Wilwood Brakes for Bronco Raptor

[Ape Factory]

That is SAD about ST. I was there at Sebring when they came over and starting putting these on some cars and guys like my friend bought them then and there and even sent back to have them refurbished. ST I always knew were top notch by far the best Ccm style rotor. I was going through 3-4 sets of iron rotors a year and came close to ST's but stopped tracking mostly in 2020 after getting into it in 2005. I miss it but cost to run 10-15 events and go all over was getting out of hand with consumables, track insurance, maintenance time and finding time to do it all. Tehn got into exotics but driving only on the street became boring and those in that crowd do some dangerous stuff on the street and and should be on the track (we have a very strict speeding law in Florida) so I sold my Italian dream and got away from it all.
I just put put around now in my Braptor...LOL....

I lived in SW Florida for about 15 years and used to track at Homestead, PBIR and Sebring in cars and on bikes. I swore off the track stuff as well for many of the same reasons. I know the Florida street scene pretty well so I know what you're referring to!

ST had a number of issues there at the end, mostly just ramping up production and QC. Delivery times were as long as 14 weeks for like the past three years. I hated dealing with them honestly as it was always a hassle not only for me but the customer. They could never get their act together. With that said, they're OEM for every Koenigsegg since 2004 as well as Singer and a few Astons. I'm hoping one of them buys the tech and runs the company correctly. We'll see.

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[MDrums]

I lived in SW Florida for about 15 years and used to track at Homestead, PBIR and Sebring in cars and on bikes. I swore off the track stuff as well for many of the same reasons. I know the Florida street scene pretty well so I know what you're referring to!

ST had a number of issues there at the end, mostly just ramping up production and QC. Delivery times were as long as 14 weeks for like the past three years. I hated dealing with them honestly as it was always a hassle not only for me but the customer. They could never get their act together. With that said, they're OEM for every Koenigsegg since 2004 as well as Singer and a few Astons. I'm hoping one of them buys the tech and runs the company correctly. We'll see.

Cool... hope so too for ST! I also know some company over seas I believe that is adding some butter layer to Ccm rotors to resurface them and suppose to make the OEM style CCM last longer.... that is all I know from a few posts I saw.
I tracked Sebring all the time and Homestead too, Barber, Rd Atl, ViR..plus Daytona once a year. I was deep in it with PCA, mostly Chin and Super Solo in PBOC plus a bunch of auto crossing too. This was 2005-2019...about 10-15 events a year or more. My friend had a trailer for cars which helped ;-).

 

[TrailDamage]

I looked up the standard Bronco kit and it's not using any spacers to offset the caliper radially. That means it's relying on the caliper for any increase in annulus (swept area) on the rotor face, if there is any. Looking at their parts diagram, the bracket may be cast into the hub, one piece, which would prevent mounting the caliper further out without a whole new hub.

I believe the OEM Braptor front rotors are 342x34 but I could be wrong.

The 2023 F150 Raptor kit uses a 13.38" rotor for the 17" wheels although if using aftermarket 20" wheels, there's another option with larger rotors. https://www.wilwood.com/BrakeKits/B...year=2023&make=Ford&model=F-150&option=Raptor

They are 350x34. Both the front rotors and calipers are take-off from the F-150 and are cross compatible.

 

[Tye]

Another GT3 member here (and heavy rennlist contributor). Also very familiar with ST rotors as I took off my oem PCCB rotors and ran them. I do wish there were more BBK options for the Bronco Raptor, even if it meant having to step up from a 17" to an 18" wheel I would strongly consider doing it for more surface area. I remember at SEMA 2022 Brembo revealed their off-road calipers (xc-1) and I know a lot of trophy trucks are running Brembo setups. But not surprised there are hardly any options for us. I agree, I wish at the least wilwood would use a 2 piece rotor.

 

[vrtical]

No brake expert here, but on my Excursion going from the stock calipers to 6 piston calipers with more clamping force and longer swept area (uses H2 pads) made a HUGE difference in stopping power with the same size rotors.

I dont think these Willwoods have any more pistons than the OEMs so kinda mute.

 

[Ape Factory]

I dont think these Willwoods have any more pistons than the OEMs so kinda mute.

Six per caliper vs two for the OEM caliper which is a sliding block-style instead of horizontally-opposed pistons.

What matters is the swept area, the total area of pad contact with the rotor. A "longer" caliper can have more swept area than a shorter caliper. Pistons are not necessarily any indication of a caliper's pressure capability. Swept area can also increase with the annular, the distance between the outer and inner edge of a rotor. That's the most common way to increase braking potential, all other things being equal, but it isn't the only way to increase the total swept area.

 

[Tye]

Six per caliper vs two for the OEM caliper which is a sliding block-style instead of horizontally-opposed pistons.

What matters is the swept area, the total area of pad contact with the rotor. A "longer" caliper can have more swept area than a shorter caliper. Pistons are not necessarily any indication of a caliper's pressure capability. Swept area can also increase with the annular, the distance between the outer and inner edge of a rotor. That's the most common way to increase braking potential, all other things being equal, but it isn't the only way to increase the total swept area.

