Kim Haun
Supporter
Whenever I find myself scratching my head, I go to this forum and the incredible wealth of info that you all share so graciously never fails to enlighten. I've been doing some fine tuning on my RCR GT40 and have come across an issue with brake rotor run-out. The last time I drove the car I had a bit of vibration at the steering wheel when braking. I put a dial indicator on the rotors and found 3 of the 4 out of spec....over 3 thousandths. I turned all the rotors and solved the run-out on all but the front left. After turning the rotor I torqued the hub down with a steel spacer in place of the knock off adapter and the run-out is within spec. However, when I installed and then torqued down the adapter I got an 8 thousandths run-out at the rotor. Suspecting the knock-off adapter, I called Bob Lacey at Vintage Wheels, told him what I was finding and he graciously volunteered to send me a new adapter free of charge, even though the adapter I had was made back in 2006.(The RCR kit I purchased was originally bought by someone who did not build the car over a 10+ year period.) I received the new adapter, torque it down and I'm still having the same out of spec run-out reading. All the parts have been inspected for anything that could be causing this issue, rust, paint etc. I even marked the hub and adapter and rotated them 180 degrees to each other and still had the same readings. The front hubs are brand new and I don't have the issue on the right side. And I have to assume the new adapter is fine. Has anyone had a similar issue and found a way to correct it? Or perhaps someone can suggest what I'm missing here. I have attached a photo of the assembly with the steel spacer torqued on in place of the adapter. Assembled like this there is only 2 thousandths run-out...installing the new adapter, it goes to 8. WTF!
Thanks for your advice.
Kim
Thanks for your advice.
Kim