Checking rotor runout on rear (hard to turn)
05-13-2002, 02:25 PM
#1
Racer
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St. Jude Contributor
Checking rotor runout on rear (hard to turn)
My front two will spin easily, but with the car in Neutral and the parking brake off, the back two are really difficult to move. It moves, but it feels like the parking brake is on. This happens without the rotor on, so I know its not the e-brake. I know its connected to the rear-end gears and all, I just don't know if its normal for it to be hard to turn, especially when checking for runout?
05-13-2002, 03:35 PM
#2
Tech Contributor
Re: Checking rotor runout on rear (Marc78)
You will get a very jumpy indicator needle unless you disconnect the 1/2 shaft so you just spin the rotor on the bearings. Also could the parking brake be dragging?
Gary
Gary
05-14-2002, 11:25 AM
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Re: Checking rotor runout on rear (Marc78)
When the rear wheels hang down the universal joints bind causing the wheel to jump. This is the reason not to jack the car up, let the wheels hand down and but it in gear with the motor running. A simple filing or grinding in the certain spot on the inner universals will stop this. The outer universals don't seem to hit but look at a old universal from the center and you will see where it hits. A light clean up with a file will alleviate this problem. You could also jack under the shock mount to prevent this binding.
05-14-2002, 06:21 PM
#5
Melting Slicks
Re: Checking rotor runout on rear (Marc78)
Sounds like you have already received good advise from others.
Just thought that I would add that I was able to go from .010 to .002 runout using aluminum from a Dr. Pepper can. Just takes a little trial and error time while placing the aluminum between the spindle flange and hub until you get results that you can live with.
Just thought that I would add that I was able to go from .010 to .002 runout using aluminum from a Dr. Pepper can. Just takes a little trial and error time while placing the aluminum between the spindle flange and hub until you get results that you can live with.
