f100 disc swap, wheel problem

emeraldcoupe · Post by **emeraldcoupe** » Wed Oct 23, 2019 2:15 pm

so I have a disc set up from a 78 on my 71 and I have factory 80's ford wagon wheels. was doing a little mock up today and the hold down bolt that holds the caliper rubs the wheel , the caliper clears fine. i'm probably going to shave down the bolt a little and see if I can get the clearance I need, as these are my favorite factory wheel. anyone else run into this issue?

sargentrs · Post by **sargentrs** » Wed Oct 23, 2019 3:51 pm

Looks like a backspacing/offset issue. If those wheels had another 1/2" of backspacing they would work. While I don't necessarily recommend it, a 1/4"-1/2" wheel spacer would do the trick. Also, a 1/4"-1/2" shorter bolt would accomplish the same thing. Speaking of the bolt. it doesn't look like it's screwed in all the way or is it supposed to sit like that?

basketcase0302 · Post by **basketcase0302** » Wed Oct 23, 2019 5:59 pm

They tighten up like that Randy.
There's an oval shaped shoulder on that bolt that seats before the bolt bottoms out.

I never knew Ford produced the wagon wheel for it's trucks from the factory?

sargentrs · Post by **sargentrs** » Wed Oct 23, 2019 7:08 pm

Thanks, Jeff! Good to know when I get ready to install calipers on mine. I wouldn't been scratching my head for hours.

emeraldcoupe · Post by **emeraldcoupe** » Wed Oct 23, 2019 8:02 pm

I think i'm going to grind a little off the bolt head, I only need a little more than about a 1/16"

cep62 · Post by **cep62** » Wed Oct 23, 2019 8:39 pm

You might also try a Allen head bolt.

emeraldcoupe · Post by **emeraldcoupe** » Thu Oct 24, 2019 8:53 am

cep62 wrote:You might also try a Allen head bolt.

can't, the head is tapered, special bolt

Post by **DuckRyder** » Thu Oct 24, 2019 9:40 am

I’ll have to look at mine with stock wheels, don’t think it is that close.

Agree shaving the head should work as would a thin spacer....

generalee · Post by **generalee** » Sun Nov 10, 2019 9:03 pm

Well ain't that something. I've been piddling on a disc brake conversion on my 68' using front components off of a 77'. Bought a set of those wagon wheels a couple years ago and never thought there would be a clearance issue. Guess I'll have to get on wth it and see what I got.

greyscar · Post by **greyscar** » Thu Nov 21, 2019 2:26 am

Didn't Ford Have Different Size Caliper setups according to Vehicle Weight Rating, Big and Small?

basketcase0302 · Post by **basketcase0302** » Thu Nov 21, 2019 6:54 pm

"greyscar"Didn't Ford Have Different Size Caliper setups according to Vehicle Weight Rating, Big and Small?

Yes but the most major difference I know of is from F-100/F-150 to F-250 & F-350. I remember some of the 3/4 tons using a dual piston caliper, (versus a single piston caliper). But most if not all the guys here will be using a dent era 73-79 single piston caliper donor truck.
But very good point as the dual caliper is probably much larger making the wheel options less.

http://www.fordification.com/tech/discbrakes01.htm

emeraldcoupe · Post by **emeraldcoupe** » Fri Nov 22, 2019 7:13 pm

so I was digging through some boxes in the garage and I found the solution in one of them. a few years ago I had a 78 f150 and got a few boxes with misc parts in them. anyway, there were these caliper bolts. they fit perfect and give the clearance I needed. bad thing is I don't know the brand, the bag was faded, but I think they were dorman.

Post by **DuckRyder** » Fri Nov 22, 2019 7:17 pm

IMO thats a low stress part, all it does is keep the wedge from the spring from coming out.

I wouldn’t worry too much about them, if it makes you feel any better set a reminder to have a look at them occasionally...

emeraldcoupe · Post by **emeraldcoupe** » Wed Nov 27, 2019 9:53 am

DuckRyder wrote:IMO thats a low stress part, all it does is keep the wedge from the spring from coming out.

I wouldn’t worry too much about them, if it makes you feel any better set a reminder to have a look at them occasionally...

not worried about them at all, they are caliper bolts just made with a low profile.

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