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  #1  
Old 15th January 2010
markswan markswan is offline
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Default How do I determine proper brake disc size?

Hi all,

I want to replace my front brakes on my 2005 9-3 sport sedan. The specs I find on Alldata.com show three "levels". I cannot find anywhere that shows which ones are correct or recommended. Any help in proper ID without first taking them off and measuring would be great.

Thanks!
Mark
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  #2  
Old 15th January 2010
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Ferms_93_2.8T Ferms_93_2.8T is offline
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Honestly, if you want to be absolutely sure, you might as well remove the wheel and measure. I can't think of a more definitive way to assess exactly which rotors you have.

I suppose you could measure with the wheel on but I'm not sure that would be completely accurate. Do the '05's have the brake codes on the door placard?

As you've probably seen through searching the threads, there is no other absolute way. Many cars were shipped with the incorrect brake sizes for the trim level anyway.

Good Luck!!!!
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  #3  
Old 15th January 2010
Pokerguy Pokerguy is offline
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Quote:
Originally Posted by Ferms_93_2.8T View Post
Do the '05's have the brake codes on the door placard?
Absolutely they should.

The sticker is found on the sill of the drivers door. Open the door and look down below the door latch on the frame or body of the car.

The following info comes from a couple of different older posts (Ferms_93_2.8T, jrldrony) ;

The sticker looks like this :



As far as the letters go (bottom line, far right) :

The first couple describes the front brake disc.

AA: 15" 285mm
AB: 16" 302mm
AC: 16"+ 314mm (mounted on 2.8 V6)
AD: 17" 345mm (starting from 2008 only on Turbo X)

The second couple describes the rear discs

BA: 15" 278mm (from 2003 to 2007 on 1.8i, 2.0t, 1,9JTD. From 2008 on only mounted on 1.8i)
BB: 16" 292mm
BC: 16" 292mm only on XWD

The third couple describes front brake caliper

CA: 15"
CB: 16"
CC: 16"+
CD: 17"

The fourth couple describes rear brake caliper

DA: 15"
DB: 16"
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  #4  
Old 15th January 2010
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^^very good info!
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  #5  
Old 15th January 2010
markswan markswan is offline
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Default

Great info indeed! Thanks very much for all of the replies.

Mark
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  #6  
Old 23rd January 2010
Bajan93 Bajan93 is offline
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Default brake codes

I just check for my brake codes and my sticker is blank how is this possible, ther is no way i can tell with out measuring.

mine reads like this 13-11-1- -17-11- - - WTF!!!!
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  #7  
Old 23rd January 2010
JonV JonV is offline
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What Trim Level Model do you have? The Simple way is to use a manufacturers or tire racks application guide and just enter the model. You say 93SS, but is it a Linear, Arc or Aero?
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  #8  
Old 23rd January 2010
Bajan93 Bajan93 is offline
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sorry bout that I have a linear.
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  #9  
Old 23rd January 2010
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Don't listen to guys who tell you that you have a certain setup of brakes on a 05 Linear...

Quite a few Linears rolled off the assembly line back in 05 with Aero spec brakes front and rear. Combine that with the fact that some V6 aeros 06+ got what used to be linear non-vented brakes in the rear and finding what brakes you have can be a pain in the butt.

Like one poster on here already said... Jack up the car, pop the wheel off, and whip out a ruler. For the rears its a little easier I believe because prior to the 06's the rears could only come with 285mm solid rotors or 292mm vented rotors... so for that all you had to do is look to see if your rotors are vented.

If you are not comfortable with taking the wheel off I suggest you just go to a dealer and just sit back and get plowed.
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  #10  
Old 24th January 2010
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Ferms_93_2.8T Ferms_93_2.8T is offline
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Quote:
Originally Posted by cavedudejeff View Post
Don't listen to guys who tell you that you have a certain setup of brakes on a 05 Linear...

Quite a few Linears rolled off the assembly line back in 05 with Aero spec brakes front and rear. Combine that with the fact that some V6 aeros 06+ got what used to be linear non-vented brakes in the rear and finding what brakes you have can be a pain in the butt.

