Rubbing noise from rear

Jaguandy · Post by **Jaguandy** » Sun May 21, 2023 11:12 pm

I've noticed recently a fairly faint rubbing noise that appears to be left rear. Rub rub rub at maybe three times the speed of wheel rotation is my guess. Only noticeable on quiet tarmac around 30-40 mph. It seems worse when cold, and seems worse on right hand bends. I expect it'll be hard to find out what is causing it, but wonder if anyone on here has a clue. Rear diff was replaced a year or so ago, if that matters.

scm · Post by **scm** » Mon May 22, 2023 12:34 am

Brake pad?

AJ13 · Post by **AJ13** » Mon May 22, 2023 5:59 am

scm wrote: ↑Mon May 22, 2023 12:34 amBrake pad?

Agree....brake pad would be my first thought

Jaguandy · Post by **Jaguandy** » Mon May 22, 2023 9:14 am

It's not a continuous rubbing noise, but rub rub rub roughly three times per wheel rev. Wouldn't brake pad usually be a continuous noise? Thanks for the suggestions so far.

AJ13 · Post by **AJ13** » Mon May 22, 2023 12:02 pm

Not if it's rust on disc edge, part way around.
This would only catch at certain point.

Jack car up....spin the wheel..

cj10jeeper · Post by **cj10jeeper** » Mon May 22, 2023 1:00 pm

Jaguandy wrote: ↑Mon May 22, 2023 9:14 am It's not a continuous rubbing noise, but rub rub rub roughly three times per wheel rev. Wouldn't brake pad usually be a continuous noise? Thanks for the suggestions so far.

Same if it is multiple pad deposits on the disc you'll get multiple high spots.
I'd do the standard disc clean routine of quiet road at 60 brake hard to near zero, but not stop, repeat 2 more times (3 cycles) then drive to cool the discs.
If it still does it get a dial gauge on the discs to check they are not out of true. Both next to zero costs as opposed to someone just suggesting new disks and pads.
If no joy only then start to worry about other things like the diff.

As an aside a deep vibration in my former Evoque that sounded like rear diff. or a driveshaft turned out to be a warped disc with 4 high spots. Rare so I was sceptical but replaced and all was well.

AJ13 · Post by **AJ13** » Mon May 22, 2023 2:21 pm

Is there much of a lip around disc edge.
My previous M3 was terrible. Rust appeared only after a few days sitting idle, more like a crust around outer disc edge where pad doesn't touch....maybe something as simple as that.

If my wheels are off on any car, I normally use a small ballpin hammer and tap around edge of disc ....depending on quality of discs/car, the scale just flakes off.

elugelab · Post by **elugelab** » Mon May 22, 2023 4:53 pm

The sound isn't consistent with it but the fact it gets worse when turning right would be symptomatic of a wheel bearing - greater load on the left of the car round the corner will make the noise of a bad bearing louder.

As others have said, jack the car up (with chocks!) and spin the wheel to see if you can replicate it. That will probably reveal the issue.

mickjaguar · Post by **mickjaguar** » Mon May 22, 2023 8:49 pm

I've had rumbling noises on cars where potholes have turned the inner rim into a 50p piece! Also a tyre where the tread had become mis-shapen. This was hard to spot until the wheel was off the car and when rolled along it wobbled slightly side to side. Swap the wheels side to side to begin with and see if the noise moves.

JekVI · Post by **JekVI** » Tue May 23, 2023 4:16 pm

My first thought would be brake pads rubbing (with uneven wear), or maybe one of the guards behind the disc having something softer than a stone caught in it?

I had a rubbing noise from one rear wheel once and I believe it was one of the handbrake spot callipers (which I believe are only on ceramics) stuck partially on - stopped immediately, cycled the handbrake and hasn't happened since.

Rubbing noise from rear

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