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Anyone running 14" brakes rotors? #1638551
06/26/14 02:35 AM
06/26/14 02:35 AM
Joined: May 2008
Posts: 5,399
Aurora, Colorado
451Mopar Offline OP
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Curious if anyone is running 14" brake rotors and how they worked out for wheel sizing and feel.
Whos kit and price would be nice too..

I have been looking at the Bear 14" with the 6P calipers, but they are $2,400+ each end.

Re: Anyone running 14" brakes rotors? [Re: 451Mopar] #1638552
06/26/14 02:42 AM
06/26/14 02:42 AM
Joined: Dec 2010
Posts: 12,375
SoCal
MuuMuu101 Offline
I got lucky at Woodward!
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SoCal
Oz and Feets made their own from Mercedes rotors and Calipers. I believe 72Swinger used an AndyF kit or made his own utilizing Viper calipers. From my reading, 18" wheels are a tight fit and may require the outside edge of the rotors to be turned down to bring the calipers in a little.

Re: Anyone running 14" brakes rotors? [Re: MuuMuu101] #1638553
06/26/14 07:29 AM
06/26/14 07:29 AM
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Long Island, NY USA
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BergmanAutoCraft Offline
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I run an srt rotor and viper gen 3 caliper with a bracket Dr diff had at one time. It's a killer setup with a hydroboost and 11.75 rear discs.

Re: Anyone running 14" brakes rotors? [Re: BergmanAutoCraft] #1638554
06/26/14 09:33 AM
06/26/14 09:33 AM
Joined: Oct 2003
Posts: 21,345
Marysville, O-H-I-O
70Cuda383 Offline
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I have 14" brakes off the front end of the gen 3 & 4 vipers. 4-piston brembos and 14" rotors. Brakes feel great, stops NOW and inspires confidence in your ability to stop short when needed. Pedal modulation to avoid lock-up is easy. Snd despite efforts to heat them up with repeated hard stops, I've not experienced brake fade yet.

Wheel size, I doubt you could fit 17" wheels over these, never tried myself though. 18" is probably the safe minimum diameter.

I wouldn't go bigger than 14" rotors unless I bought super expensive aluminum hubs with bolt on rotor surface area to reduce weight. These stock viper rotors weigh around 30lbs each.


**Photobucket sucks**
Re: Anyone running 14" brakes rotors? [Re: BergmanAutoCraft] #1638555
06/26/14 09:57 AM
06/26/14 09:57 AM
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Posts: 723
Houston Tx
Uhcoog1 Offline
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Quote:

I run an srt rotor and viper gen 3 caliper with a bracket Dr diff had at one time. It's a killer setup with a hydroboost and 11.75 rear discs.




I have the same set up in the front. Srt8 rotor = 360mm = 14.17". Rotors are 28 lb each.

And I'm running viper calipers on custom Coleman 14" rotors in the rear. Overkill for the back.

Clearance on GT500 wheels is tight but good (18x9.5 +45).





-'02 Dodge Viper Ex-World Challenge racecar
-'73 Duster, 6.1 based 392 hilborn hemi, tko600, full floater rear 9", Hellwig custom bars, viper brakes, built for road course
Re: Anyone running 14" brakes rotors? [Re: Uhcoog1] #1638556
06/26/14 10:44 AM
06/26/14 10:44 AM
Joined: Oct 2003
Posts: 21,345
Marysville, O-H-I-O
70Cuda383 Offline
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Nice setup. I'd like to know more about your mounting brackets, and which spindle you're using. Along with the hub set-up


**Photobucket sucks**
Re: Anyone running 14" brakes rotors? [Re: 451Mopar] #1638557
06/26/14 10:52 AM
06/26/14 10:52 AM
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Bitopia
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jcc Offline
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So I notice here for almost the first time in a decade, a brake size discussion "of mine are bigger then yours" on brakes that includes more then a mere suggestion on the package weight. We have actually made progress.

To bad its a little more complicated to include MOI in casual rotor discussions since diameter is such a factor.


Reality check, that half the population is smarter then 50% of the people and it's a constantly contested fact.
Re: Anyone running 14" brakes rotors? [Re: 451Mopar] #1638558
06/26/14 11:34 AM
06/26/14 11:34 AM
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Posts: 30,992
Oregon
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AndyF Offline
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Oregon
The mounting system is designed to handle different rotor diameters. You just add a spacer to move the caliper up to go from 13 to 14 to 15 inches.

