Looks like my question tagged onto a previous thread got missed out so
I'll ask again if no-one minds!
Ah, I have exactly that. Very slight if at all when accelerating
through 60 but braking from 70 down through 60 its very noticeable.
So what can I do about it...?
Have so far re-balanced the wheels and my next move was going to be
tracking then investigate the discs (in order of expense!)
I actually had this same issue with my 99' 528i. It ended up being a
combination of dead Control arm/ball joint and warped rotors. I had them
replaced and it drives like new again.
They said the "shimmy" was mainly from the warped rotors. I would start
Americans call discs rotors.
Automotive phrases are a minefield for our two divided version of
Manual gearbox/Stick shift (I think)
Automatic gearbox/ (No idea what American's call that... Probably
assumed unless stick shift specified!)
Air bag/Wife (sorry, just checking who's still reading!)
Actually, we alternate. I use both terms indiscriminately.
Also, 'decklid'. Note, too, that our cars have *never* sported 'wings'
other than those bolted to the rear decklid by Asian youths, unless
they were actually meant to fly. We cover our wheels with 'fenders'.
(Cringing): 'blinker' - but never from *my* lips! Occasionally,
Sometimes 'standard' transmission. 'Gearbox' is only commonly used
among the 'sportycar' crowd like SCCA and other assorted road racers.
Damn, completely forgot about them... But don't blame the Asian's, I
think you'll find that all your major motor manufacturers but huge
wings and fins on the back of cars in the 50-70's... The immigrants
are just a little behind the times, that's all!
And before you try to deny it, I know what a 1970 Plymouth Road Runner
Superbird looks like! :-p
There is a wonderful English to German translation sheet about for
when BMW took over Rolls Royce, I'll have to find it...
I had a manual box that turned into a slushbox.
Well that's what it felt like it was full of... It certainly didn't
have any gears left in there!
Depending on the mileage, you may need to replace the bushings in the
front suspension. When they get worn and sloppy it makes it very
sensitive to shimmy under braking such as what you describe. No brake
rotors are perfect. There will always be a small amount of variation as
the disk rotated through the calipers. The suspension needs to suck up
that small vibration without breaking into mecahnical oscillations.
First thing to check is that the wheels are meticulously balanced.
Many places don't do it accurately enough in mu opinion, and because
there are so many bushes, etc, on the e39 front end that can get tired,
even a slight imbalance on a wheel will cuase the shimmy.
I know when I had it I immediately suspected the front control arm
bushes, amongst other things, because that's what loads of people said.
However, it turned out that the alloy wheels (aftermarket) I had
fitted were sh*tty castings so the wheels could never be balanced
Changed the wheels, and everything's spot on now, even with the car at
nearly 80k miles.
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