Re: (1) Rear Rotor Replacement XJ6 Series 3

[Kyle Chatman <kchatman@mail.coin.missouri.edu>]

>> From: Kyle Chatman <kchatman@mail.coin.missouri.edu>:
>> I replaced one rear rotor because of physical damage during an unrelated
>> repair and I replaced the damaged rotor with an after-market variety (not
> >sandwich).

>From: Kirbert 
>The rear rotors on the XJ-S are described as "externally damped".  They have 
>an iron ring in a groove around the outer edge, trapped but not attached so 
>it can rattle, and if you grab it with your fingers you can slide it around 
>the disk.  I would presume that this thing would be fairly effective at 
>preventing some types of sounds from the brakes.  However, it does MAKE >some sounds -- if you stand next to the parked car and bump it, you can
>usually hear the things clang around a little.
>Does this feature have anything to do with why the stock rotors are 
>sandwiched?  Do the after-market non-sandwiched rotors also have this >feature? 
> And if not, will it be missed?
I ordered disks from 2 suppliers and neither came with the iron ring. I returned
the first thinking it was an error but kept the second assuming that the old
type was not available. Good question about sound dampening. I have no idea
whether it will make a difference. My concern was whether the thermal
properties might differ to the point of causing uneven braking. I assume that
if the surface were good, then the initial application of brakes would be fine. My concern was that one type or the other might retain heat very differently. I 
didn't realize that the band was only a ring. I thought that the disks were
made as a sandwich of three pieces. It they aren't a sandwich then it
wouldn't likely matter. After all, the rears do something like 30% of
braking. Right? At about $45, the cost is not so bad, but they are a pain to
replace if the calipers must be removed. Repeating my question. Must they, 
or is there enough space when the pads are removed? I'll bet that the 
calipers must be removed but I am hoping not.
It just dawned on me that you may be wondering why I don't know the
answer from experience. The car is on jack stands while I await the return
of lug nuts that are being chrome plated. If I NEED to replace the other disk,
then I'd just as soon do it now to take my mind off not being able to drive 
the car. Don't tell me that I was sold the wrong disk.
Thanks in advance.
Kyle Chatman 
83 XJ6

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