08-10 SS Turbocharged General Discussion Discuss the 2008 - 2009 Chevy Cobalt SS Turbocharged. On sale since the second quarter of 2008.

Front and rear brake informational thread

Old 07-05-2009, 12:21 PM
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Front and rear brake informational thread

First, PLEASE dont post in here how you have scoring on your rotors after x miles, any stories related to that, grinding noises etc. There is already PLENTY of threads for that.

What I wanted to do is start a thread that is for purely informational purposes. Post here where you have found sources for rear and front rotors, pads, etc only please! I spent several hours last night gathering up all the information I could find to post here, since I need new rotors and dont want to go through the dealer for them. I would like to update this post as we find CONFIRMED (no "i think" posts please!) data. Here is what I have found so far:

Brakes:
Front rotor GM part number - 15893541
Front Brembo caliper GM part number - FRONT LEFT P #25900763 FRONT RIGHT P# 25900764
Front pads GM part number - ?

Rear rotor GM part number - 15921402
Rear caliper GM part number - 25902073
Rear pads GM part number - 93190338

Where to buy?
Front rotors:
Local dealer
gmpartsdirect - part number 15893541 - $89.43 each
GenuineSaab.com, slotted front rotors - $280/Pair


Rear rotors:
Your local dealer - $unknown
gmpartsdirect.com - $47.83 each
Crate Engine Depot - Stock GM rotors $74.57 each
GenuineSaab.com rear slotted rotors (machined in house from genuine GM rotors) $182/pair

R1 SLOTTED rear rotors! $185/pair - r1concepts.com [email protected] - currently not listed on their page but if you call or email they can get em to you!


The rear rotors for a 2003 saab 9-3 DO NOT FIT. The measurements are the same, and they use the same pads, but they do not work.
*Note! RockAuto.com at the time of this post does NOT have the right parts listed for the 2008+ SS. Neither does most web pages when you look for the rear (or front) rotors.






Front pads:
Local dealer - unknown part number

Hawk Pads:
HB548W.590 DTC-30
HB548U.590 DTC-70
HB548N.590 HP Plus
HB548F.590 HPS Performance Street

EBC Pads:
Green stuff - DP21539
Red stuff - DP31539C (ceramic pad)

Rear pads:
OEM rears - Crate Engine Depot - $70.38

Hawk Pads:
HB478E.605 Blue 9012
HB478G.605 DTC-60
HB478S.605 HT-10
HB478Z.605 Performance Ceramic
HB478N.605 HP Plus
HB478F.605 HPS Performance Street

EBC Pads:
Green Stuff - DP21749
Red Stuff - DP31749C (Ceramic pad)

Alternate Rotors:

For reference if you are looking at a site you think may have the parts:
Front - 315.5mm x 26mm rotors, 38mm 4 piston Brembo aluminum calipers.
Rear - vented 292mm x 19.9mm rotors, 40mm single piston iron calipers

The calipers ARE different than the Sport!


Alternate Pads:

Rear pads from a Solstice work, GM part number - ? - I ran these on my car until I got the hawk pads above.

If you have information to add (again, please confirmed only) post it here and I will edit this post to reflect it.

Last edited by IsItFast?; 02-13-2010 at 01:32 AM.
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Old 07-05-2009, 09:16 PM
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If those are in fact the correct rear pad part numbers for Autozone (I'm sure they are), Advance Auto Parts carries PD1033 pads (usually next day delivery) for under $50 on their website.

NAD1033 are the cheaper versions.

Last edited by Hill1513; 07-05-2009 at 09:16 PM. Reason: Automerged Doublepost
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Old 07-07-2009, 09:57 AM
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rear rotors...

GM Part Number 15921402 (rear rotors): Back Ordered (Part is on national backorder with GM, GM does not currently have an ETA for the part to be released.
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Old 07-07-2009, 09:58 AM
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Old 07-07-2009, 10:33 AM
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Update from Tom at CrateEnginedepot: "I have just sold out yesterday, I had a lot but I guess I was the only one with them. I have them on order so if you want to check back that would be fine.”

So for those of us needing rotors that means there are NONE available unless your local dealer happens to have some in stock.
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Old 07-07-2009, 09:12 PM
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awwwwww, well what about the Saab 9-3 rotors?
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Old 07-08-2009, 01:02 AM
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Originally Posted by wantedSS/TC View Post
awwwwww, well what about the Saab 9-3 rotors?
they do NOT work...

