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1998 540i squeals like air being let out of a balloon

2K views 4 replies 3 participants last post by  Penngwyne 
#1 ·
My 1998 540i makes a strange sound, usually starting once the car reaches 30mph. It's a high pitched squeal, sort of like letting air out of a balloon.
It's coming from the front end somewhere (sort of sounds like its underneath the car), though difficult to pinpoint because it doesn't make the noise while idle.
Any thoughts?
 
#5 ·
I had this problem on sons 525i (except for the braking bit which makes it different)

Put duct tape from the windscreen over the top of the grill below the wipers.
The grill vibrates and makes horrible noise which gets worse in a headwind.
The noise was really loud too.
Permanent solution would be to pack the grill with some rubber strips maybe?

If that doesn't work maybe what Brett said or check wheel bearings?
 
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