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  #1 (permalink)  
Old 11-22-2007, 12:44 PM
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Database for brake disks?

Sorry for the dumb question but...
Does anyone know of a database or site where I can look up brake disk dimensions? (I know there are millions of different rotor out there, but if I could just narrow it down a bit...GM, Chrysler, etc)

I'm doing a brake conversion, and need to see disk dimensions (mainly hat depth, overall height) so I can figure out offset possibilities. To start, I know I am looking at a 11� (280mm) diameter disk. The thickness can be between 23mm-30mm As far as bolt circles go, I will be looking at both 4 lug and 5 lug setups. (Worse case scenario I will have them re-drilled.) As confusing as this may sound right now, I'm trying to see what choices I will have, either going with a front or rear hub mount. A Front hub mount, will add offset (hat thickness) and that I will have take into consideration when choosing wheels. I am hoping to be able to find the right disk, so I will not have to use spacers when mounting the calipers

For the curious that want to know what I'm doing...
It is a 72 Toyota Celica with a Buick Grand National Drive train. It currently has 86 Toyota Supra struts with coilovers up front, that provided a larger brake caliper and rotor over the stock Celica. And has a Ford 9� rear end with a disk setup.
My upgrade plans are to use a quad piston caliper from a Nissan 300ZX (Z32) This caliper bolts directly onto the Supra strut. The factory strut had a 4 lug (rear mount disk) hub. Early Nissan Z31 5 lug hubs bolt directly on to the Supra strut as well, so I am hoping to find a 280mm disk that would be a rear mount to bolt onto the back of the Z31 hub and have the right hat offset to center in the caliper.
I have looked at a bunch of on-line brake parts places but none list the crucial dimensions that I need, and searching randomly this way (just punching in random vehicles) is kinda like looking for a needle in a haystack. I know I may not be able to come up with the exact disk, so minor machining and small caliper spacers are acceptable.

FWIW Please don't tell me to just buy a Wilwood brake kit.

Thanks,
Paul

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Old 11-22-2007, 12:54 PM
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The most frustrating thing in my life (okay, top 50 anyway) was finding the right rotors for my Buick Skylark. In the end I turned the axle flanges down to fit inside the rotor hat. I tried to buy rotors from SBC and Wilwood and they just don't sell them separately.

Here's my experience for the rear. You have a choice of 10.5 or 11 inch rotors - they are all the same thickness (except for the non-vented 10.5 rotors that came on some 80s Camaros) at roughly 1.1 inches.

http://www.rockauto.com/ has a pretty good site for checking out dimensions and such you simply have to look up by car....
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Old 11-22-2007, 03:10 PM
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Instead of asking the parts stores.....I would think that you could go straight to one of the rotor manufacturers and get a list of the demensions of the rotors that they make. Most manufacturers have web sites.
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Old 11-22-2007, 08:14 PM
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The manufacturers no doubt have internal databases for their parts, but I don't believe you or I can get access to that information.

As far as after market suppliers, while they might have websites, they'll likely be in Chinese.

Check with NAPA and see if they have numerical/dimensions data in their brake parts catalog.

I have an old Chassis Parts Catalog from NAPA that has been very beneficial in finding steering rack, tie rod end and king pins info including dimensions for several categories of items.

Let us know as I won't be able to get to a NAPA store for a couple of weeks.
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Old 11-22-2007, 08:38 PM
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I suppose I should have been clearer in my prior post.
www.RockAuto.com has pictures, drawings, dimensions, and comparisons of many of the parts they carry. Their only "drawback" (drawback for those seeking to find a part that fits) is you need to know what cars have what option you are looking for on them.
For example, when looking for rear disk brakes - you need to know that 1979 Firebirds, 1983-1992 Camaros Z-28 and IROC, 1977-1979 Cadillacs Sevilles all have 5 on 4 3/4 bolt patterns and they are vented rear rotors... you can't simply say "list all rear disk brakes"... you have to know the make, year, options, and some cases sub options to look up the parts... despite that "limitation" it is an invaluable site for at least doing a preliminary search for what you are looking for.
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Old 11-22-2007, 09:00 PM
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I'm quite sure that Wagner has a drum and rotor spec book that gives dimensions and minimum thickness specs. They give that book to the installers who usually hang it up next to their brake lathe.

