Hi:

Yesterday I had new tires installed on my 1998 V70 (119K km). On the way home, the car started to make a loud noise from the rear. Sounds almost like a foghorn and appears to be harmonic. This sound starts after the vehicle has traveled a short (1-2miles) distance. I had a similar experience in the spring when I changed from snow to summer tires, so I know that the problem wasn't caused by the new tires put on yesterday.

I originally thought that the noise was due to rust particles getting into the brakes but am unsure if this is the case now. Today, I removed the caliper, rotator and disks. The rotator was a bit rusty, but both sides were clean as were the disks... so I conclude that the caliper is working OK. I cleaned everything up and then reassembled the disk assembly.... the noise was still there. We did learn that the noise appears to be coming from the caliper assembly; some vibration accompanies the noise. I backed the emergency brake shoe off was far as possible, I don’t believe that this is the source of the sound.

One thing I noted was that the pins holding the disks in place were very rusty. I thought perhaps this rust might be stopping the disks sliding and perhaps causing the noise, so I removed the pins and cleaned them as well as I could. They are pitted somewhat but clean. I intend to reassemble the brake assembly and retry. I would like to put a bit of some type of lubricant on the pins to see if this will help..... Any ideas about what type?

Has anyone experienced and fixed a similar problem?? Any ideas out there about what's happening??

Thanks,

JohnR