I have a loud rattling noise that comes from my left rear wheel area when I
go over bumps or rough areas in the road. The rougher the road the louder
the rattle, but mysteriously the rattle disappears if I have the brakes
pressed even slightly. Does anyone have any speculation as to what this
might be? I can't imagine what would cause it not to happen if the brakes
are applied. Thanks in advance! I have a 1994 325ic.
I'm gonna go out on a limb here, you have worn suspension bushings, and when
you apply the brakes the noise goes away because you are efrfectively
binding the suspension against the 4000 pounds of vehicle.
If the vehicle is moving forward, and the brakes are applied, then the
suspension is going to be pulled rearward and it will bind against the fixed
points of the undercarriage. When you release the brakes, the suspension can
flop around unrestrained, and you hear this as a rattle. Replacing the
suspension bushings should solve your complaints.
My 1997 528i made the same noise. I found out that the little tangs on
the back of the brake pads were not bent out enough to prevent them from
rattling against the pistons and calipers. A few minutes with a pliers
at each caliper fixed it.
Ack!! I just reread the OP and sure enough he said the noise was coming
from the wheel area. I thought he said it was coming from the rear as
in the shock mounts. If it is in fact a rattling and not clunking I
would also suspect the brake pads are flopping around in the calipers.
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