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Old 01-16-2020, 12:27 PM
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hawretre hawretre is offline
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Join Date: Nov 2019
Cobra Make, Engine: Backdraft #1799 5.0L Gen 3 Coyote
Posts: 21
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Default Brake Rotor Runout

I noticed that my right rear wheel was getting hot. I initially thought that the emergency brake might not be completely releasing. But after lifting the car and rotating the wheel I discovered the the brake was dragging on one particular area of the rotor.

I pulled the wheel and brakes and measured the runout on the rotor at 0.0055". I then pulled the rotor, rotated it as close to 180 degrees as I could and remeasured the runout - still 0.0055". However the point of highest runout stayed at the same spot on the pin drive and not the rotor. Then measured the runout on the pin drive - 0.0021". I didn't do the math but that seems to be consistent with what I'm seeing on the rotor.

I have not pulled the pin drive as of yet. Has anyone seen a similar issue? It appears to be the pin drive or axle.

This BDR #1799 with the newer pen drives - single bolt attachment. Any idea of the torque spec on the pin drive bolt?
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