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Ok, I have owned floaters for quite a while now and have had trouble with imbalance/brake vibration a few times.

In every case (so far) it turned out to be pad build up on the rotor, perhaps caused by the crossdrilling peeling off more of the pad than a conventional rotor? Who knows.

But in all cases what it took was a series of very heavy braking/acceleration sequences to burn the rotors clean and then all was well for a while. Vibration went away/was greatly reduced.

Just sayin' this might be the issue...

Dennis
Old 07-05-2017, 04:55 AM
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Just so everybody is on the same page here, those rotors and hats pictured are not the original 930 parts. Those look like they are VCI rotors which use their own hats and I believe a Wilwood UL (UltraLight) or Coleman rotor. People here on Pelican in the past have experienced problems with those rotors warping. Not pad material buildup warping. Actual rotor warpage.

930 Brake Upgrade 911 - Carrera - 914 - 914/6
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Old 07-05-2017, 05:44 AM
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FWIW,....

I've not had any successes with Coleman 930 rotors over the years and I've found them to have as much as .011" runout, right out of the box.

Once in service, it gets much worse and there isn't sufficient rotor mass to true them up in brake lathe without compromising their thermal dissipation capacity.

Having tried that, they warped again (even faster).

We will not use Coleman rotors in these sizes due that reason. You get what you pay for.

Naturally, JMHO.
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Old 07-05-2017, 08:29 AM
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If I scrap my disks, what setup, solid or floating, and manufacture would you advise?

Thanks!
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Old 07-05-2017, 09:16 AM
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I have floating VCI hats with stock 930 rotors, they have been really good. The do make a lot of noise... If street driving is the majority I would choose non-floating
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Old 07-05-2017, 09:34 AM
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Very good thread !!!

Thanks for share
Old 07-06-2017, 01:42 PM
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This should help.

https://youtu.be/eTECIPwSG-U


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Old 07-06-2017, 05:18 PM
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With the original Porsche 930 hats ... if I recall correctly, you install them with the bevel outward and they are either floating or not floating and you can install the with the bevel inward the you will get the opposite effect. Can't remember exactly which way is floating but I think it is listed in the Porsche Work Shop Manual.

Rahl
Old 07-06-2017, 07:00 PM
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Holy Cow Bill used my picture in his post!!!! What is the world coming to. I'll admit that is an honor. My 930 brakes are flawless and scare the ship out of my friends that ride along. I can go deeeeeeeep into corners than apply the jawzz of life to my silly little cab.

Got my rotors off p a r t s g e e k . c o m for half the price seen elsewhere. Well, go check out my thread. LOL.
Old 07-06-2017, 08:11 PM
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I think Clint is now just reselling the Coleman T-locks. I'm still all butthurt you guys wouldn't tell me about Coleman. Had to search the dark underbelly of the interwebs to find them stupid things.
Old 07-06-2017, 08:17 PM
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Not sure I did a thread here on raising my spindles 26mm and de-cambering them by 1 on a milling machine I got off Craigslist. Used parts from Rebel Racing and had a customer do the final welds. Love Clint. Highly recommended.

And ya, the pawn shop unloads all it's Snap On on me...


Old 07-06-2017, 08:39 PM
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Crap....where is the toolbox picture. About 35 sets of SO. Built the box myself right where it sits.

Old 07-06-2017, 08:43 PM
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Quote:
Originally Posted by avorkinn View Post
If I scrap my disks, what setup, solid or floating, and manufacture would you advise?

Thanks!
Go to p a r t s g e e k . c o m and enter 1978 for year, Porsche for maker, and 930 for model. Select the Zimmermann rotors. I've got Sebro in the back from them. Was literally half price and the same exact parts. Sorry, but the deals are out there.

Then go to Rebel and get the hats and Tlocks. The rotors and hats will have 12 slots in each so you will need 24 Tlocks. If you go to Coleman you will need to buy 3 of their 8 packs.

EDIT: I see that my other source has raised their price to the level Pelican has them....so go with Pelican. I've got Sebro on the back.

Last edited by douglas bray; 07-06-2017 at 09:26 PM..
Old 07-06-2017, 08:55 PM
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I have done as told, parts are ordered from Rebel and Pelican, except I went for the Sebro disks, they are below 1/3 of the price compared to Zimmerman. The car is mostly used for street driving, my be trackdays, no racing, the car is below 1000kg, I will never manage to use the brakes to the limit.


Quote:
Originally Posted by douglas bray View Post
Go to p a r t s g e e k . c o m and enter 1978 for year, Porsche for maker, and 930 for model. Select the Zimmermann rotors. I've got Sebro in the back from them. Was literally half price and the same exact parts. Sorry, but the deals are out there.

Then go to Rebel and get the hats and Tlocks. The rotors and hats will have 12 slots in each so you will need 24 Tlocks. If you go to Coleman you will need to buy 3 of their 8 packs.

EDIT: I see that my other source has raised their price to the level Pelican has them....so go with Pelican. I've got Sebro on the back.
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Old 07-16-2017, 01:21 AM
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Quote:
Originally Posted by avorkinn View Post
I have done as told, parts are ordered from Rebel and Pelican, except I went for the Sebro disks, they are below 1/3 of the price compared to Zimmerman. The car is mostly used for street driving, my be trackdays, no racing, the car is below 1000kg, I will never manage to use the brakes to the limit.
Sebro is the way to go then. Same same. I don't know what was up with pricing. I even noticed some vendors had lefts but no rights or visa versa.

At this point the only thing I'd do is swap in more aggressive rear pads on my car. I can lock up the fronts long before the backs.
Old 07-16-2017, 12:34 PM
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Quote:
Originally Posted by douglas bray View Post
I think Clint is now just reselling the Coleman T-locks. I'm still all butthurt you guys wouldn't tell me about Coleman. Had to search the dark underbelly of the interwebs to find them stupid things.
Hey now. I pointed you to them directly. Give credit where credit is due?

Cleaning/Rebuilding 930 Calipers....
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Old 07-17-2017, 11:22 AM
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Rebel don't respond either on mails or on the order, are they up running?
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Old 07-18-2017, 08:19 AM
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Quote:
Originally Posted by avorkinn View Post
Rebel don't respond either on mails or on the order, are they up running?
Search is your friend.... Go somewhere else.
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Old 07-18-2017, 08:27 AM
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Still in business making stuff. Their communication is slooooooow sometimes

I ordered some sway bar square nuts and some brake flex lines a few weeks ago and I'm still unaware if and when the order will ship
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Old 07-18-2017, 08:29 AM
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I had to make a reorder, I got reply from Rebel, their setups were for fixed rotors only. I have ordered, from VCI, floating hardware used with Porsche original rotors.
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Old 07-24-2017, 09:28 AM
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