GT500 vs GT braking system - Mustang Evolution

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Old 02-25-2015, 10:04 PM   #1
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GT500 vs GT braking system

I test drive a GT500 with 16,000 miles. Aside from the power, the stopping power really surprised me. The brakes really grabbed after barely an inch of pedal travel. Compared to my GT with 60,000 miles and brembos, I have to press down much farther before my brakes really grab. I desire the GT500 stopping performance in my GT and I was wondering what I need to do to get it. Brake booster? Different master cylinder? New pads and rotors? I know the GT500 has 6 pistons compared to my 4 but does that really prevent me from getting close to this stopping power? Any help is appreciated. Thanks!


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Old 02-25-2015, 10:58 PM   #2
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Have you changed your break fluid during those 60,000 miles? You could possibly have air in your system.


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Old 02-26-2015, 02:31 AM   #3
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I would try the fluid, along with stainless steel brake lines, and some aggressive brake pads. That should be getting close. Downside is you will get more brake dust.
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Old 02-26-2015, 05:00 AM   #4
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Tires have as much to do with braking as does the brakes.
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Old 02-26-2015, 07:04 AM   #5
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I have actually just changed my brakes fluid and upgraded to stainless steel lines. The difference was actually disappointing. I was expecting a lot more firm pedal feel. Could this mean and old booster/cylinder? Or a lot of air?


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Old 02-26-2015, 09:41 AM   #6
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I don’t have any first hand experience with the 6 piston/GT500 set up ... But sounds like your pads/rotors are getting a bit tired after 60,000 miles of service. I replaced my stock (non-Brembo)GT brakes with the Ford racing kit: M-2300-S and went from a 235 wide tire to a 255 for improved stopping. Since you already have the 4 piston Brembo setup, here's the FRPP replacement part numbers for your notes.
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Old 02-26-2015, 11:09 AM   #7
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I have also driven a 2013 GT500 and although the power was the thing that impressed me along with the traction control system (as Grabber Blue5.0 mentioned) it has some of the stickiest tires around, the Goodyear Eagle G:2, and with 265x40's in the front and 285x20's out back. Although it had better stopping power I didn't think it was that much better than my TrakPak GT.
I thought they used a higher boiling point brake fluid also like a Super DOT4. They also have 15" rotors out front and 14" in the rear compared to 14"/12" for the Brembo GT. Although weight distribution could come into the equation, the GT500 has a 56/44 compared to a GT's at 54/46. Personally I would believe going to the 15" fronts and 14" rears with some aggressive pads would give you close to the same feel although I'm not sure what kind of adjustable struts/shocks you've got which would also help some....IMHO
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Old 02-26-2015, 12:07 PM   #8
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Quote:
Originally Posted by Mustang Coyote View Post
I have actually just changed my brakes fluid and upgraded to stainless steel lines. The difference was actually disappointing. I was expecting a lot more firm pedal feel. Could this mean and old booster/cylinder? Or a lot of air?


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I doubt it's the booster or air if you bleed it properly. The Brembo pads on my track pack always feel a little green with slightly more pedal effort on the first stop or two. I think Performance Friction made the pads for Ford in the 4 pot Brembos and I'm sure the pads are different in the GT500. Hopefully you're just sensitive to brake feel and don't have something more serious going on
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Old 02-26-2015, 02:52 PM   #9
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Quote:
Originally Posted by Mustang Coyote View Post
I have actually just changed my brakes fluid and upgraded to stainless steel lines. The difference was actually disappointing. I was expecting a lot more firm pedal feel. Could this mean and old booster/cylinder? Or a lot of air?


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I would have expected more also, especially after going with SS lines. Did you just go with SS lines in front or all four? When the fluid was drained how did it look, any water in the system?
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Old 02-26-2015, 05:09 PM   #10
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Thank you all for the informative replies. To give you guys more info, I upgraded to all four SS lines. Before a complete flush - done by mechanic - the fluid was jet black. Afterwards it's more yellow but you can still easily see black in the reservoir. I have 255/35 up front and 285/30 in rear. I'm wondering if the ABS system could have trapped air/bad fluid? I've most definitely activated it multiple times before this flush and change out. The thing about the GT500 test drive was that the pedal seemed to grab so high up as opposed to mine farther down. It was so different than my GT that I wasn't used to it even toward the end of the test drive (I was still braking too hard). Thanks again!


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