I also seem to recall one of the Wagner books (buyer's guide?) had a letter that designated the "hat" style and had all of those dimensions as well.

If I get a second tomorrow, at work, I'll try to scrounge thru the pile of "seldom-used" catalogs upstairs, and see if I can find it and give you the proper name and publication number...
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Old 11-23-2007, 07:39 PM
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Brembo is the only one that I know of that has that kind of info.
https://www.brembo.com/ENG/catalogo_AM/2007/index.html

You can also download their catalog but be warned it is VERY BIG (283 MB)
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Old 11-23-2007, 08:02 PM
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Triaged:

That's an awesome catalog!

Bookmarked!!!
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Old 11-23-2007, 08:34 PM
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That is an awesome catalog.
I am not saying call wilwood and buy a kit...


BUT!
Wilwood also has a catalog that lists the parts by dimension.

Check it out here,
http://catalogs.wilwood.com/_pages/tech.html

If you find the rotor you like, you can pair it up with a hat with the correct offset/ bolt center/ flange diameter and bolt kit.

Then call Jegs with the numbers and they can sell it to you at a pretty good savings.

I got all of the wilwood paper catalogs last year, they are a good source for rotors. I would use someone elses calipers though.

Here is another nifty page with some dimensions

http://www.wilwood.org/ds544.pdf

I'd print it out if I were you.


It may do you some good if you need a cross reference or want to get just the hub.

I have a Raybestos buyers guide, like the one that 66gmc is talking about, it lists rotors by size, but it leaves out some critical dimensions that make it hard to spec a rotor for an application.

You can also try Coleman racing.


Later, mikey


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Old 11-23-2007, 09:24 PM
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Thanks for all the help and suggestions guys, it is greatly appreciated.
I'll have a look through that catalogue Triaged (Thanks)

I'm working on crunching some measurements that will hopefully give me the correct dimensions for the rotor I will need.

Paul
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Old 11-27-2007, 08:49 AM
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I'm getting closer. The Brembo catalog helped a lot. (Thanks) They didn't list any info for a 93 Mazda MPV 4WD disk. I still need to find the overall height for that disk. The search continues...

Paul
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Old 11-27-2007, 09:04 AM
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From www.napaonline.com

Quote:
Item#: NB 4886321

Price: $41.99
tax and shipping not included

Disclaimer: The stated price may vary from the in store price and may change at anytime.


Attributes:
Features & Benefits:Manufactured with Original Equipment Vane Configuration.
Features & Benefits:Meets Original Equipment Fit
Form & Function.
Brake Rotor Type: Disc Brake Rotor Only
Bolt Circle Diameter:4.5"
Outside Diameter:10.86"
Discard Thickness:1.024"
Thickness When New:1.1"
Height:2.515"
Vented / Solid:Vented
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Old 11-27-2007, 07:45 PM
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Right in front of my face... LOL I feel a little sheepish. Napa online is now my friend.

Thanks
Paul
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Old 12-01-2007, 12:37 PM
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After much searching (again, thanks for the links) and some previous legwork done by some friends, I have found the right (or really close) disk for my setup.
It is a 2006 Chrysler PT Cruiser GT disk:
80mm (11.0” ) Diameter
26.4mm (1.04” ) Thick
39.6mm (1.56” ) Height
I was looking at the options of going with a front hub mount or rear mount disk setup. The problem with the front hub mount (MPV disk) was it gave me a +14mm wheel offset.
For those that are curious...
My Toyota strut shaft MA61 shares the same bearings as the early Nissan Z31 hubs, so the Nissan 5 lug hub will bolt directly on to the strut. The Nissan Z32 4 piston fixed caliper, and Infinity Q45 2 piston sliding caliper also bolts directly on to the strut. The task was to find the right size disk with the correct offset or hat height, to work with the calipers without having to use mount bracket spacers or shims.
Last task is to now find a bearing grease seal that fits the Z31 hub and MA61 axle.

Thanks,
Paul
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Old 12-02-2007, 01:24 AM
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I've got a link for the seals too...

http://www.skf.com/skf/productcatalo...ogue=1&lang=en
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