general min. spec on run out is .002 any more than that and you have a problem

Mark wrote:

> Matt,
>
> You may be right. I put the new magnetic dial indicator on the rotors & low
> and behold one side was out only .003, the other .006" - I measured both
> sides for runout - the side with the .006 is a thickness problem. Either
> way - I'm sure that's well within spec. I took my die grinder with a scotch
> brite roloc to the outside surfaces to rough them up a bit. Made a series
> of hard stops - under hard braking it is smooth & has powerful braking -
> easily got the abs working. Its still not quite right on the normal stop.
> I may take the wheels off and rough up the inside surfaces as well - but
> I'll first drive around a bit with some heavy braking. ( with my last set
> of rotors were really warped, a mountain road helped with the warping - the
> things were toast) I have to say that having a dial indicator is going to
> be pretty useful for these sort of problems in the future.
>
> Mark
>
> "Matt Whiting" > wrote in message
> ...
> > I've not used these type of pads, but does the break-in procedure call
> > for very light braking during break-in? The break-in procedures I've
> > read typically call for moderate to heavy braking during initial
> > break-in to avoid glazing the pads and rotors. Usually, you make a
> > series of reasonably hard stops with adequate cooling time in between to
> > avoid warping the rotors.
> >
> > It is possible to "warp" the rotors without actually warping them. The
> > theory is that with braking that is too light, you can cause the rotor
> > to have uneven friction around its circumference and this causes pulsing
> > that feels like a warped rotor, when in fact the rotor is just fine
> > dimensionally. I've read that it can sometimes be cured with a series
> > of fairly heavy stops to break the glaze.
> >
> > If you feel the braking is already so annoying that you are ready to
> > replace the rotors again, then you have nothing to lose by trying a few
> > hard stops to see if it helps.
> >
> >
> > Matt
> >