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Knocking noise from a front wheel - second gen Prius - Page 3

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Posted by passerby on December 13, 2012, 4:08 am
 
replying to Elmo P. Shagnasty , passerby wrote:

Oh, boy! This sounds like one of those horror stories about a surgeon leaving
a scalpel inside a patient's body ...

I now think I should definitely take L.F.'s advice and rotate the wheel while
suspended and on neutral, all the while keeping your story in mind, too.

When I brought it into the dealership last time, I was mostly concerned about
break pads - had a pebble lodge itself in there on a different vehicle that
also made weird sounds. They seem to have been going under the same assumption
and perhaps didn't look for much else.


As far as the bearing failing, it would seriously suck indeed. I'm so not
looking forward to an expensive repair. However, there's one observation that
perhaps supports the bearings theory: the knocks seem to become louder when
the car is climbing a hill.  I can't come up with any explanation for that
which would include the wheel. The wheel is round - should make no difference
if the car's nose is slightly up.

Thanks!

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Posted by Michael N. LeVine on December 13, 2012, 1:51 pm
 


Have you had the wheel bearings checked?
--
Michael LeVine -  mlevine@redshift.com
"I can remember when a liberal was one
who was generous with his own money"
Will Rogers

Posted by News on December 13, 2012, 1:52 pm
 On 12/13/2012 8:51 AM, Michael N. LeVine wrote:

Brake binding?  Interference between rim and brakes or suspension?

Posted by lvw on December 16, 2012, 3:54 pm
 On Tuesday, December 11, 2012 2:08:01 PM UTC-5, passerby wrote:

A possibility that I think has not been mentioned: it's possible that you h=
ave a drive shaft joint going. A check for that is to drive in a tight circ=
le for a round or two. Do that in both directions. If a joint is going, the=
 problem will be a lot worse when turning sharply.

(I'd suspect a wheel bearing first, since you have checked the tires. Howev=
er, worthwhile to check the driveshafts too.)

Larry Van Wormer

Posted by passerby on December 16, 2012, 11:08 pm
 replying to lvw , passerby wrote:

Thank you for the suggestion, Larry. I tried a tight circle and it looks like
the knocking sound actually stops while in the circle, then restarts as soon
as I straighten the wheels. I did it in both directions, same thing. This
mystifies me even more, I have to admit. Still looks like more of a bearings
issue than anything else though - as the car shifts, there's perhaps more
pressure on a different side of the bearing?

Those driveshafts you've mentioned: interestingly, the one that goes to the
wheel I suspect is the source of the noise, is more rusted than the other one.
More rust=less oil? I mean, it's on the outside obviously and open to all
elements, so there should be some rust (and no oil), but I don't understand
why there's a visible difference in amount of rust between the two...

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