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Discussion Starter #1
I was updating some of the specs, and found that cars.com had the rotor sizes and other sources have identified the brakes as front vented/rear solid discs.

http://www.cars.com/go/features/autoshows/vehicle.jsp?autoshow=&vehicletype=production&autoshowyear=2004&vehicle=production_Pontiac_Solstice

Shows the front at 11.7 inch Vented rotor/ rear 10.6 inch solid rotor.

Then I was looking at the ION redline (which I assume is sharing componentry with the hi-power Cobalt), and noticed that the ION Redline is 11.6 inch Vented rotor / Rear 10.6 inch Solid Rotor.

http://www.sportcompactcarweb.com/roadtests/0405scc_redline/
http://www.caranddriver.com/article.asp?section_id=19&article_id=7370

THEN I found the Malibu MAXX brake specs:
Front rotor (diameter x thickness, in / mm): 11.65 x 1.02 / 296 x 26; vented discs
Rear rotor (diameter x thickness, in / mm): 10.63 x 0.55 / 270 x 14; solid discs

http://www.autoweek.com/specials/2003_newyork/maxx/info.doc


Do you think these may be the same brakes? The sizes are suspiciously famaliar.

Maybe we should put together a list of things that are shared or suspected shared in a new thread? That might be interesting.
 

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there will probably be a "parts bin" upgrade available.

in the grand prix world we figured out that we can use the caliper bracket from an oldsmobile intrigue to move the caliper ut so we can go from 10.9 to 11.9 front rotors, then later on someone else figured out that we coudl swap out our calipers for corvette or firebired improved calipers.

I would be surprised if we wont be able to figure something out for these cars as well.

-K
 

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It wouldn't surprise me any to see Pontiac grab a parts bin rotor for the breaks on this car. Especially if they have some such as on the Ion/Cobalt that are already being used in a performance application and can withstand the heat and abuse. It saves development money, and makes the vehicle cheaper to maintain and repair down the road.
 

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I have had some cars which suffered warped rotors from time to time, and most have been vented rotors too. I think the main reason was that the brakes on the vehicle where really too small for the weight and size of the vehicle. Since the Solstice's brakes seem to be a decent size, hopefully bad warping won't be a problem.

It also may depend on the quality of rotors. My 02 Wrangler has suffered warped rotors a lot. In its case, it may be that the brakes are too small. But I also think that Chrysler may be using a cheap rotor, and if they had sourced a better rotor they would be ok. Others who have switched to aftermarket rotors on the Jeeps report that they last longer before warping, but I have not tried it yet. As long as the dealer will replace them every 9000 miles under warranty, I am content to let them do so!
 

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Discussion Starter #6
OK,

Calling all you fellow engineering geeks out there... how do you do a calculation of swept area?

Is it just the total of the "shiny" areas of the brake rotors? Do you add both surfaces of the rotor?

I was just goofing around, and

at 11.65" front and 10.63" rear rotor,
and assuming a 1 3/4" front pad, 1 1/2" rear pad,

I get a really wacky number (different from the GM info) calculation for the rear total swept area - I think the GM documents may be incorrect:


Front swept area estimated at 217.7 total sq inches (Area of the whole rotor, minus the area of the rotor not touched by pad, times two for both sides of the rotor, times two for both front rotors). This is close to the reported 208.3.

Rear swept area estimated is 172.1 total sq inches using above assumptions, which is almost double the reported area from the Malibu Maxx info.

That means a total of about 390 sq in swept area - I think that's actually pretty good - about 256 sq in of swept area per ton (using 2860lbs plus a paylod of 180 lbs similar to road&track as-tested weight).

Anyone else try this? The RX-8 is 282 sq in/ton, for a simple comparison http://www.roadandtrack.com/assets/download/3272003171557.pdf ans supposed to have outstanding braking (although tire traction has a lot to do with braking too).
 
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