Given your connections in the brake world, any chance you can get someone to build us a bbk

 

[Ape Factory]

Given your connections in the brake world, any chance you can get someone to build us a bbk

Possibly. I have an outfit that could likely do two-piece rotors for us that would be relatively affordable in terms of what's available out there now. They wouldn't be Girodisc money and would likely be semi-floating instead of full floating, but the iron rings would be replaceable at a lower cost by the end user (they're easy to swap out). I'll reach out to them and see if there is any interest on their end. I'll post up on the Braptor forum too to gain interest.

The limiting factor is the inside diameter of the wheel along with the fact the caliper bracket is cast into the hub assembly. On a lot of cars, it's bolted on and purposefully designed that way by the engineers so brakes, at a later date, can be upsized. This makes it exceptionally easy to design a spacer and include longer caliper bolts to move the caliper out radially via the aftermarket or if you're the OEM, it's a small, cast and machined-finished part that's easy to make larger. But many of the systems are on cars with 20" wheels (or greater) so there's lots of room not offered by the Raptor. It's a challenge to say the least.

 

[Breptar]

Possibly. I have an outfit that could likely do two-piece rotors for us that would be relatively affordable in terms of what's available out there now. They wouldn't be Girodisc money and would likely be semi-floating instead of full floating, but the iron rings would be replaceable at a lower cost by the end user (they're easy to swap out). I'll reach out to them and see if there is any interest on their end. I'll post up on the Braptor forum too to gain interest.

The limiting factor is the inside diameter of the wheel along with the fact the caliper bracket is cast into the hub assembly. On a lot of cars, it's bolted on and purposefully designed that way by the engineers so brakes, at a later date, can be upsized. This makes it exceptionally easy to design a spacer and include longer caliper bolts to move the caliper out radially via the aftermarket or if you're the OEM, it's a small, cast and machined-finished part that's easy to make larger. But many of the systems are on cars with 20" wheels (or greater) so there's lots of room not offered by the Raptor. It's a challenge to say the least.

Building a kit around a 17” wheel is where it’s starts to get dicey. I had a bbk on my truck and decided to sell it because I wanted to run a 17” wheel. With my bbk I had to run a 20” wheel and traditionally the benchmark is a 17” wheel. Only time a 20” wheel is okay in my book is if you’re running a 42” tire.

 

[Tye]

Possibly. I have an outfit that could likely do two-piece rotors for us that would be relatively affordable in terms of what's available out there now. They wouldn't be Girodisc money and would likely be semi-floating instead of full floating, but the iron rings would be replaceable at a lower cost by the end user (they're easy to swap out). I'll reach out to them and see if there is any interest on their end. I'll post up on the Braptor forum too to gain interest.

The limiting factor is the inside diameter of the wheel along with the fact the caliper bracket is cast into the hub assembly. On a lot of cars, it's bolted on and purposefully designed that way by the engineers so brakes, at a later date, can be upsized. This makes it exceptionally easy to design a spacer and include longer caliper bolts to move the caliper out radially via the aftermarket or if you're the OEM, it's a small, cast and machined-finished part that's easy to make larger. But many of the systems are on cars with 20" wheels (or greater) so there's lots of room not offered by the Raptor. It's a challenge to say the least.

Yea, ford really didn't want these braptors to be modified other than bolt on accessories. Is there a reason we couldn't get full floating, I wouldn't care if it's Girodisc money, that's a bargain compared to ST rotors lol.

 

[Ape Factory]

Yea, ford really didn't want these braptors to be modified other than bolt on accessories. Is there a reason we couldn't get full floating, I wouldn't care if it's Girodisc money, that's a bargain compared to ST rotors lol.

Semi-floating is just easier, less expensive and it accounts for thermal expansion in at least one direction. For the intended use, full floating would be massively overkill and you'd never know the difference between the two. I can certainly ask but everything they produce now is semi-floating so it'd require different hardware and there may be issues with offset and caliper positioning. Semi-floating has the hat making more contact with the disc so thermal transfer is higher too.

Honestly, if we did two-piece rotors with rings that had a higher friction coefficient along with better pads, we'd be 80% of the way there. It'd be nice to have more swept area though, especially for those who have increased the hp output.

 

[Tye]

Semi-floating is just easier, less expensive and it accounts for thermal expansion in at least one direction. For the intended use, full floating would be massively overkill and you'd never know the difference between the two. I can certainly ask but everything they produce now is semi-floating so it'd require different hardware and there may be issues with offset and caliper positioning. Semi-floating has the hat making more contact with the disc so thermal transfer is higher too.

Honestly, if we did two-piece rotors with rings that had a higher friction coefficient along with better pads, we'd be 80% of the way there. It'd be nice to have more swept area though, especially for those who have increased the hp output.

yes I wish we could find a way to get more swept area

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