Last edited by IsItFast?; 09-18-2009 at 11:50 AM.
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Old 07-14-2009, 11:13 AM
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....

Last edited by IsItFast?; 09-18-2009 at 11:50 AM.
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Old 07-15-2009, 12:39 PM
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Front Pad GM P/N

25808929

The PNs I recieved from a dealer for the rotors and rear pads correspond to the numbers listed, so I'd say that is a current PN.
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Old 07-15-2009, 12:44 PM
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doesnt r1 concepts make ss/tc rotors?

nope, just check sry guys

Last edited by camaromanss1992; 07-15-2009 at 12:44 PM. Reason: Automerged Doublepost
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Old 07-15-2009, 01:54 PM
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I would still stick with the saab rotors to see how they wear
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Old 07-16-2009, 12:05 PM
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Just a FYI. If you order ANYTHING from GM PartsDirect CALL FIRST and let THEM look up the part number. If you use THEIR on line catalog and order the part acording to THEIR listing and you get the wrong part, even if it is the right number from the on line catalog, you own it. Their are NO returns and definitlely no refunds. READ THE CONDITIONS OF SALE ON THE SITE. Their not kidding. I don't see how they can post a catalog with part numbers according to applications, sell you that part number and not take it back if THEIR catalog is wrong. I, personally, wouldn't order anything from them again even if meant I would have to walk.

In a previous life I was the parts manager for a Pontiac agency so I DO know how to use a parts book.
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Old 07-18-2009, 10:53 PM
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I am just wondering who sells really good high performance pads, and some slotted/drilled rotors for these cars... I would like to purchase some in the near future.
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Old 07-19-2009, 02:41 AM
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Originally Posted by buellfooll View Post
Their are NO returns and definitlely no refunds. READ THE CONDITIONS OF SALE ON THE SITE. Their not kidding. I don't see how they can post a catalog with part numbers according to applications, sell you that part number and not take it back if THEIR catalog is wrong. I, personally, wouldn't order anything from them again even if meant I would have to walk.
Yeah, adding my 2 cents about all the parts sources above: it does NOT mean I am recommending them - just that is where I have found parts so far. As a matter of fact gmpartsdirect sent me an email shortly after my order telling me about the backorder. In it they stated reply that you want to cancel or wait. I replied with a cancel request. 7 days later I was delivered TWO sets of rotors.. So not very impressed with them. However they are still the cheapest source as of now.

Originally Posted by Jbernal4368 View Post
I am just wondering who sells really good high performance pads, and some slotted/drilled rotors for these cars... I would like to purchase some in the near future.
Read the original post, toward the bottom. Hawk has an entire line of performance pads, and genuinesaab.com carries machined (slotted) stock rotors, front and rear. I cant vouch for this company, but they do carry a (currently) unique part.
http://www.genuinesaab.com/catalog/p...roducts_id=692
R1 now has the rear slotted rotors, but you need to call

Last edited by IsItFast?; 09-18-2009 at 11:52 AM. Reason: Automerged Doublepost
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Old 07-23-2009, 10:03 AM
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IsItFast do the Saab rotors work because I can no longer drive my car?
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Old 07-23-2009, 10:15 AM
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Originally Posted by dthomp2366 View Post
IsItFast do the Saab rotors work because I can no longer drive my car?
nope sorry...

Last edited by IsItFast?; 09-18-2009 at 11:52 AM.
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Old 07-23-2009, 01:15 PM
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Originally Posted by IsItFast? View Post
I still can't say for sure unfortunately. The part I received from the eBay dealer were the front rotors for a BMW 5 series(his mistake still trying to get it corrected).. I do have an extra set of rear rotors from gmpartsdirect, but it would probably cost me as much to ship as buying them directly. I hear you about not driving the car, i've been driving my 9mpg f250 while I wait on the rear brake pads from the hawk hps group buy.

The mesurements I posted are the same for the Saab as our cars, so they should work, but I can't say for sure. If you get a pair and they work please update this thread.
I have a parts guy from GM acquiring them for me but I have Hawk pads already. What model and year saab?

