Logan Posted August 30, 2008 Report Share Posted August 30, 2008 I've noticed some factory balancing marks on some new GM rotors I've seen. Do front rotors really need to be balanced? Well yes. That being said. How much effect? One site claims a 3/4 oz out of balance rotor can cause a 1st order vibration. I have not gotten that far yet. What was interesting. Was the weight variation on aftermarket rotors. I was figuring 15 lbs per rotor. It appears to be more. I dont have the brand names available. But here is a quick weight chart of what I'm seeing online. Standard brakes non heavy duty J55 brakes. 1998 and 2000 newer FWD Cadillac. 19.7 19.8 18.0 18.0 17.0 19.5 22.0 These are shipping weights. May not be correct. But that is pretty wide margin 17.0 to 22.0 lbs. 5 lbs difference? You would feel that in the car under sprung weight. More to come. Logan Diagnostic LLC www.airbagcrash.com www.ledfix.com www.ledfix.com/yukontaillightrepair.html www.ledfix.com/ledreplacements.html www.ledfix.com/j42385toolrental.html Link to comment Share on other sites More sharing options...
Bruce Nunnally Posted August 30, 2008 Report Share Posted August 30, 2008 I love fact based research and analysis. Bruce 2023 Cadillac CT4-V Blackwing Follow me on: Twitter Instagram Youtube Link to comment Share on other sites More sharing options...
Cadillac Jim Posted August 30, 2008 Report Share Posted August 30, 2008 I wonder, how many people know to match and balance new rotors before installation? -- Click Here for CaddyInfo page on "How To" Read Your OBD Codes-- Click Here for my personal page to download my OBD code list as an Excel file, plus other Cadillac data -- See my CaddyInfo car blogs: 2011 CTS-V, 1997 ETC Yes, I was Jims_97_ETC before I changed cars. Link to comment Share on other sites More sharing options...
Logan Posted August 30, 2008 Author Report Share Posted August 30, 2008 I wonder, how many people know to match and balance new rotors before installation? Can you explain? Logan Diagnostic LLC www.airbagcrash.com www.ledfix.com www.ledfix.com/yukontaillightrepair.html www.ledfix.com/ledreplacements.html www.ledfix.com/j42385toolrental.html Link to comment Share on other sites More sharing options...
Logan Posted August 31, 2008 Author Report Share Posted August 31, 2008 I hope Jims_97_ETC can offer more info related to: "I wonder, how many people know to match and balance new rotors before installation?" Tell us more.. Logan Diagnostic LLC www.airbagcrash.com www.ledfix.com www.ledfix.com/yukontaillightrepair.html www.ledfix.com/ledreplacements.html www.ledfix.com/j42385toolrental.html Link to comment Share on other sites More sharing options...
Ranger Posted August 31, 2008 Report Share Posted August 31, 2008 That left me scratching my head as well. Link to comment Share on other sites More sharing options...
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