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Front rotor balance

Front rotor balance

Postby Matthewsteven1989 [OP] » Dec 02 2019, 7:01pm

Alright guys, back again. 07.5 sierra z71. Vibrations above 60 mph and seem to get worse in the steering wheel the faster you go. EVERYTHING has been replaced in the front except brakes and rotors. New tires, same issue, new wheels and tires, same issue. New u joints, driveshaft checked. New cv axles but i dont like how the chevy cv axles have play in them... can the brake rotors be out of balance? I'm at a loss now...
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Re: Front rotor balance

Postby MIKE91B » Dec 02 2019, 8:58pm

It is possible for the rotors to be out of balance but I have never seen a case where that caused a vibration. I have seen lateral runout cause vibrations. This is usually extremely warped rotors. Vibrations are always tough to diagnose over the net but it looks like you have replaced all the usual suspects.
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Re: Front rotor balance

Postby Matthewsteven1989 [OP] » Dec 02 2019, 9:11pm

Its definitely not a warped rotor bc it doesnt shimmy and doesnt get worse when I hit the brakes.

I'm curious if it may be the strut bushings. I replaced them with new ones from rock auto but I've noticed with the weight of the truck on them at ride height the bushing in the lower mount at the control arm so soft that it pushes out and the block that bolts to the control arm isnt centered but is at the top side. I'll post a pic
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Re: Front rotor balance

Postby Matthewsteven1989 [OP] » Dec 02 2019, 9:12pm

The lower strut mounts
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Re: Front rotor balance

Postby plant.one » Dec 02 2019, 9:15pm

it seems like you've been chasing this vibration stuff for a while now...


i havent gone thru all your back posts...but there seems to be a history of numerous problems potentially causing issues with this truck being a paint shaker.

have you had it into a professional mechanic or god forbid the dealership for a diagnostic yet? paying someone $100 to diagnose this for you hands on once and for all may end up saving you hundreds of dollars in useless wasted replacement parts. just something to consider.
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Re: Front rotor balance

Postby ferraiolo1 » Dec 02 2019, 9:17pm

So did you ever replace your worn diff bushing or throw a diff drop in it?

Why do people keep making new threads for the same issue. All the facts and info keeps getting lost.

@ricka combine all of them


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Re: Front rotor balance

Postby MIKE91B » Dec 02 2019, 9:31pm

Well then you need to have a qualified NVH (noise vibration and harshness) technician look at it. The PICO scope will need to be used to determine what frequency the vibration is at and then it can be traced by magnitude. Your best bet is to stop guessing as it will only cost you more money. Time to diagnose this the scientific way.
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Re: Front rotor balance

Postby Matthewsteven1989 [OP] » Dec 02 2019, 9:37pm

plant.one wrote:it seems like you've been chasing this vibration stuff for a while now...


i havent gone thru all your back posts...but there seems to be a history of numerous problems potentially causing issues with this truck being a paint shaker.

have you had it into a professional mechanic or god forbid the dealership for a diagnostic yet? paying someone $100 to diagnose this for you hands on once and for all may end up saving you hundreds of dollars in useless wasted replacement parts. just something to consider.



I dont know of any place around here in south Arkansas that has the equipment or even smart enough to diagnose this... that's why I haven't
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Re: Front rotor balance

Postby CritterGitter » Dec 02 2019, 9:42pm

Just because you don't know of a place doesn't mean its not out there with some amount of "acceptable proximity"... Do some research on NVH qualified shops and see if there is an option. As many have stated, you don't want to continue to spend money on replacement parts that aren't the issue.
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Re: Front rotor balance

Postby MIKE91B » Dec 02 2019, 9:54pm

GM dealerships have NVH techs. I have the training but without the vehicle and the tool I’m of no use. Take it to the dealer and explain what you have done and what the problem is. Tell them you want them to perform a test with the PICO scope and if they look at you with crazy eyes find another dealer.
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