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Stock brakes on an F550 Knuckle?
- Thread starter Jeff K
- Start date
If you already have stock brakes and don't want Wilwood/Spidertrax stuff, what else is there that would be worth a damn to adapt? My 19k pound F550 stops like a sports car with the stock brakes......
What exactly are you trying to do?
What exactly are you trying to do?
Jeff K
Member
- Joined
- Aug 6, 2020
- Member Number
- 2419
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- 19
Sorry, I'm building a tube chassis rock crawler. Front and Rear steer. SD 550 knuckles and C's, 14b center section. I don't need the massive calipers of the 550, and it limits wheel choices. I was looking for something smaller to adapt to the 550 Knuckle.
Look at HYDRODYNAMIC build for ideas on custom brackets
42” reds on dubs clear all brake packages.
Jeff K
Member
- Joined
- Aug 6, 2020
- Member Number
- 2419
- Messages
- 19
I've been told that the 550 calipers will not fit inside a 17" wheel.
dubs aka 20” rims. all the room in the world
Busted Knuckle sells this kit for $699 with 4 piston Wilwood calipers. Even if the caliper bracket doesn't work on the 550 knuckle it wouldn't be hard to make one that does.
bustedknuckleoffroad.com
Edit:
F550 knuckle (my 2019 does anyway) has 4 caliper bracket holes vs the 2 on an F250/350. Going off this picture their bracket and spacing system looks stupid simple to replicate and adapt to the bigger F550 knuckle.
05+ Super Duty Light Weight Brake Rotor Package
FINALLY! A light weight disk brake kit for the super beefy 2005+ super duty axle that is affordable! This kit includes 1.25" wide vented rotors coupled with 4 piston forged wilwood calipers to reduce weight and compromise on cost. Weighing in at only 28lbs you can cut 66lbs off of your stock...
bustedknuckleoffroad.com
Edit:
F550 knuckle (my 2019 does anyway) has 4 caliper bracket holes vs the 2 on an F250/350. Going off this picture their bracket and spacing system looks stupid simple to replicate and adapt to the bigger F550 knuckle.
Dust Buggy
Many of you know me from the HydroDynamic Buggy. Around Thanksgiving 2017 we had some family over and we took the buggy out for some night runs around the ranch. One of the last runs was with my three boys, the 4 and 6 year old sitting in the passenger seat and the 2 year old sitting with me...
irate4x4.com
Post #6
Will Scarlet
The universe is vast...
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- May 20, 2020
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- 766
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- 1,666
Here's post #6 to make it easier:Dust Buggy
Many of you know me from the HydroDynamic Buggy. Around Thanksgiving 2017 we had some family over and we took the buggy out for some night runs around the ranch. One of the last runs was with my three boys, the 4 and 6 year old sitting in the passenger seat and the 2 year old sitting with me...
Post #6
Dust Buggy
Many of you know me from the HydroDynamic Buggy. Around Thanksgiving 2017 we had some family over and we took the buggy out for some night runs around the ranch. One of the last runs was with my three boys, the 4 and 6 year old sitting in the passenger seat and the 2 year old sitting with me...
irate4x4.com
Bebop
Well-known member
- Joined
- May 26, 2020
- Member Number
- 1458
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- 4,860
Busted Knuckle sells this kit for $699 with 4 piston Wilwood calipers. Even if the caliper bracket doesn't work on the 550 knuckle it wouldn't be hard to make one that does.
05+ Super Duty Light Weight Brake Rotor Package
FINALLY! A light weight disk brake kit for the super beefy 2005+ super duty axle that is affordable! This kit includes 1.25" wide vented rotors coupled with 4 piston forged wilwood calipers to reduce weight and compromise on cost. Weighing in at only 28lbs you can cut 66lbs off of your stock...
Edit:
F550 knuckle (my 2019 does anyway) has 4 caliper bracket holes vs the 2 on an F250/350. Going off this picture their bracket and spacing system looks stupid simple to replicate and adapt to the bigger F550 knuckle.
