4th Gen GT350 Front Brake Upgrade

[SemperTim]

I've put out in the EB Performance forum and on the 2010+ SHO performance group on FB regarding upgrading the front brakes. I've finalized the design today and looking to start production. Looking at 25 sets initially unless a bunch of people want them.

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15.5" GT 350 front brakes with Brembo 6-piston calipers (piston sizing is around 12% smaller than stock, so a mild increase in pedal effort). Rotors are 2-piece from Ford, or aftermarket 1pc are a bit less expensive (but much heavier). 20" wheels at a minimum. Stock wheels will require a spacer (15mm for the 10-12 20") and likely need the weights positioned as far out as possible.

Calipers I've found for around $150-200, rotors in the same range of cost, pads are $75, and will require the Goodridge hoses. I have a local Brake-quip dealer who makes hoses as well if people are interested. Total cost in the $1200 range for a ridiculous brake upgrade. I have a couple sets of calipers and rotors

Looking at initial cost of $475 shipped for:
2x 6061-T6 AL adapter brackets
4x caliper bolts
4x adapter bracket bolts
2x rotor spacers/centering rings
2x banjo bolts w/ washers

Please post here if interested. I don't check this much. Or go on the FB page.

I have GT350 rear components, but currently lack the time to really dive into it, so I have no estimate on those getting done. Also, I might design for the 15" Mustang brakes (pads work in the GT350 calipers), but those require a much thicker brake housing spacer to clear the ball joint/control arm. CUrrently not in the works, but if interest is high for them (aftermarket racing rotors are more abundant in that size) I can get a rotor and start cracking.

 

[Nova]

Definitely interested

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[SemperTim]

I have 10 sets being made right now, so about 2 weeks until they are in hand. I will be installing on my own car before I offer to the masses to ensure fitment and correct function.

 

[Ecoboost_xsport]

@aaron240 already sells these for the platform, except in Wilwood.

 

[SemperTim]

@aaron240 already sells these for the platform, except in Wilwood.

So they don’t sell these, ok.

Only similarity is a 6 piston caliper.

You can build this whole setup for about the cost of just the Wilwood caliper upgrade.

15.5” vs 13.8”

You don’t like options and made an absolutely pointless post.


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[aaron240]

My brake option was the wilwood superlight4 (4) piston calipers, pads, and stainless braded lines on the oem 13.8" rotor, however i did make a one off set for myself with the 15" rotor and 6 piston calipers. Wilwood's brake engineer advised that with the weight of our car vs the cost of more pistons in the calipers and cost of larger rotors, the performance gains would be marginal. My setup did eliminate about 10lbs per side, 20lbs total when compared to the oem 13+ calipers, any data on weight savings with the mustang brembos? More options for the SHO platform is always a plus and i hope your setup works out.

 

[SemperTim]

Piston count doesn’t really matter, only piston area. The Aero 6 offers a pretty much equal to stock 5.4” piston area while the 4 piston (both Aero and SL) offer a 4.8”. That 4.8” is around 10% smaller area than stock which will offer a firmer pedal, which is kinda needed on our cars especially the 10-12 (10% also being the rough change in master cylinder piston area for the 13+). The GT350 is sized to about a 4.75” piston area, so pretty much like the Wilwood 4 piston option.

I’m very curious if the 13-14 GT500 rotors can work with the S550 PP Brembo pads as that might help with some fitment issues I’ve had regarding ball joint to rotor clearance and open up more 20” wheel options. The S550 15” rotors are too deep. The 15.5” rotor on the GT350 does limit wheel options a bit. I can get stock ones to work, but they require the weights to be moved as far out as possible and at least a 15mm spacer.


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[802SHO]

I was waiting on this. Responded to a FB post that I was interested. I think that was over 4 months ago, maybe? Anyway, I took the spring sale with Rotora. Hope to hear some good reviews about these 350 brakes though. They look fantastic

 

[SemperTim]

I was waiting on this. Responded to a FB post that I was interested. I think that was over 4 months ago, maybe? Anyway, I took the spring sale with Rotora. Hope to hear some good reviews about these 350 brakes though. They look fantastic

Yeah, sorry. This isn’t my day job, unfortunately. I was excited when I saw the Rotora brakes until I saw the cost. Very reminiscent of KSport.

Currently looking at completion and arriving to my house early next week. I’ll test fit on my bench with my test parts. Likely get the brakes on the following weekend or maybe Monday, depending when I have time off. I’ll let everyone know once I’m comfortable.


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[Nova]

Yeah, sorry. This isn’t my day job, unfortunately. I was excited when I saw the Rotora brakes until I saw the cost. Very reminiscent of KSport.

Currently looking at completion and arriving to my house early next week. I’ll test fit on my bench with my test parts. Likely get the brakes on the following weekend or maybe Monday, depending when I have time off. I’ll let everyone know once I’m comfortable.


