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So... do you know how to know how to recalibrate the accelerator pedal position sensor or not? I'm not buying the manual you mentioned because as soon as I get this thing fixed, they're selling it. And I need to get it done asap. I was looking for an answer to the question asked. 

uuuuuuuuuhhhhhhhhh..........what brackets? 1st generation rear discs prior to '94 don't make use of a bracket, the caliper is fastened directly to the rear knuckle casting...sooooooooo what have you got there?

After taking a closer look at the rear brakes it seemed someone only replaced the drivers side parts once upon a time and left the passenger side caliper and bracket original. So just to be sure I replaced both sides with all new calipers, brackets, ac delco pads, and hardware all greased up in the right spots. Then the P/S fluid started going foamy on me so I bought all new parts for that system and found...  One doesnt need to fish out and back in brand new P/S lines if the F`n pump to reservoir O-ring seal was the culprit all along... She's almost ready.            

My good man, honestly, you need this...... https://www.ebay.com/itm/236716370404?fits=Year%3A2008|Model%3AGrand+Prix&_trkparms=itmf%3D1%26aid%3D1110018%26rkt%3D12%26mech%3D1%26algv%3DCompVIDesktopATF2V6ReplaceKnnV4WithVectorDbNsOptHotPlRecallWithSiblingFilterCpcRecallsWithCiiQueryEmbedding%26pmt%3D1%26amclksrc%3DITM%26sd%3D167707521148%26sid%3DAQALAAAAEFEOJKTB8w2%2FUvCv%2B9BmnHc%3D%26itm%3D236716370404%26noa%3D0%26plcampt%3D0%3A161936924014%26algo%3DHOMESPLICE.COMPLISTINGS%26brand%3DChevrolet%26asc%3D20201210111451%26ao%3D1%26rk%3D2%26pid%3D101196%26b%3D1%26mehot%3Dnone%26lsid%3D100%26meid%3D031cf1d323cc45f48d590ca2cbbfb577%26pg%3D2332490&_trksid=p2332490.c101196.m2219&itmprp=cksum%3A236716370404031cf1d323cc45f48d590ca2cbbfb577|enc%3AAQALAAABYMJqCZOVY9EoLokt2QswX93oJfuGbORZEZhlCAjlXRRCUbpM9OMIdCmRfkOVQ1PhspDZGTlVp%2BsQFBtO93nb2QX5mVs4lL83nkIbUjqkMa8029EY4XfdhoaLjzTWK5DJUavttt5PoiOIedyWzJY%2FVuksmX506GdUxBoPT1LIWqjfWGejsfPdVITxAKzulOfMQQzvMopxvh020LIFxF%2F1RiyhTFtoeUf0kcPSfyaJp%2BqEsvlJmUmp6P%2B6ZXUDEhrqhuDWjXNRu9Vx3c77Hy1gWwqXTnGUWstmFy1WB81FxnZek%2BvwaLQ4bOU2dwUbV7kufOFF8gwiTc0VeOn%2B4MWaPd1p0%2BUGgIVKXXQHpuXpQgf0Cv%2Btjj2%2B3HQ49QVOK0A3yudeI2kPk%2BCNl8MQHkPLGnFgRvy9lzN5DGtFRlREpsF1GFQ%2Fv6N1%2FfSSN%2F4YIadnCydMbJTrQtw57KcYUXLBA4Q%3D|ampid%3APL_CLK|clp%3A2332490&itmmeta=01KQX3SJVJNPZ9BRW6D2YJV73Z if one wants to be able to diagnose & service their vehicles themselves it is invaluable. It's money well spent.

My grandkids '08 went into limp mode (reduced power) and I've been throwing parts at it to try to fix it. I installed a brake pedal position sensor and had it calibrated, but it's still showing reduced power, so I installed a new accelerator pedal. But after I did, the car's idle was crappy. It sounded weak and was revving up and down (not bad, but noticable),  so I figured I had gotten a defective new pedal and removed it and put the old one back on and the idling problem disappeared. While checking out videos on some other GP subjects, I came across one for resetting accelerator pedals by turning the key to accessory, slowly pushing the pedal to the floor and holding it for 10-15 seconds and letting it up slowly. But the guy said at the end of the video that each vehicle has it's own sequence for resetting, so I need to know if anyone can tell me the correct procedure for doing this on our 2008 Grand Prix 3.8. I want to try putting it in again and see if it will work correctly by resetting it, which I didn't do last time. Thanks for any ideas or comments. Lee