Bob,
Both of my rotors have the groves you are talking about. If you turn the
steering to the lock, under some conditions, the lower a-arm will rub through
the holes in the dust shield. Although I can't duplicate the rubbing, wear on
one of the castle nuts indicates the cause. When I bought the car, the wear was
already there and the rubber bushings were very dead. If your bushings are good
and the steering stop is in place, I don't know what to tell you about
preventing it from getting worse. Hopefully someone else on the list can help
there.
In the near future, I will be replacing my rotors and bearings. I will inspect
the inside of the rotors on a regular basis and verify that my problem is gone.
That said, I have about 20,000 miles with the rotors this way. Every once in a
while, I start getting a rotational noise that disappears with light brake
pressure. This can be cured by switching the inner and outer brake pads. The
other issue involves the pads pushing the brake pistons further into the caliper
and the grove and associated ridge in the pad add slop to the system. This
requires slightly more pedal travel to bring the pads back in contact with the
rotor.
Your choice as to your action. I recommend that you carefully inspect the
suspension and steering to verify that you no longer have the rubbing. Rotors
are also still reasonably priced, so I'd plan on replacing them as well at some
point in the reasonable future.
Brian Kemp
72 TR6
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