BK has a 550 option already, just gotta call them
Jeff K
Member
- Joined
- Aug 6, 2020
- Member Number
- 2419
- Messages
- 19
This is the post I have been searching for for days. I saw it a while ago but when I needed it I couldn't find it again. Thanks.Here's post #6 to make it easier:
Dust Buggy
Many of you know me from the HydroDynamic Buggy. Around Thanksgiving 2017 we had some family over and we took the buggy out for some night runs around the ranch. One of the last runs was with my three boys, the 4 and 6 year old sitting in the passenger seat and the 2 year old sitting with me...
Will Scarlet
The universe is vast...
- Joined
- May 20, 2020
- Member Number
- 766
- Messages
- 1,666
Don't thank me, thank 06h3 as they're the one who found the post. I only directly linked to what they referenced.
Jeff K
Member
- Joined
- Aug 6, 2020
- Member Number
- 2419
- Messages
- 19
Thanks! This is the bracket I saw that I was looking for. I spent hours searching FB for it. 🙄Dust Buggy
Many of you know me from the HydroDynamic Buggy. Around Thanksgiving 2017 we had some family over and we took the buggy out for some night runs around the ranch. One of the last runs was with my three boys, the 4 and 6 year old sitting in the passenger seat and the 2 year old sitting with me...
Post #6
YotaAtieToo
Thick skull
Won't you be going to standard f250/350 unit bearings anyway?
Then just run the 250/350 brakes?
What am I missing?
Then just run the 250/350 brakes?
What am I missing?
ParadisePWoffrd
Recovering Project Junkie
The f550 knuckle is different than the 250/350 knuckle.Won't you be going to standard f250/350 unit bearings anyway?
Then just run the 250/350 brakes?
What am I missing?
YotaAtieToo
Thick skull
I realize that, but I know it's been done.
Like Grendel mentioned, custom caliper adapter?
Wisconsinite
Red Skull Member
FYI, I have never had anyone excited about the braking performance using the 4 piston wilwood calipers. The housings flex under heavy clamping force. The 6 piston units have a bridge and additional bolts that decrease the housing flex.
arse_sidewards
Red Skull Member
- Joined
- May 19, 2020
- Member Number
- 71
- Messages
- 8,562
Or just use the stock calipers.
No race car has the braking needs of a slightly overloaded SRW wonton being driven in city traffic.
'84 Bronco II
El Chingón
As Grendel mentioned, the '05-'12 F250/350 calipers have a closer bolt spacing than the '13+ F250/350 calipers which might make things easier for you. I could measure the ones on my '07 axle If you like. Please keep us updated with what you end up doing as I am really interested in running stock F250/350 brakes on a 450/550 knuckle
Hydrodynamic's setup isn't bad, but I like the larger diameter of the later Superduty front rotors for manual brake set ups.
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Bebop
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- May 26, 2020
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They have plenty of different versions of that 4 pot.
Dynalite suck. Billet dynapros on the other hand work great.
HYDRODYNAMIC
Rock Stacker
FIFY
Even I forgot what I had to do to make the caliper fit. It wasn't too difficult just took some time, measuring, and fitting.
It was by far the least expensive and dependable solution using OEM parts. I cant remember, but I don't know if the stiffer billet Willwood calipers are wide enough to use a stock vented rotor. I think you would have to drop down to a 3/8" plate rotor.
The other benefit to using the smaller F250 2000 rear wheel calipers and 13"x1.18" rotors, is the front and rear brakes are now balanced which matters when locked in 4x4.
COPY FROM BUILD THREAD
While at KOH I talked with a Willwood rep in depth about buggy brakes.
Many super duty swaps result in larger front caliper piston area than rear.
Some school of thought is you want more breaking in the front than rear so the rear doesn’t lock up and spin around.
Some will put a smaller master cylinder on the front than the rear when running equal calipers front and rear to create higher pressure on the front.
Miller was breaking drivetrain parts at an unreasonable rate.
Analysis was when locked in four wheel all torque was available to all wheels. Braking torque was not equal. The front brakes would brake through the drivetrain to the rear wheels which were underbraked resulting in the drivetrain loading with braking force.
Front and rear rotors and master cylinders were matched and the drivetrain loading was reduced to reasonable levels.
This was the analysis and solution from Willwood, not myself, I just followed their advice.
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