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Bonneville GXP/ Northstar Powered Cars Discuss your Bonneville GXP and/or any other Northstar powered Olds or Cadillac... Including the 3.5L Twin Cam V6 (Short Star ) 4.0L and 4.6L Northstar V8's. Please use General Chat for non-mechanical issues, and Performance and Brainstorming for improvements.

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Old 02-25-2010, 03:36 PM   #1
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Default Calipers for GXP

Based on the GM part number, the front and rear calipers are GXP ONLY, but I assume that this is because of the red powdercoating from the factory.

I don't think that GM would have designed a caliper that was only used on the '04-'05 Bonni GXP. I would guess that the same calipers (in natural finish) were used on a number of other applications.

Does anybody have any knowledge of the other GM vehicles using the same caliper design?
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Old 02-25-2010, 03:47 PM   #2
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cadillac seville, deville
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Old 02-25-2010, 05:30 PM   #3
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They are different, use bigger rotors than an SSEi, along with a nicer suspension
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Old 03-03-2010, 12:37 AM   #4
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I happen to know the (former) Delphi DR engineer for the GXP brakes/suspension. I asked him. He recalled that the "natural" version came from the Cadillac SRX. I checked on Ebay and found the attached picture.
According to the listing, the naturals are found on:
CAD SRX 04-08 FRONT RH
CAD STS 05 FRONT (ABS), opt JE5, RH
CAD STS 06-08 FRONT base, opt JE5, RH

He couldn't remember where the rotors came from for certain, but recalled that F-body rotors could be used if the bolt holes were drilled-out for the slightly different hole pattern. He also thought the SRX rotors were the same but had a 6 bolt pattern? I don't know... his memory.... it has been several years.

Now, for Gosh sakes, this is all speculation, until someone can verify.
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Calipers for GXP-srx-calipers.jpg  
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