Wheel and brake pedal shake

etx · 06-24-2016, 11:58 AM

Ok, dug into it last night.

On the driver side I checked the runout and found .020 on the rotor! Ouch! I removed the caliper and rotor, cleaned the hub with a scotch bright pad until it shined. Checked the wheel bearing as per the Timkin recommended process and found little to no play whatsoever. Turning by hand it is smooth and does not make any concerning noise.

I reinstalled the rotor, checked again. Got twenty thou again. I added marks at the highest and lowest points on the lateral runout. Removed the rotor and turned it on the hub by 90 degrees or as close to that as the lugs would allow. I checked again and still got 20 and the marks on the rotor still lined up so this tells me without a doubt the rotor is bad and the hub is fine.

Now I also moved the dial indicator to the other side of the rotor and checked it. I get the same amount of deflection on the inside of the rotor, also in the same direction. This tells me that the rotor is not straight, it is 'warped' as it it is not bulging. If the issue was pad deposits I would see a bulge, not a warp. Right?

I haven't tried the passenger side but it seems to be spinning freely so I'm focusing on the driver side right now. The driver side when free spun with the wheel on it seems to drag on the pad and slow down quite quickly.

etx · 07-02-2016, 09:33 AM

Another update. I replaced the driver side wheel bearing and the rotor now has 0 run-out. Also the roaring noise when I veer to the right on the freeway is gone.

Thanks everyone for all the input!

Silly Rabbit · 07-02-2016, 11:09 AM

Nice work on tracking down and fixing the issue.

JARblue · 07-02-2016, 11:15 AM

And thanks for following up

stansens · 07-05-2016, 05:04 PM

Make sure that the wheel lug nuts are torqued with a torque wrench in stages up to full torque and that they are tightened in the proper sequench. Changed many rotors that warped due to improper wheel nut tightening procedures.

RadioFlyer · 07-06-2016, 05:58 PM

Awesome, glad you got it sorted!

killrain · 08-03-2016, 03:44 PM

So the bearing was the culprit. Having similar issue, any braking from 40mph and on up causes shaking in the steering wheel, only on the drivers side. Best way I can describe it is, it feels as if the break pad is skipping, if that makes any sense. I was thinking wheel balancing, rotors or worse case scenario suspension components. There are no other symptoms though for me to think its a suspension issue. Now this has me thinking a wheel bearing. Ill have to get it looked at soon and do the spin test as you did.

07-02-2016, 09:33 AM	#2 (permalink)
etx Base Member Join Date: Apr 2016 Location: Detroit Posts: 43 Drives: 2010 370z PW M6 Rep Power: 11	Another update. I replaced the driver side wheel bearing and the rotor now has 0 run-out. Also the roaring noise when I veer to the right on the freeway is gone. Thanks everyone for all the input! SouthArk370Z, JARblue and Silly Rabbit like this.

07-02-2016, 11:09 AM	#3 (permalink)
Silly Rabbit Track Member Join Date: Sep 2013 Location: Brookston, IN Age: 56 Posts: 683 Drives: '12 PW Touring Sport Rep Power: 620	Nice work on tracking down and fixing the issue. __________________ NISMO R Tune Intakes \ Fast Intentions RHFC \ Borla CBE \ EcuTek Tuned\ SPL Camber Arms \ Powertrix Coilovers \ Swift Springs \ Avant Garde \ Wicked CAS \ Morimoto XB Halos \ Custom Fenders \ Hotchkis Sways \ NLP Splitter

07-02-2016, 11:15 AM	#4 (permalink)
JARblue A True Z Fanatic Join Date: Mar 2011 Location: Austin, TX Age: 45 Posts: 36,450 Drives: 11 Z34, 98 E36 M3 Rep Power: 2684442	And thanks for following up etx likes this. __________________ 2011 370Z 6MT Sport Gun Metallic \| ARC \| CJM \| Ecutek \| FI \| Fujimura \| R2C \| SPL \| Stillen \| TWM \| Z1 \| ZSpeed \|

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06-24-2016, 11:58 AM	#1 (permalink)
etx Base Member Join Date: Apr 2016 Location: Detroit Posts: 43 Drives: 2010 370z PW M6 Rep Power: 11	Ok, dug into it last night. On the driver side I checked the runout and found .020 on the rotor! Ouch! I removed the caliper and rotor, cleaned the hub with a scotch bright pad until it shined. Checked the wheel bearing as per the Timkin recommended process and found little to no play whatsoever. Turning by hand it is smooth and does not make any concerning noise. I reinstalled the rotor, checked again. Got twenty thou again. I added marks at the highest and lowest points on the lateral runout. Removed the rotor and turned it on the hub by 90 degrees or as close to that as the lugs would allow. I checked again and still got 20 and the marks on the rotor still lined up so this tells me without a doubt the rotor is bad and the hub is fine. Now I also moved the dial indicator to the other side of the rotor and checked it. I get the same amount of deflection on the inside of the rotor, also in the same direction. This tells me that the rotor is not straight, it is 'warped' as it it is not bulging. If the issue was pad deposits I would see a bulge, not a warp. Right? I haven't tried the passenger side but it seems to be spinning freely so I'm focusing on the driver side right now. The driver side when free spun with the wheel on it seems to drag on the pad and slow down quite quickly.

07-05-2016, 05:04 PM	#5 (permalink)
stansens Base Member Join Date: Nov 2015 Location: toronto, canada Posts: 146 Drives: 2016, 370z Rep Power: 194	Make sure that the wheel lug nuts are torqued with a torque wrench in stages up to full torque and that they are tightened in the proper sequench. Changed many rotors that warped due to improper wheel nut tightening procedures.

07-06-2016, 05:58 PM	#6 (permalink)
RadioFlyer Base Member Join Date: Aug 2014 Location: Los Angeles, CA. Posts: 193 Drives: 08 G37S S/C Rep Power: 41	Awesome, glad you got it sorted!

08-03-2016, 03:44 PM	#7 (permalink)
killrain A True Z Fanatic Join Date: Feb 2016 Location: san antonio tx Posts: 1,433 Drives: 2013 370z sport Rep Power: 349781	So the bearing was the culprit. Having similar issue, any braking from 40mph and on up causes shaking in the steering wheel, only on the drivers side. Best way I can describe it is, it feels as if the break pad is skipping, if that makes any sense. I was thinking wheel balancing, rotors or worse case scenario suspension components. There are no other symptoms though for me to think its a suspension issue. Now this has me thinking a wheel bearing. Ill have to get it looked at soon and do the spin test as you did.