HI,
when I push at the 10 o clock position of my rear left wheel, I can feel a knock.
I tried to locate the faulty part, but failed after 1 hour of knocking..

I there a good method to locate the faulty part ?

 

You need to remove the roadwheel, and preferable get the car up on a ramp so all the suspension joints can be checked for wear. There are a lot of joints in the rear suspension, (it has upper and lower wishbones), plus there are the roll-bar linkage joints too.

How many miles (or kms) on the car ?

 

Also, you might elevate the vehicle with wheel on, (and by doing so, unload the weight of the vehicle from the wheel bearing) and hands at 6 and 12 on the wheel, and see if the wheel bearing is your cause.

 

HI,
my car has 100.000km now, but it's built in 2003..
I jacked the car with the spare wheel mounted.

There's no knock when toggling at 3 o clock.. this only occurs from 8 to 12 o clock.
I put my hands on various parts of the suspension, but I didn't find where the knock occurs.
( The outer edge of my wheel moves about 1mm, so you cannot see anything moving..)
My other wheels don't knock this way..

 

Hi nebelfuerst,

An inexpensive mechanic's stethoscope might help you locate the source of the knock. Areas I would check first would include the outer CV joint nut (has it loosened for some reason?), the CV joint itself, the hub bearing, the hub carrier shield and brake disc shield, the stabilizing link ends, and the brake pads.

Beyond that, you basically have to listen to every joint in the suspension....

Please keep us informed!

Don

 

FYI. Wheel bearings are preloaded and should not have any discernible play.

 

You can also use a heavy ball peen hammer, hitting the tire in various places while it's jacked up.

Check out this video. Focus is on the front end in this particular video. The guy is a good mechanic and his advice is usually car model agnostic. Check around the 11:20 mark in the video to understand what I'm suggesting.


He has other videos and his own web site where there are several videos on noises. I hope this helps.

 

Hi,
thanks for the hints.. I ordered a stethoscope to get this knock located..
I'll keep you updated.

 

So I bought a stethoscope and jacked my car.
I improved my way to produce the sound: I don't need any wheel, just pushing the caliper.
From this point I can exclude the bearing.

With my stethoscope I listened to every suspicious point, but I did't hear a difference, just a deep knock.
What makes the difference if I would listen to a defective part directly ?