2002 Q45 vibrations only when braking

[q45inca]

Experts,

I'm getting strong front wheels vibrations when braking - feels kind of like ABS pulsations, but stronger and on any surface - always and only when braking. 120,000 miles. I've done all the obvious things - new rotors, new brake pads, new tires, balancing on the best machine (Hunter 9000), alignment check by one of the best shops in the area - none has made any difference. There appears to be no wheel bearing noticeable play and no suspension play - but I can not guarantee those.

Has anyone got similar symptoms fixed and how?

thanks

[yodawill2000]

Tension rod bushings blown ?

[q45inca]

How can I confirm that? Putting a pry bar somewhere? Where? thanks!

[yodawill2000]

You can tell if the bushing is blown just by looking at it. If its OEM you will see Silicon oozing out of it.

[bruce2]

You can visually inspect for dry cracks and leaks; in my case, thick jelly like oil hanging on the bushing. So I replaced the bushing.

I don't know if this would help, but you can also replace the sway bar links in case they are in bad shape. I recently replaced them and found the ball joins were really loose and the bushings were hard as pebbles.

[qship96]

Breaking? Or Braking .......two {too? to? } totally different things!

[q45inca]

Looking more into it, in 2002 the suspension design has changed and I don't see the same parts - what could it be in the 2002 design?

thanks

[q45inca]

Breaking? Or Braking .......two {too? to? } totally different things!

fixed the spelling now, something also could be breaking while braking, but I've meant braking. Those two/too/to/2 do sound the same, don't they?

[qship96]

Your vibration while braking really sounds like a warped rotor/hub problem.When you had new rotors installed,did the tech actually measure runout after installing them? Take it to a expert tech and have them measure total runout on all 4 rotors,should be inexpensive.

[q45inca]

That's exactly what I thought at first as well. I replaced the rotors myself and after that used a dial to check the runout - it was within the specs. I could take it to a real expert to check as well, but seeing exactly the same vibrations with 2 sets of rotors makes me think it could be something else.

Comparing to pre-2002 designs, those parts appear to serve the role of the tension rods mentioned above:

http://www.ebay.com/itm/INFINITI-Q45-FR ... a2&vxp=mtr

but that's only a wild guess....

[djwarner]

Brake pulsations are not uncommon with the 2002 models. Some have indicated that this is due to the thin wall disks used that year.

From experience, may I suggest you un-mount the wheel and verify the disk has some free play under the retaining clips. Then re-mount wheels and torque down the lug nuts as follows; tighten all nuts down finger tight, then using a torque wrench tighten the lugs nuts down to 30 ft-lbs tightening in a star pattern. Finally, increase the torque setting to the final value specified in the owner's manual again in that star pattern.

Can't hurt and may solve your problem.

[/209JOHN\]

Tension rod bushings blown ?

I have the same f50 Cima. 2002.

I see fluid oozing out of my bushings on the control arms. You know where to buy these?

thanks,

[xerexabante]

Did you just do the Front brakes?

You need to replace the rear pads and rotors as well.

[q45inca]

djwarner - I'll re-install the wheels when the weather gets nicer and see if it helps. xerexabante - I only replaced the front rotors/pads - how would the rear rotors cause the front vibrations? thx