grinding rotational noise from rear

[c19rch]

Hi guys.
so strange one. 55 plate diesel tourer. Occasionally (not all the time) I get a rotational grinding noise below 30 mph. It speeds up as speed increases. Then above 30 mph it goes.
Or it might not be there at all..
Any ideas??
Was thinking a shoe delaminated? ? Or something in the drum??
Has anyone had anything similar??

 

[edgeoftime]

I found a hard pebble lying on the caliper, for the life of me I cannot think how it held on in there, it sounded like the suspension was about to cave in.

 

[Jon_G]

I get this after the car's been standing a while, but it quietens down after a bit of a drive... I have ***umed it's corrosion at the disc edge catching the pad?

 

[vile]

As Jon said it's probably just surface rust on the disks.
When you drive the car a few miles it will wear off.

 

[c19rch]

Thanks guys.
It's definitely not surface rust.
I only say that because I've done 500 miles in last two days and was still doing it on way to Newcastle after a 240 mile round trip. Dropped the govner off at home then drove home and it had stopped. It's strange.
Grinding clunky sound... rhythmical.

 

[c19rch]

I'm thinking it's time to replace the rear disks as they past there best.
Trust me to have a special problem.. haha

 

[vile]

Probably a stone in your metal disk shield then.
Take the wheel off and inspect for this as its will make a harble noise iv had this once myself.
If not then your caliper could be sticking