Very loud growling noise after motorway driving now it has gone worse - collision prevention lights on

[platforminc]

Hi All.

I have had this issue with my car whereby after long motorway driving circa 50 miles plus, when driving on lower speeds or reversing, there is a loud growling noise similar to when 2 metal bits are grinding against each other.

Yesterday, after driving 100 miles on the motorway, it has gone worse. driving the car feels like there is something underneath the car dragging on the floor, but whenever I check there is nothing rubbing against the road and 2 metal bits grinding on each other, its so loud and so bad that I do not feel comfortable driving the car, also I have the collision prevention assist plus inoperative error, my scanner does not pick it up, and the scanner of a garage I went to recently doesnt pick it up either. I recorded the issue on my phone as I previously informed my indy specialist during the last service, but as the problem is only reproducible after a long drive, i could not reproduce it at the time, now it happens even with non-motorway driving.

Lastly, I last changed my pads about 2 years ago, I did this myself and I am just wondering whether I fitted them incorrectly and hence the issue.

 

[Blobcat]

I’d get it up on axle stands, take the wheels off and have a look for witness marks to see if anything is catching. I’d spin the hubs round by hand to check they're free to rotate.
Are the wheel speed sensor / reluctor rings rusted up and catching?

 

[ioweddie]

propshaft?

 

[LostKiwi]

Check the dust shields behind the discs. If they're corroded and weak they can flex against the disc and rub then slowly get pushed back.

 

[alexanderfoti]

If not above, possibly a wheel bearing getting bad! If it is doing it all the time, best to get it to the workshop to check it ASAP.

 

[platforminc]

Thanks everyone for your concern, I took it to an indy this morning. I called later in the day and was told that the hub and one other thing had broken, and some axle stuff needed to the replaced also.
As I was driving during the call, I was unable to write anything down. Hopefully I will get further details tomorrow.

As with the Collision Prevention Assist Plus inoperative on the dash, what can this be ? Two non mercedes scanners were unable to read the root cause, could it be related to this noise thing ?

 

[platforminc]

Took the car to an indy, and sadly its not good news. There are a lot of problems.

ABS sensor - This is the root cause of the collision prevention assist plus errors
2 wheel hubs are bad
1 steering knuckle
There's some kind of play with the front tyres, not sure what that means.

 

[platforminc]

From the diagram attached, can anyone please guide me on which is the knuckle and which is the bearing, which is the hub. You can please reference the numbers.

 

[alexanderfoti]

30 is bearing kit, comes with hubs.

Assume track rod ends when they say knuckle? If so, not on diagram.

 

[platforminc]

30 is bearing kit, comes with hubs.

Assume track rod ends when they say knuckle? If so, not on diagram.

Thanks for this, I believe the knuckle is no 10. Please confirm.
Also, if you look at the attached picture, what part is this please ?

 

[alexanderfoti]

Yup looks like it! That wheel must have been close to falling off its its damaged the spindle!