QX70 brakes vibrations at high speed

A forum for lovers of Infiniti's hot-rod crossover, the FX! In 2014, all FX models will be named Infiniti QX70, in line with Infiniti's new naming structure.
quintard
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Car: Infiniti QX70 3.0D

QX70 brakes vibrations at high speed

Postby quintard » Tue Aug 04, 2020 11:00 am

hi,
i am french and forums are very poors in france for infiniti cars.
i have vibrations in brakes at high speed.
i want to know if it is a current problem on QX70 or others infiniti cars.
can you help me
Dany


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Ilya
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Car: 2011 M56x but I spend a lot of time on my 2015 Kawasaki Vulcan S. Former owner of a 2007 M35x. Also take care of my wife's 2016 QX60.
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Re: QX70 brakes vibrations at high speed

Postby Ilya » Tue Aug 04, 2020 12:22 pm

Welcome. You probably have warped rotors if it only happens under braking. Either have them re-surfaced or change the rotors (and pads). In the US, you can get a set of 4 rotors and 4 sets of pads for under $200 USD for a Q70.

Also, moving this to the correct forum.

quintard
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Car: Infiniti QX70 3.0D

Re: QX70 brakes vibrations at high speed

Postby quintard » Tue Aug 04, 2020 12:49 pm

j'ai du mal a y croire car je ne freine jamais tres fort.

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ibc
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Re: QX70 brakes vibrations at high speed

Postby ibc » Tue Aug 04, 2020 7:45 pm

I agree withe Ilya, This is a symptom of warped rotors, or inconsistent thickness of rotors. Your rotors must have worn irregularly, somehow. Perhaps the steel was softer in places, and a bit harder in others? It happens. You can resurface them to make them uniform again, or else just replace the rotors with new ones. They're pretty inexpensive in USA, so we usually just replace them, which fixes the problem instantly.

madmanpauly
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Re: QX70 brakes vibrations at high speed

Postby madmanpauly » Wed Aug 05, 2020 7:30 am

Driving through puddles with hot brake rotors can easily warp the rotors as well. Hard braking is not the only cause. I would have the rotors resurfaced or replaced. It's not a difficult procedure if you have any mechanical skills you could do it yourself.

quintard
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Car: Infiniti QX70 3.0D

Re: QX70 brakes vibrations at high speed

Postby quintard » Wed Aug 05, 2020 2:40 pm

petites indications:
1ere chose: j'ai fait remplacer le liquide de frein récemment parce qu'il était ancien.
2eme chose : pendant le confinement du covid, le véhicule n'a pas roulé pendant 2 mois et les disques ont rouillé.
je ne sais pas si cela a pu avoir un impact

madmanpauly
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Re: QX70 brakes vibrations at high speed

Postby madmanpauly » Thu Aug 06, 2020 7:54 am

Shouldn't impact anything but good to keep up with fluids. I'd focus on brake rotors. Let us know how it goes.

ghbsgFX30
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Re: QX70 brakes vibrations at high speed

Postby ghbsgFX30 » Mon Mar 01, 2021 9:15 am

Hello,

Is it akabono brakes? If it is this is how to solve it. Change, discs, pads, shims and spiders. and ALSO change lock sprints and bolts to the calipers.
Get out and drive and enjoy! The akebono lock pins for the pads through the calipers have poor quality. The surface rust and crack and dont let the pads flex in the way they should so the discs get warped and You get vibrations.

quintard
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Car: Infiniti QX70 3.0D

Re: QX70 brakes vibrations at high speed

Postby quintard » Mon Mar 01, 2021 10:01 am

i dont understand very well, can you explain ?

quintard
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Joined: Sat Jun 03, 2017 8:31 am
Car: Infiniti QX70 3.0D

Re: QX70 brakes vibrations at high speed

Postby quintard » Thu Jun 17, 2021 2:13 pm

i have changed rotors and problem is the same.............

quintard
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Car: Infiniti QX70 3.0D

Re: QX70 brakes vibrations at high speed

Postby quintard » Sun Jun 20, 2021 7:43 am

Something new: it vibrates also when I brake with the foot brake (manual), which, if I am not mistaken, is on the rear wheels, which pushes the front discs apart, the rear discs have already been changed as a preventive measure. it would therefore be more of a transmission problem. What do you think ?

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VStar650CL
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Re: QX70 brakes vibrations at high speed

Postby VStar650CL » Sun Jun 20, 2021 8:04 am

Driveshaft maybe, check your U-joints. They change inertia when you transition from throttle to brake.

quintard
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Car: Infiniti QX70 3.0D

Re: QX70 brakes vibrations at high speed

Postby quintard » Sun Jun 20, 2021 1:41 pm

yes, it's a good idea. is it possible to have plans/pictures of mecanic implantation ?

quintard
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Car: Infiniti QX70 3.0D

Re: QX70 brakes vibrations at high speed

Postby quintard » Tue Jun 22, 2021 2:10 pm

seen with my mechanic this morning: abnormally large play on the central support bearing of the transmission shaft. FYI, it vibrates by activating only the rear brake, so I have a doubt that it is the front discs, as you say. and the rear discs are new.


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