[DMCForum] rear brake rotors

["Walter Coe" <Whalt@xxxxxxx>]

Re: [DMCForum] Avi is Back! - Walt isn't

Today I replaced my rear brake rotors (again) and accidentally let the
master cylinder run dry while bleeding.  So... I have to wait until
tomorrow
to buy master cylinder bleed kit before I can get the car back on the
road.

The issue with my brakes: one of the original rear rotors was chipped, so
I
had to replace it.  I got a new pair from PJ Grady, and they sucked
royally.
They had excessive runout which was so bad that if I had them cut then
they
would have been under spec.  And these were new rotors!  Interestingly
enough, I had no problems with brake pulsation.  The runout wasn't
thickness
variation but a matter of not having the hub parallel with the rotor.  As
the rotor wobbled, it pushed the brake pads apart.  This seemed to not be
a
problem at first.  Rob told me over the phone that this wouldn't hurt the
calipers.  As the rotor turned, the wobble slapped the hand brake pads and
caused one of them to fall off.  (I'm not the first to have this problem
with PJ Grady rotors, BTW.)  So I put on new pads and adjusted the hand
brake with lots of play to give room for the rotor to wobble.  Soon
afterwards the brakes feel glazed.  I take the wheels off; and sure
enough,
there is a bluish glossy layer all over the rotor.  So I sand it off and
was
fine for a while.  This was about a year ago.

Now fast forward to the present: the glaze is back and stopping the car
requires much more pressure on the pedal.  So... I put another set of
rotors
on.  These are NOS from DMCJoe while he had a half-off sale about 2 years
ago.  One rotor has no runout that I can tell.  The other has just a speck
of runout -- not even worth mentioning.  Hopefully this will solve my
rotor
glazing problem.

And the moral of the story?  Always buy your parts from DeLorean specific
vendors and you won't have these kinds of issues.  Oh wait!  That's what I
did.  So much for that idea.  Well, I have one more beer in the fridge.
:-)

Walt


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