PP1 VS BASE GT BRAKES...

[Flyhalf]

The issue of the 4 piston system isn't the pistons it is the rotor. The rotors are reverse in the 4piston making almost impossible to cool down.
So 6piston is better because u get better cooling. and the rotors are bigger.
Technically u need a new master cylinder. (6piston)
Then hawk ..what hawk? Some are great some are really bad.
Whatever u decide upgrade the fluid to dot 4
Ps.
More pistons Doesn't mean more braking power.

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[2morrow]

The issue of the 4 piston system isn't the pistons it is the rotor. The rotors are reverse in the 4piston making almost impossible to cool down.
So 6piston is better because u get better cooling. and the rotors are bigger.
Technically u need a new master cylinder. (6piston)
Then hawk ..what hawk? Some are great some are really bad.
Whatever u decide upgrade the fluid to dot 4
Ps.
More pistons Doesn't mean more braking power.

^^^ Ding ding!

As others have said yes there is a belly pan but all that is nothing without a proper functioning rotor.

 

[ice445]

^^^ Ding ding!

As others have said yes there is a belly pan but all that is nothing without a proper functioning rotor.

Luckily it seems Ford has corrected the silly rotor design on the base brakes, although I'm unsure of what else may have been changed in the splash/underbody tray area.

 

[Hack]

90% of the feel is due to the 2 piece rotors.

I don't know about that. My assumption is it was the construction of the front calipers "monoblock" how they are a single piece and they mount directly onto the front upright (spindle) rather than being mounted on sliders.

The rotors are nice because they weigh less and are less likely to warp from heat compared to 1 piece iron rotors, but that contributes more to steering feel, I believe. On the street I don't think the rotors do anything for you. I think it's the front calipers that give you the amazing immediacy (if that's a word) and great modulation/feel. The GT350 brakes have very little slop in them. When you step on the pedal they are working much faster than typical brakes do.

let's just say after doing a pull, im having to pump my brake pedal because if im holding it, you can feel them getting getting cooked. I hear a groaning noise but no steering wheel shake. theres been a couple of close calls where I do have to pump the brakes because holding them feels like i wont be able to stop. i don't smell brake pads but I know for sure I'm creating heat spots. even at the 1/8 mile after finishing the run, i still have to pump. i know I probably should just do fluid, pads, and rotors but I feel like I would have more confidence with a larger brake surface area and pads. I'm probably overthinking this brake situation...

Yes I think you are 100% right. Start with replacing the fluid at least. If the pads and rotors are in good condition, see what the fluid alone does for you. It's cheap and quick to do. Pumping the brakes can only help with the availability of brake pressure at the wheels. It won't do anything as far as heat goes. I use Motul RBF 600, but there are many good fluid choices. You might consider just replacing with fresh stock brake fluid, as it absorbs moisture more slowly than the high temperature fluids. If you go to a high temperature fluid, you are locked into more frequent future fluid changes.

 

[K4fxd]

I'm probably overthinking this brake situation...

Your cheapest way to fix this is to go to a dealer and get some 2023 rotors. Get the dust shields too if you don't want to cut an opening for cooling air in your current shields. This will solve most if not all of your issues.
Make sure the opening for cooling air is on the back side of the rotor.
If cost is not an issue go with 2 piece rotors for the 4 pots along with creating an opening for air in the dust shield. This will save you weight over the stock rotors (about 20 Lbs) and 35 to 40 Lbs over the 6 pots. Price will be similar.

I don't know about that. My assumption is it was the construction of the front calipers "monoblock" how they are a single piece and they mount directly onto the front upright (spindle) rather than being mounted on sliders.

The 2 piece rotors are free floating and isolate the rotor from the chassis. This makes a much smoother brake feel even in street applications. The 350 might have upgraded hoses which will also make a better feeling pedal.

 

[Hack]

The 2 piece rotors are free floating and isolate the rotor from the chassis.

The rotors are multiple pieces, but the inner and outer parts are rigidly connected together. They don't float. There is a provision for the iron ring of the rotor to expand with heat, but there's nothing free floating there.

The 350 might have upgraded hoses which will also make a better feeling pedal.

The monoblock calipers that are mounted directly to the spindles improve the pedal because they are exceptionally rigid. It's possible the hoses are upgraded, but I would be surprised. I haven't seen any Ford marketing lit that talks about upgraded hoses, and I'm sure they would mention it if they had done something.

 

[K4fxd]

The rotors are multiple pieces, but the inner and outer parts are rigidly connected together.

I haven't looked at the 350 rotors but my rotors free float.

The monoblock calipers that are mounted directly to the spindles improve the pedal because they are exceptionally rigid.

The 4 pot calipers are mounted to the spindles, there are no sliders. I believe the 6 pots are too. The rear caliper has sliders.

 

[Hack]

I haven't looked at the 350 rotors but my rotors free float.

What kind of rotors are these?

The 4 pot calipers are mounted to the spindles, there are no sliders. I believe the 6 pots are too. The rear caliper has sliders.

Yes that's right. The mounting scheme is different, which I assume is part of the improved function of the GT350 brakes. The base 4 piston and GT PP1 calipers have ears that extend out from one side and the bolts are parallel to the spindle.

The GT350 monoblock bolts are at 90 degrees to the spindle. My assumption is this non-traditional setup is partially responsible for the improved feel.

 

[K4fxd]

What kind of rotors are these

Steeda, I verified they were full floating with tech before I bought them.

 

[K4fxd]

The GT350 monoblock bolts are at 90 degrees to the spindle. My assumption is this non-traditional setup is partially responsible for the improved feel.

It all adds up, I still think what you are feeling is 90% the rotors.

 

[2morrow]

With all this brake talk I had to post a pic of my reworked brakes. New calipers all around, 2 piece rotor replacements in front (same in rear), new fluid and still using hawk track orientated pads. There’s also a FTB kit there that I’ll finish next weekend(ran outta time).

 

[Bman5150]

The 23 4 pot rotors are properly cooled so all you would need to do is get a set of 23 4 pot rotors and cut an opening in the rock guard for better cooling. Adding a cooling duct will make this almost as good as the 6 pots.

If you do the 6 pots you will still need to add a cooling duct if you track with any speed.

I’ve got a ‘23 GT Premium. What changed for MY 2023 with the base 4 piston calipers (as compared to the front calipers on 2018-2022 MY GTs)?

 

[K4fxd]

The calipers stayed the same but the rotors are now cooled from the inside.

 

[MAGS1]

I’ve got a ‘23 GT Premium. What changed for MY 2023 with the base 4 piston calipers (as compared to the front calipers on 2018-2022 MY GTs)?

The rotor design changed sometime in 2021 (to the way it should be)

https://www.mustang6g.com/forums/threads/base-gt-brake-rotor-revision-vents-on-the-inside.171875/

 

[1958cyclist]

One thing I've heard mentioned only briefly in this thread is brake system cooling. Ford basically copied a Porsche design when they incorporated twin air ramps into the PP1 front splitter. These work in combination with deflector plates which are attached the one of the control arms. Vorshlag makes a larger deflector plate which they tested against the traditional air duct tubes, and found that in side be side testing, the ramps and stock deflectors cooled the front rotors by 10 degrees cooler that the duct tubes. So yes, the front splitters are unique to at least the PP1 package, along with the Brembo calipers and larger rotors.

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