Miata Mailing List: December 1992, Message #83
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   From: (none)
Subject: Re: Front disc rotors - something funny going on?
   Date: (none)

>Was out rotating the tires this weekend on my '91 Miata (15,000 miles.)
>While I had the wheels off I though I should check to see that things
>were doing OK in there.  Rear brake pads and rotors - A-OK.  Front
>brake pads appear to be OK - worn a little but still should have plenty
>of life.  However, the rotors have little grooves worn in them that I
>can feel if I run my finger over the surface, whereas the rear rotors
>feel absolutely flat and smooth.  It's nothing like what happens when
>you wear through a brake pad - I've seen that before.  Is this just
>a symptom of the front brakes doing more that 50% of the work, or is
>there something wrong with the rotor or brake pad?
>
>-Jeff


There's probably nothing wrong.  Rotors will get grooves.  The only
question is:  How deep are they?

The only problem will be when you replace the pads.  The new pads will wear
and maybe make noise until they fit the grooves in the rotor.

Sanford Meek
meek@me.mech.utah.edu