Whistling Noise When Driven Over 20 Mph!

[Tricky micky]

Hi, 2001 is200 se nav making a whistling noise when driven over 20mph, soon as i go below 20 mph it stops. Iv put new discs and pads on and checked nothing touching or rubbing the disc either. Also no difference in noise when i apply the brakes. Checked alternator belt and thats fine, really doing my head in. Noise sounds like its coming from the front drivers side, anybody had same problem???? Any help would be great

[steve2006]

Could be a vacuum leak,check all the pipes for splits and security.

[Tricky micky]

Already have checked for all leaks, it sounds metalic if u get what i mean. Seems to be a bit louder when its colder though if that makes a difference to anyone, thanks for your help

[Rich OB]

I have the exact same problem on my '01 IS200. It could possibly be one of two things.

Either a caliper is sticking, usually one of the front ones. Or it could be the handbrake shoes. On my car it's the front near side caliper that is sticking, you will only hear it when the car is at low speed.

Apparently the rear handbrake shows can wear and become a little lose with age, it's worse on a damp or cold morning. That might explain the noise and why you can't see nothing.

It may be neither but hopefully it'll set you in the right direction.

[awnield]

I had this problem, and i hate to say it but it turned out to be a front wheel bearing.

As an aside, if was these worn bearings which kept causing my discs to warp resulting in the dreaded judder...

[Tricky micky]

I suppose that would make sense, i do av a little wheel wobbly, will try a set of bearings and see if this fixes tge problem, will let all no