I ordered the Saab 9-3 rear rotors. I'll find out if they fit when I get them. They're coming from CA to MD so it may be 2-5 days until I know.

Last edited by dthomp2366; 07-23-2009 at 01:15 PM. Reason: Automerged Doublepost
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Old 07-28-2009, 07:17 AM
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Straight from the Hawk Catalog:
Front (for 08-up SS Brembo)
HB548W.590 DTC-30
HB548U.590 DTC-70
HB548N.590 HP Plus
HB548F.590 HPS Performance Street

Rear (for 08-up SS/TC only)
HB478E.605 Blue 9012
HB478G.605 DTC-60
HB478S.605 HT-10
HB478Z.605 Performance Ceramic
HB478N.605 HP Plus
HB478F.605 HPS Performance Street

I currently have the HB478F.605 HPS on the rear of my SS/TC. They produce far less dust than the stock pads, and the dust is a very light tan color when observed on the wheel. I've logged just about 1000 miles and the rotors are smooth to the touch.
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Old 07-28-2009, 12:44 PM
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Originally Posted by metroplex View Post
Straight from the Hawk Catalog:
Front (for 08-up SS Brembo)
HB548W.590 DTC-30
HB548U.590 DTC-70
HB548N.590 HP Plus
HB548F.590 HPS Performance Street

Rear (for 08-up SS/TC only)
HB478E.605 Blue 9012
HB478G.605 DTC-60
HB478S.605 HT-10
HB478Z.605 Performance Ceramic
HB478N.605 HP Plus
HB478F.605 HPS Performance Street

I currently have the HB478F.605 HPS on the rear of my SS/TC. They produce far less dust than the stock pads, and the dust is a very light tan color when observed on the wheel. I've logged just about 1000 miles and the rotors are smooth to the touch.
So the Hawk HPS part number listed by the op for the rear is wrong? It says "Hawk HPS rear - HB525F.540" you say "HB478F.605 HPS Performance Street", so did I order the wrong pads?
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Old 07-28-2009, 12:46 PM
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Old 07-28-2009, 01:17 PM
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HB478F.605 is the proper pad for the TC's. HB525F.540 is for the SS/SC's
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Old 07-28-2009, 01:43 PM
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Originally Posted by xray_racer View Post
So the Hawk HPS part number listed by the op for the rear is wrong? It says "Hawk HPS rear - HB525F.540" you say "HB478F.605 HPS Performance Street", so did I order the wrong pads?
If you ordered the 525F.540 for your 08 SS/TC, yes they are the wrong pads. The 525's are for the SS/SC as previously mentioned.

I asked Hawk to change their catalog and it took some teeth pulling to make them realize that the SS/TC's used a different pad, and one that is actually the same as the ones used on Solstice/Sky/ Saab 9-3, Volvo S40, and some of the Mazda3 cars. I ordered my 478F.605 via Tirerack by telling them I had a 2005 Mazda3 because they wouldn't use the correct data.

The Hawk catalog has been correctly updated though. The OP should change his post to reflect the correct part #s to avoid any confusion. I also wrote a how-to in case anyone wanted a guide:

https://www.cobaltss.net/forums/how-guide-43/how-changing-rear-brake-pads-2009-ss-tc-coupe-168212/

Also, how to adjust your e-brake:

https://www.cobaltss.net/forums/how-guide-43/how-adjusting-emergency-parking-brake-05-09-cobalt-w-rear-disc-brakes-168592/

I recommend adjusting the e-brake to prevent the rear pads from binding.
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Old 07-28-2009, 01:56 PM
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Just got a PM from NGA Motorsports and they did send me the right pads.
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Old 07-31-2009, 09:50 AM
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Saab rotors bolt up but DO NOT FIT our cars. I received some extra pads with the rotors so I put them on the horrible stock rotors until I can find a stock replacement.
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Old 07-31-2009, 12:19 PM
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Originally Posted by dthomp2366 View Post
Saab rotors bolt up but DO NOT FIT our cars. I received some extra pads with the rotors so I put them on the horrible stock rotors until I can find a stock replacement.
Ok, thanks for that information - sorry you had to be the one to find that out but you probably just saved quite a few people from doing the same. Which Saab did you order the rotors for?

(I'll edit the original post later, posting this from my iPhone in an area with bad reception - it's like being on dialup lol)
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