Re: [DML] front brake rotor replacement

["Walter" <Whalt@xxxx>]

Some of my brake pulsation started after making those hard stops. That was
shortly after I got the car, and I wanted to see how it handled. Since then
I have gotten wiser and the pulsation has gotten progressively worse.
Sometimes it is mild, and other times it is pretty bad. I suppose that both
front rotors are warped, and when both bad spots hit 180 degrees apart then
it is real bad. If I let go of the wheel and stop at a traffic light, the
steering wheel will wobble with an amplitude (peak to peak) of 10 to 12mm.
That's measuring at the outer perimeter of the wheel. (You can tell I have
an engineering background :)

After I had my front wheels re-aligned, the pulsation was barely noticeable.
But that was done right after I installed lowered front springs. As they
broke in over the next few hundred miles, my alignment is no longer as
toe-in as they should be. The wheels are more pointing straight ahead. Now
the pulsation is as bad as ever again.

I am aware that over-tightening the lug nuts on many cars can warp the
rotors, but I don't see how this is possible on the front wheels of the
DeLorean due to how the lugs are isolated from the rotor. But I keep an
open mind and a torque wrench handy when putting my wheels on.

If my brake problems are not the result of over-heating from hard stops,
then I would say that mine were from a bad batch -- particularly the rear
rotors. One of them has a chip on the perimeter and a gouge that covers
2-3mm around 1/3rd of the outer perimeter. This gouge came from never
having any metal there to begin with. Whoever originally cut this one
wasn't paying attention. And then whoever put it on the car wasn't paying
attention either. That rotor should have never been used.

I got all the new parts -- rotors, calipers, master cylinder, pads, etc.
It's just a matter of finding the time to do it. But I'm not complaining.
I actually LIKE working on this car. :)

Walt Tampa, FL