There is no stock Cobalt that has Brembo calipers on the rears. One can buy aftermarket Brembo discs for the rears on the SS; NAPA advertises them. ATE is OEM for the European Delta series platform of which the Saab 9-3, Cobalt, HHR, Saturn Ion, Pontiac G5, Pontiac Pursuit in Canada, OPEL GT (2007 on) GM Europe, and the Vauxhall VX220 (GM UK) share. GM USA couldn't use its US brake parts on cars destined for the European marketplace as very few; at the time, were TuV certified which is required by the EU Directive (take it as law) on European Harmonization standardization to obtain the CE mark for all goods sold within the EU as certified for merchantability there.) Only the Cobalt SS TC came with Brembo front calipers. All models of the Cobalt use ATE (part of Contitech now) brake calipers on the rears. These same rear brakes appear in several models of OPEL, Saab 9-3 YSF (B207R) and on the Fiat Chroma (194). The simplest upgrade for all rear disc rotor Delta platform vehicles is to obtain the Saab 16 inch rim mounting brackets, new larger ATE calipers and new ATE 302mm discs for the Saab 9-3 (YSF, 210HP) and install them. If you want to go really big, ATE does have a massive 345 mm rear disk using the 16inch rim calipers for the rears too, but once again the limiting factor is getting those rare Saab mounting brackets for rims of 17" diameter which determines ATE caliper placement and disc rotor size. The 16 inchers mounting brackets (called "holders" in Europe) can be had fairly easily from a foreign car junk yard or Saab parts suppliers; the 17 inchers are very rare birds in North America, but would be something well beyond the ordinary. Honeywell now owns Germany's Jurid (OEM supplier for many top European marks) and sells CE marked stock-size rear brake disks for the Delta platform vehicles including the Cobalts; see the Saab 9-3 YSF (210/220) listings. The US Bendix brand (also belongs to Honeywell now; used to be part of Allied Signal) has both front and rears for the NON-Brembo equipped Cobalts including the SS; use at your own risk! Of course, one can stick to the ATE (also known as Teves) discs for the rears as they are easily found. (For those that may be interested TRW bought out the old Lucas Girling brakes division from the UK. The only part of the former faded giant Lucas UK that still exists is Lucas Electric.)

Lucas? You mean the prince of darkness?