Vibration - rotors or tires?

shadonoz said:

Most likely balance. Most rotor problems show up when you're braking, not cruising.
Did you drive >65 any time after the balancing and before the fluid change? If not, there's no reason to correlate the vibration with the fluid change.
I'd have the balance rechecked at someplace other than Costco.

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bmninada said:

That's the issue between balancing and rear diff. change did not really drive long distance. Anyways just came back from Costco. They re-balanced all tires and the notes read:

Cust. complain: Car shake noticed at high cruising speed.
Re-balanced all 4 tires / 100% balance was off / Stick residue visible / no weights / Possible cold weather or / manually or /accidental tear off. No rotation performed.
Trend depth 5/32 remain / tire pressure as per specification / no reset request to be made to customer.
Wheel condition excellent, zero scratches/dents.
Re-torque request at 25 miles.

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yugrus said:

Yep, lost some weights. It's too much to ask the technician to wipe the wheel surface with brake clean or alcohol before sticking the weight on. Who does that anymore anyway...

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bmninada said:

This is something new: After changing the rear differential fluid (dealer replaced) I had to go on a 5 hr. drive. When I drive at or above 65 mph my steering wheel vibrates with the vibration increasing with speed of the vehicle.

At lower speed - nothing. When braking not abruptly (emergency) but coming to a stop - nothing, no vibration.

I am leaning towards tire balancing but the caveat is my tires were balanced relatively recently (about 3 weeks back @ Costco warehouse). The worst case would be wrapped rotors but in which case every dealership is charging very heavily and saying re-surface may not work due to allowed depth and there's no way to figure out which axle. Also, they are saying even if re-surfaced, I must opt for new pads although my current pads have 50% life remaining (they confirmed).

At this point - not sure what I should do?

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GSP2085 said:

Having the same problem with my 2 wk old GS FWD. Posted in the lounge:

Picked up my new CX-5 GS FWD 2 weeks ago and have noticed this issue. I first noticed it on the test drive on the freeway but thought it was the road. Then on the 60 miles trip home (shopped out of area for best deal).

A few freeway trips later and I've concluded it's a problem. Once I get above 55 mph, I get vibration in the steering wheel, seat and I can feel it in the foot pedals ie. accelerator. I googled it and sounds like the wheels need to be balanced. Not sure if its an alignment problem as it does not pull to either side, drives perfectly straight. Speeds under 55 it drives just fine, no vibration.

Anyone else ever had this problem? How does this happen on a brand new car? I'm assuming a Mazda dealer will fix it under warranty?

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