Hey i was curious is it possible to swap to the f250 dual piston calipers and 12.560 rotors. Would the spindle need to be changed too. I seen somewhere that they use different spindles but are the parts interchangeable I see theyre 8 lug which really isnt a problem i can convert the back as well or just run adapters. Going to be putting my grandpas truck back on the road 1980 f100 2wd longbed w/ 302 but that may be getting swapped for something else. and its going to possibly have 33s just trying to get all the braking power i can get.

 

Welcome to FTE.
What wheel bolt pattern is the 100 and is it power brakes or not?

Well I had 2 81 F100's and found out the hard way they used different wheel bolt patterns.
Well being both 100's I was thinking of just a rotor swap well ......... the spindles are different as are the calipers.
You would think OK just swap spindles well ........ the kingpins are different sizes!

So in short of just a rotor & caliper swap I am going to say NOPE WILL NOT WORK!
Now could you swap the beams on out to end up with larger front brakes I dont know?
You would still need to deal with wheel bolt pattern.

Then I would say you would need to do something with the master as I would think the 250 master would be bigger but you could not really use it because you would still have smaller rear wheel cly of the 100.
Cant use the 100 master as its to small for the 250 calipers so what do you do?

Unless you are road racing the truck or carry heavy loads I dont see anything wrong with the factory brakes if kept in good shape.
I think you can get drilled / slotted rotors and different pad compounds to help in stopping may want to look into that.
Let us know what you come up with.
Dave ----

ps I also looked at the F250 2 piston calipers but when told they would not fit the 100 brackets that was as far as I went never thinking of the master.

 

Im pretty sure its the small bolt bolt pattern. The truck is about 400 miles away just trying to get a game plan for when i go get it.
Didn't even think about the kingpin sizes would be different. Was able to pull up i think some of the f250s used a 7/8 kingpin or 1 1/16" king pin i think. At least on this drop beam site they have both available on the f250.
The master cylinder already planned on changing as well because was going to convert to 94-04 mustang brakes in the rear to have disc brakes. Planning on running wheel adapters to convert it to 6 lug chevy/dodge since its lots of used wheel options out there in that size.
I do plan on towing possibly a racecar with it as well a little down the road but currently it'll just be my motorcycle while having 33s on it.
Was looking on another thread and they said the caliper brackets are rare so most likely going to have to scratch the idea and just go with super aggressive pads up front

 

On the F100 the small wheel bolt pattern uses the small kingpins and my truck had power brakes.
The large wheel bolt pattern uses the large kingpins and my truck did not have power brakes.

Thing was with both trucks I found the calipers & wheel cly. had the same area of fluid so used the same masters.
The truck I was building had the large wheel pattern but wanted power brakes so I swapped in the power brake pedal assy., yep they are different between power and no power, booster & master and now have power brakes on my F100 truck.

On the 33's you may want to check if they will clear on a 2wd truck. I think on a 4x4 it is close and they sit higher from the factory to start with.
If the 33's fit what you doing for a rear gear? The truck will be a dog to try moving from a stop and even more so pulling a trailer.
Dave ----

 

Oh okay. I'm going to have to double check and see what all options it has or doesn't cause i definitely want power steering and brakes. But I'm pretty sure it has small bolt pattern and power steering not to sure on the power brakes though.
Found a 4 inch lift for it. 33s and lift going to be last though mainly focused on it driving good and a/c. If it does have a 9 inch my dad has i believe 4.10 or 4.30s from his racecar that i could use but buying new gears wouldn't really be a problem. Going to try to get the engine swapped out and new bushings and just try to refresh the truck before i do the 33s and lift for looks.

This is how I'm trying to get it. I know the style is not for eveyone but i like it. And lowering a 2wd longbed just makes it look even longer to me, so the only way is up lol. Plus i see all types of truck at the track towing stuff don't see any ford trucks older then the 90s want to add a little variety. Wish it was a dentside but I'll take what i can get its my grandpas old truck and one of the first vehicles i drove so would really like to drive it again.

 

There is nothing wrong with a nicely done stock looking truck either and it takes less money to do it LOL

Dave ----

 

Your right aint nothing wrong and its cheaper. But i just can't rock stock lol.

 

I tried to add this to my post above.

Dave ----

 

Yep most people dont realize when it comes to F100s you had a F100 and a F100 HD, the heavy duty version used F150 components. I had came across this on one at work when I ordered parts for a F100 and they werent right ended up using F150 components for the same year.

 

Thats the first I heard of 100 & 100HD.
What is strange in my case both trucks were 81'sand GVWR of 4700, both had 300 six, 9" rear, and stick trans.
The T18 truck had the large pattern, no AC, short bed.
The SRUG had small pattern, AC, long bed.
Dave ----

 

I dont know if Ford ever marketed it as a 100HD thats just what I call them as they use the F150 brake components. It is quite weird how ever though cause you have to know what you have if you are order parts. It cost me about 4 hours of wait time on parts as the first parts sent over wouldnt work.

I dont know if it was done for heavier GVWR or not might have been an option thing sort of like the HD cooling for non air trucks, mine is a GVW 5250 flare side without factory AC but came with the HD radiator The long bed work truck F150 that I did the 5.0 coyote in at work that '82 had the standard cooling radiator that was narrower than mine.

Im hopeful that the HD cooling resulted in the HD coil springs up front cause thats what I am going to get from Eaton are the HD non AC coil springs.

 

Didn't know they had that many differences between the f100s and f150 thought it was just a lower gvwr to save on taxes. Has anybody towed maybe a 5-6k trailer with these trucks how were the brakes?

 

Most if not all states have a law anything over 3000 LB has to have trailer brakes, electric or surge like used on Uhaul trailers.
I would not even think about towing that weight with out 1 axle of a dual axle trailer with out brakes.

I have not towed with my truck yet but my truck is set up for electric brakes and my trailer has them on 1 axle of 2.
I have pulled a 2 car trailer with a 76 E350, 460/C6, and lost the trailer brakes pulling into tolls and its not fun trying to stop all that weight.

Get your truck & trailer set up with brakes it may save your life or others but with both having brakes you will not have any issues.
Dave ----

 

Im sure its a law for it. Idk if our car trailer has trailer brakes or not. But if it does from what you're saying i should be fine. May just limit it to towing the bikes, my dads tahoe or suburban can pull the racecar.

 

If your dads truck and the trailer is setup with brakes then yes.
No trailer brakes then no. Just because he has bone it before does not make it legal.
Have a crash, your fault or not and they find out the trailer brakes did not work and you could loose everything.
If you have the bucks for a race car you got money for trailer brakes or dont go racing!
I hate to be that way but the life you save might be mine or my family.

I have not used my car trailer in 6 years.
My F100 is a back up and I installed a controller as it is the right thing to do.
And yes I will go over my trailer before I need to use it, I know it will need tires because of age of them.
Dave ----