8188128-6S_mount.jpg (322 downloads)
Re: Anyone running 14" brakes rotors? [Re: 70Cuda383] #1638559
06/26/14 12:38 PM
06/26/14 12:38 PM
Joined: May 2005
Posts: 723
Houston Tx
Uhcoog1 Offline
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Houston Tx
Quote:

Nice setup. I'd like to know more about your mounting brackets, and which spindle you're using. Along with the hub set-up




15/16" Master Cylinder, manual
rear bias adjuster
Caddy CTS-V pads (~0.3" taller than viper pads)
'Stock' Brembo pads in rear (HP1000), Raybestos ST-47 pads in front

Front:
Spindle- 73+ a body disc
Hub- aluminum, from dr diff
Bracket- steel, from dr diff
Front:


Rear:
Floater 9"
Ruff stuff specialties weld on brake brackets chopped down and re-drilled
1.5"x1.5" aluminum bar stock for adapter
Rear:




-'02 Dodge Viper Ex-World Challenge racecar
-'73 Duster, 6.1 based 392 hilborn hemi, tko600, full floater rear 9", Hellwig custom bars, viper brakes, built for road course
Re: Anyone running 14" brakes rotors? [Re: AndyF] #1638560
06/26/14 12:39 PM
06/26/14 12:39 PM
Joined: May 2005
Posts: 723
Houston Tx
Uhcoog1 Offline
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Houston Tx
Quote:

The mounting system is designed to handle different rotor diameters. You just add a spacer to move the caliper up to go from 13 to 14 to 15 inches.




That is fancy. I like that.


-'02 Dodge Viper Ex-World Challenge racecar
-'73 Duster, 6.1 based 392 hilborn hemi, tko600, full floater rear 9", Hellwig custom bars, viper brakes, built for road course
Re: Anyone running 14" brakes rotors? [Re: jcc] #1638561
06/26/14 01:36 PM
06/26/14 01:36 PM
Joined: May 2005
Posts: 723
Houston Tx
Uhcoog1 Offline
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Houston Tx
Quote:

So I notice here for almost the first time in a decade, a brake size discussion "of mine are bigger then yours" on brakes that includes more then a mere suggestion on the package weight. We have actually made progress.

To bad its a little more complicated to include MOI in casual rotor discussions since diameter is such a factor.




IMO, weight matters, but in a different way than you're saying.

Ideally, you want the lightest rotors that will handle the heat. For less-than-competitive racing, I like my 28 pound rotors- they're a huge heat sink and stave off brake fade.

A point of reference - Matt Robertson road races a dodge magnum, and switched from lightweight 2 piece rotors back to factory rotors. Why? Because the two piece rotors were very expensive and wouldn't hardly last a weekend. The factory SRT8 rotors last multiple weekends, cost much less, and didn't get as hot doing so.

I agree that increasing unsprung rotating mass isn't good, but it doesn't outweigh the benefits of the increased heat sink (i.e. weight) for most.


-'02 Dodge Viper Ex-World Challenge racecar
-'73 Duster, 6.1 based 392 hilborn hemi, tko600, full floater rear 9", Hellwig custom bars, viper brakes, built for road course
Re: Anyone running 14" brakes rotors? [Re: 451Mopar] #1638562
06/26/14 05:24 PM
06/26/14 05:24 PM
Joined: Jan 2003
Posts: 30,992
Oregon
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AndyF Offline
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Oregon
If you look in the archives you'll see a couple of magazine articles that I wrote on Tim's Valiant. We put a 13 inch Baer 6P kit on his Valiant and it works fine. Tim's car is road raced and has 150+ mph capability so it is very fast for a vintage Mopar. We could've gone 14 inch or 15 inch on the rotor size but there wasn't any reason to do so. The 13 inch rotors do the job from 150 so why go bigger. A 14 inch rotor does give you a little more leverage and a little more surface area and perhaps some additional head sink. I doubt that very many guys on here have a car that is fast enough to require a 14 inch rotor but nothing wrong with putting them on a car if you have the cash and don't mind spending it.

Re: Anyone running 14" brakes rotors? [Re: Uhcoog1] #1638563
06/26/14 05:29 PM
06/26/14 05:29 PM
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Posts: 22,695
Bitopia
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jcc Offline
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Bitopia
I suspect that brake technology has progressed in pretty big strides lately, in the area of pads/fluids. I have been around racing applications since discs (solid) were introduced. And surprisingly Nascar had to wait for the technology to progress enough before they became a user. That said, and I have said before, any un ducted brake system that can lock a tire in use, and doesn't fade, in competition should be considered over capacity in whatever way you choose to measure. Racers have for decades added ducting/blowers to be able to reduce the size of the heat sink, and all the benefits that reduced heat sink provides. I am doubtful many here are experiencing brake fade with a properly set-up brake system ( balanced correctly, correct pads for application, fresh bleed fluid). Anybody suffering severe brake fade has a problem with their brake system, or it s undersized for the application, or their driving technique might be in need of improvement. The only way to actually determine that, is to push the system to point of approaching brake fade. That should not be hard to do, if the system is balanced properly, concerning suspension, F/R, HP, etc. If that fade is difficult to achieve, ducting will provide more then enough safety margin for one's peace of mind, if it the can't, something is not in balance and you have brake system overkill, to a proven performance detriment. I have heard others say that brake ducting is difficult, well only if you haven't tried, and F1 aero is not a big concern. Anything is a lot better then nothing. I also get a kick out of the bigger brakes givening better modulation crowd, well if you are braking at 100% thresholds at over 100mph with the typical cars here, you are first 1 in 1000? and can't be gaining much insight on this forum. If you are running under 100mph and or autocross, your oversize brakes are costing you time.