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So correct me if I'm wrong. To use your kit, do I need to get GT350 calipers and PP GT rotors?

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[SemperTim]

So correct me if I'm wrong. To use your kit, do I need to get GT350 calipers and PP GT rotors?

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GT350 calipers and rotors. There are aftermarket 1 piece rotors if someone is trying to save a few bucks. I haven’t searched in a few months, I’ll look at where I got my parts. Calipers were under $200 a piece, rotors were around the same price, and pads are very inexpensive as well. Hoses are simply the stock Taurus Goodridge ones or I’ve been thinking of having my local brakequip dealer make a run if that’s something that interests the masses.

If people want to go crazy, there’s a Carbon ceramic rotor and pad kit for around $10k….


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[Nova]

GT350 calipers and rotors. There are aftermarket 1 piece rotors if someone is trying to save a few bucks. I haven’t searched in a few months, I’ll look at where I got my parts. Calipers were under $200 a piece, rotors were around the same price, and pads are very inexpensive as well. Hoses are simply the stock Taurus Goodridge ones or I’ve been thinking of having my local brakequip dealer make a run if that’s something that interests the masses.

If people want to go crazy, there’s a Carbon ceramic rotor and pad kit for around $10k….


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Oh ok I thought I read that you were using regular GT PP rotors

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[SemperTim]

Oh ok I thought I read that you were using regular GT PP rotors

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I tried, but I already needed a 3mm spacer behind the bearing for the GT350 rotor and the PP rotors were another ~6mm deeper and I couldn’t justify that much of a spacer. The bearing ends up outside of the spindle at that point, so all the force is taken by the 4 bolts. Not ideal.


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[Nova]

I tried, but I already needed a 3mm spacer behind the bearing for the GT350 rotor and the PP rotors were another ~6mm deeper and I couldn’t justify that much of a spacer. The bearing ends up outside of the spindle at that point, so all the force is taken by the 4 bolts. Not ideal.


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Ok, I just wanted to make sure I understood which parts to buy for this kit.

Thank you

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[SemperTim]

Quick update:

I realized that spacing the bearing housing out will cause the ABS sensor to be too far away and likely cause a fault. I designed some rotor spacers that have the centering ring integrated, so likely have those made up as well.

Also, went to test fit one if the 10 brackets and realized I left both the rotor spacer and bearing spacer on which placed it 3mm off. Once the new ones get in I will make a new post.


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[SemperTim]

So, I truly finalized a couple things. Mainly the rotor spacing. It's a happy accident that the brackets were made with an additional 3mm, because it places the rotor about 5mm from the balljoint. That should be enough of an air gap to keep the heat away. Also, if someone wants to shield the ball joint, that's enough space as well. I drew up rotor spacers with integrated centering hub for this purpose. THe centering hub will also neck down to the 63.3mm of the wheel pilot on the hub to ensure maximum support. There is still 7-8mm left on the wheel pilot for good engagement and support so the studs aren't taking it all.

The 2010-12 split 5 spoke wheels will work with a 16+mm spacer. I'm currently waiting on a test fitment with the "flower" wheels.

 

[Rerun]

These still on track? Very interested in this kit.

 

[SemperTim]

These still on track? Very interested in this kit.

Yes. The rotor spacers are on their way to me. I’ll be installing on my car prior to opening to the masses to ensure everything works correctly. I’ll make a post in the classified section and make a “how-to” based off my install. Pretty straight forward, though: remove, clean, install, bleed. No modification, even on the 10-12 spindle (surprisingly).


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[SemperTim]

Test week is done and these are quite nice. Very linear from triple digit speeds and the brakes are more responsive to pedal pressure Vice pedal travel. Still an easy pedal compared to some cars I’ve done for the track.

Only problem I’m running into are hoses. The Goodridge ones will not work on the caliper due to the fitting design with the hardline. I thought the end was a straight banjo since that’s what it shows in the pictures. Also, brakequip does not make a chassis fitting that works. I tried one and it won’t fit the bracket. The only one they have of the same outside design has the wrong seat for the tube. I’ve ordered a GT350 hose since the MagnaRide equipped looks to have the same chassis fitting. Regular mustang is different and also a different thread. Once that is figured out I will find equivalent aftermarket stainless lines to compile part #s.

Slowly getting this ready for market, but really need to make sure this is correct.


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[SemperTim]

Like everything in my life, things take much longer than I hope. I've been running these brakes for about a month and absolutely love them. Brake feel is much better and the modulation is great: braking for is based on pressure vs pedal travel like the OEM were. I'm running Powerstop Z26 pads and OEM Ford on the rest. I have my local hose guy making a run of hoses. I will make a new post with all the information about this swap and the mounting Kit I will have available once the hoses come in.