Question about 2004 BMW Z4
I 'm getting this high pitch screaching sound when slowly accelerating, it's not heard when no accelerator action or putting foot down pretty well. The noise is almost like a metal sharpening grinder. ANy advice or assitance most welcomed.
Hey- I have the exact same problem with my Z4 although its a 06 as opposed to an 04. I took it to the shop and was told it was break dust covering the break sensors. They removed my rear calipers and rotors, cleaned and greased the brakes. So far I havent had the sound again. Doesnt it feel so weird to be driving around with the top down on a nice day then slow down at a red light and be accosted with such a horrible sound like that? It drove me absolutely nuts. It went from a light sound only when I was barely accelerating (like trying to find a parking spot) to a bit of a scratchy metal sound which is why I think the problem may apply to you as well.
On a side note, I am also told by a friend of mine who is also a bimmer guy that it might be due to the brake pads vibrating back and forth inside the brake caliper. He suggests checking out a $2 investment in a product called Plastilube which will stop the noise. I did a quick search and you can purchase it by going to:
Posted on Apr 23, 2009
First I would check your fan belt, check to see if it is loose by pushing down on the the belt, should only be a slight movement. Look at the belt to see if it i shine if it is belt should be replaced. You can buy a can og belt dress, just spray on to belt on then see if you still get the noise. if you don't then you know for sure that its the belt. Keep us info about how this works,
Posted on Aug 23, 2008
Hi I have had the same prob with my 03 Z4 for nearly a yr now... initially got a main dealer recommendation that it was a cyclone valve.. then read on loads of forums that if this is suggested they are more than likely pulling a fast one!.. took it to a bmw specailist these suggested that it was the alternater belt pulley (not belt) this sounds logical as only occurs when engine is idling or slow enough for alternator to kick in.. was advised be about £275 for kit (belt and tensioners to fix).. havent doen this yet mind.
Posted on May 26, 2010
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