FWIW at the recent optima Daytona,less then 1/3 of the cars had brake ducting, which for a competition event seemed rather strange, it was hot, it was long, and Daytona was/is likely one of the faster courses in the series. No way to find out reliability what factor brake fade played, on most of the big brake cars. remember it is 3+ miles long, serious banking, and possible to hit 160mph.

I think the last paragraph is fairly accurate, and I'm sure there will some disagreement on how to interpret my observation.


Reality check, that half the population is smarter then 50% of the people and it's a constantly contested fact.
Re: Anyone running 14" brakes rotors? [Re: AndyF] #1638564
06/26/14 05:33 PM
06/26/14 05:33 PM
Joined: May 2008
Posts: 5,399
Aurora, Colorado
451Mopar Offline OP
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I think any of the disc brake setups will be lighter than the 11x3" drums that are on my car now.

What is the difference with the spindles?
I know I need to change the spindles, but which is better in a '69 Coronet?

Re: Anyone running 14" brakes rotors? [Re: 451Mopar] #1638565
06/26/14 05:49 PM
06/26/14 05:49 PM
Joined: Jan 2003
Posts: 30,992
Oregon
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AndyF Offline
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Oregon
I use the taller (and lighter) FMJ knuckles on everything I build.

Re: Anyone running 14" brakes rotors? [Re: AndyF] #1638566
06/26/14 06:39 PM
06/26/14 06:39 PM
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Nebraska
72Swinger Offline
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Mine are same as Wades in the front except for color.

8188463-004.JPG (246 downloads)

Mopar to the bone!!!
Re: Anyone running 14" brakes rotors? [Re: 72Swinger] #1638567
06/27/14 05:34 AM
06/27/14 05:34 AM
Joined: May 2008
Posts: 5,399
Aurora, Colorado
451Mopar Offline OP
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So what about the rear brakes?
I have a stock Dana 60 with the tapered wheel bearings.

Re: Anyone running 14" brakes rotors? [Re: 451Mopar] #1638568
06/27/14 01:50 PM
06/27/14 01:50 PM
Joined: Jan 2003
Posts: 30,992
Oregon
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AndyF Offline
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Oregon
Doctor Diff has what you need.

Re: Anyone running 14" brakes rotors? [Re: 451Mopar] #1638569
06/27/14 05:27 PM
06/27/14 05:27 PM
Joined: May 2007
Posts: 553
Sac, CA, USA
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ntstlgl1970 Offline
mopar
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Sac, CA, USA
Quote:

Curious if anyone is running 14" brake rotors and how they worked out for wheel sizing and feel.
Whos kit and price would be nice too..

I have been looking at the Bear 14" with the 6P calipers, but they are $2,400+ each end.



I'm running this kit on the front of my car and I like it. As far as overall weight is concerned, it was a wash between my 10.875 rotor, slider caliper setup and the baer kit. Also 13 or 14" rotors are the same price. I like the pedal feel on mine, but I might try a different master cylinder bore to lessen the overall pedal travel a little bit. At willow springs, I didn't have any issues with fade. I think I was ~110-115 at the end of the straightaway into turn one so my car isn't as fast as others on here. I'm running the 11" stock drums in the rear. I also won't claim to be a great driver as this was my first track experience - just my 2 cents

Re: Anyone running 14" brakes rotors? [Re: jcc] #1638570
06/27/14 05:55 PM
06/27/14 05:55 PM
Joined: Jan 2003
Posts: 28,067
Irving, TX
feets Offline
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feets  Offline
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Irving, TX
Quote:

So I notice here for almost the first time in a decade, a brake size discussion "of mine are bigger then yours" on brakes that includes more then a mere suggestion on the package weight. We have actually made progress.






Someone must be ignoring my posts.
I've mentioned the weight penalty on almost every thread where I've discussed my brakes.


We are brothers and sisters doing time on the planet for better or worse. I'll take the better, if you don't mind.
- Stu Harmon
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