Like one poster on here already said... Jack up the car, pop the wheel off, and whip out a ruler. For the rears its a little easier I believe because prior to the 06's the rears could only come with 285mm solid rotors or 292mm vented rotors... so for that all you had to do is look to see if your rotors are vented.

If you are not comfortable with taking the wheel off I suggest you just go to a dealer and just sit back and get plowed.

+1, I know it sucks, but just take one front wheel off and measure. You will be much happier knowing for sure.
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  #11  
Old 24th January 2010
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Quote:
Originally Posted by cavedudejeff View Post
Don't listen to guys who tell you that you have a certain setup of brakes on a 05 Linear...
you are right
I must learn about experience advises; once, I bought pads for my Opel Omega in the dealer, I took off the wheel & pads and didn┤t match. double job and go back to the dealer again. my calipers it was from Lucas and the pads I bought from Bosch.
- two different calipers for the same car and model year.
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  #12  
Old 2nd February 2010
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The size of the brake rotor is stamped into the brake caliper. You might even be able to read the numbers without taking off the wheel.
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  #13  
Old 28th February 2010
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lucky me then with an early '06 Aero I got the smaller brakes and did double check the fronts they are 302MM

AB-BA CB-DA
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  #14  
Old 1st March 2010
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Quote:
Originally Posted by Bajan93 View Post
I just check for my brake codes and my sticker is blank how is this possible, ther is no way i can tell with out measuring.

mine reads like this 13-11-1- -17-11- - - WTF!!!!

My '04 says the same thing, - - -. Sigh.

-jason
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  #15  
Old 5th October 2012
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Question I know this is an old post but I have a question

Quote:
Originally Posted by bryubpharm View Post
lucky me then with an early '06 Aero I got the smaller brakes and did double check the fronts they are 302MM

AB-BA CB-DA
I have the same codes on mine but the code says that the 302mm is for a 16" rim??? I definitely have 17" stock rims so does your car have 17" rims too?
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  #16  
Old 6th October 2012
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Measuring what you already have might not always work--the ones I already had were too small. Use the codes provided above (thanks!) or CALL the stealership.
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  #17  
Old 21st June 2013
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Quote:
Originally Posted by Deli-Llama View Post
The size of the brake rotor is stamped into the brake caliper.
It wasn't on my Linear. At 93,600 miles I'm about due for rotors so I pulled the wheels (again, had a debate with the guy at the parts counter) and measured. 292mm on the rear (no measurement on either rear caliper!!) and 302mm front (it WAS cast, not stamped on the calipers). I was right though - the rear brakes are NOT solid and are NOT the smaller disc. But I'm blonde so I don't know cars, he is obviously correct. lol.
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  #18  
Old 29th March 2014
Mark986 Mark986 is offline
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I hate to beat this thread to death, but the more I read the less I know.

If I have the vented rear rotors on a 2005 Linear, does that mean that I have the upgraded brakes from the Aero? So the 302mm in front and the 292mm in the back?

They wouldn't have put the 292mm Aero rotors on the back but kept the 285mm Linear rotors up front, would they?

I have 16" wheels, if that factors in to anything. I don't have the door jamb sticker that gives rotor sizes, and I see no stamped or printed rotor size on the calipers.
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  #19  
Old 29th March 2014
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vented rears do indeed mean 292mm..
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  #20  
Old 29th March 2014
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Quote:
Originally Posted by Mark986 View Post
I hate to beat this thread to death, but the more I read the less I know.

If I have the vented rear rotors on a 2005 Linear, does that mean that I have the upgraded brakes from the Aero? So the 302mm in front and the 292mm in the back?

They wouldn't have put the 292mm Aero rotors on the back but kept the 285mm Linear rotors up front, would they?

I have 16" wheels, if that factors in to anything. I don't have the door jamb sticker that gives rotor sizes, and I see no stamped or printed rotor size on the calipers.
Who knows, but I've seen 2005 Linears with 302 up front and 292 in rear before. Best way is to measure.
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