I suspect your theory might be correct. I have seen the same problem
with 200B struts and an even more severe with early 240K 40mm hub
height. As you say suspension wear can also come into it. I have
experience with 240K 270mm discs with backing plates slightly scoring
the disc which was due to either lower ball joints.
Craig.
Terry Rudd wrote:
>
> Simon,
> This problem comes up now and again on the list and as it seems like we
> haven't collected enough data or quite worked out exactly why it happens on
> some cars and not others to give you a precise "this is the way to fix the
> problem" type answer.
>
> I have a theory that it only happens when you use the 200B rotors that have
> the smaller hub height of 43.6 mm as opposed to the more common 48 mm rotors
> but it's only an observed hunch with little to back it up. I have never had
> the problem but one Datto that I saw that did actually had the 48 mm rotors
> but the tie rod end and the ball joints were absolutely rooted and that was
> the cause of the contact which was mainly occurring under heavy braking and
> not going around corners with a high load on the wheel. The front suspension
> was brand new on this car and there was no flex in this area so the control
> arm must have been moving outward under brakes. We replaced the worn
> components ($$) and then the control arm didn't even come into contact with
> the dust cover and if everything is in good shape under there nor should it.
>
> A lot of us grind the ends of the control arm which will usually fixes the
> disc scoring problem but I'm sure there is a more serious problem with the
> combination of components used or wear in other components that's not being
> addressed with that solution. Another thing is that a lot of us don't fit
> the dust cover and this exposes the disc to this sort of damage.
>
> The minimum thickness of the 200B disc is 10.5 mm. Unfortunately you could
> need quite a lot of replacement parts and have it checked out by a
> suspension place to get a second opinion if you don't know anyone that could
> do it for you - don't tell them anything, it's just in for a checkup -
> Pedders do a 28 point suspension check for $14 every now and again.
> Obviously you will need replacement rotors but 200B stuff is dirt cheap
> either at the wreckers or even in the local paper. You have to match the hub
> height of the existing rotors as there are 2 types and the callipers/pads to
> suite each type are slightly different.
>
> regards
> Terry
>
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