike actually someone on the Fanatics site said what's a banjo bolt, as I crossed posted there as well, no disrespect compadre' . I am going over right now and will check against the actual ones as I have new speed bleeders to install as well. Will post later.
Hotshot
Joined: Apr 2009
Posts: 14,333
Likes: 247
From: Stanley, VA
If you have new bleeder screws, a quick check, see if one of them will screw into the fluid port, same thread.
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Laughing Gas
Joined: Jul 2013
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From: clovis, CA
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Laughing Gas
Joined: Jul 2013
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From: clovis, CA
Confirmed they are 3/8". Funny how these huge calipers use a smaller Banjo bolt as compared to the ones on my Early Bronco with Big T-bird calipers, they use 7/26". Well went to my local speed shop (no so local😞
and just had line made.sweged not rebuildable but only $25 whoo Hoo.
and just had line made.sweged not rebuildable but only $25 whoo Hoo.
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Hotshot
Joined: Apr 2009
Posts: 14,333
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From: Stanley, VA
Actually, when you do the calculations, the two piston calipers aren't that much bigger than the single piston calipers.
Single piston diameter = 2.875"
dual piston diameter =2.188" (X2)
single piston surface area= 6.491821875 sq. in.
Dual piston (2) surface area= 7.5199599552 sq. in.
The dual pistons are just slightly over 1 sq. in bigger (+1.02813808 sq. in.) so the dual piston calipers are only about 15.8% bigger than the single piston versions.
Single piston diameter = 2.875"
dual piston diameter =2.188" (X2)
single piston surface area= 6.491821875 sq. in.
Dual piston (2) surface area= 7.5199599552 sq. in.
The dual pistons are just slightly over 1 sq. in bigger (+1.02813808 sq. in.) so the dual piston calipers are only about 15.8% bigger than the single piston versions.
Hotshot
Joined: Feb 2004
Posts: 10,808
Likes: 2,604
From: The Shenandoah Valley
Actually, when you do the calculations, the two piston calipers aren't that much bigger than the single piston calipers.
Single piston diameter = 2.875"
dual piston diameter =2.188" (X2)
single piston surface area= 6.491821875 sq. in.
Dual piston (2) surface area= 7.5199599552 sq. in.
The dual pistons are just slightly over 1 sq. in bigger (+1.02813808 sq. in.) so the dual piston calipers are only about 15.8% bigger than the single piston versions.
Single piston diameter = 2.875"
dual piston diameter =2.188" (X2)
single piston surface area= 6.491821875 sq. in.
Dual piston (2) surface area= 7.5199599552 sq. in.
The dual pistons are just slightly over 1 sq. in bigger (+1.02813808 sq. in.) so the dual piston calipers are only about 15.8% bigger than the single piston versions.
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Laughing Gas
Joined: Jul 2013
Posts: 1,211
Likes: 3
From: clovis, CA
Not getting into a mathematics battle, but 1" is significant. Especially since add to the equation that the brake pad surface area is greater, contacting a larger patch of the rotor. If you were to put the dual pistons on a lighter truck it would send you thru the w/s as they did on my F250 2wd in a panic stop when a paper plate Kia drove in front of me when I first got the truck together. Loosing site of the original flavor of this thread, it that one would think they would just by site, be bigger. Peace 
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