The quality of aftermarket Brembo product has diminished.  Their rotors
have gotten pretty cheap as well.  Try another brand if possible?

Jason

On Sat, May 19, 2012 at 10:47 AM, Steven Shelton <shelton4@gmail.com> wrote:

> Interesting that you mention 0.010 mm, Scott.  I mounted each drum on the
> scroll chuck of my woodworking lathe and measured the runout.
>  Unfortunately, I don't have a dial gauge so I held the depth probe on my
> calipers next to the inside of the drum.  It wouldn't measure any runout on
> one of the drums (even though it didn't scrape all the way around) but the
> other drum was 0.010 mm off.  This same drum doesn't have and
> balance weights, either.  Hmmmmm.  Of course, like the drums, my calipers
> are made in China, so who knows how accurate that measurement is.
>
> Thanks for all your suggestions.  It's back to the FLAPS for another drum.
>  I'll see how the new one measures out before I install it.
>
>
> On Sat, May 19, 2012 at 1:06 AM, Scott Daniel - Turbovans <
> scottdaniel@turbovans.com> wrote:
>
> > I'm sure it's possible that someone could get a new drum on and not get
> > it sitting really right on the flange ..
> > or fail to clean scmutz off the flange face ..
> > but 'normally' ..you make sure the two holes in the drum line up with
> > their respective bolt holes in the flange, and get the drum on there
> > correctly.
> >  And then ..you turn the drum to see if it turns smoothly ..
> > *surely* anyone installing a drum onto a flange, or anything that turns
> > ..would check that it turns smoothly ...and doesn't wobble.
> >
> > and then if it was wonky anyway ...
> > when the wheel was bolted on , that t would be wonky  too.
> > and surely ...anyone doing this work would check that the wheel turns
> > smoothly and straight.
> > ( I've seen someone remove a whole vanagon dash ..
> > and never once check the function of any of the heater control cables
> > ..which I can't imagine ( they were REAL screwed up too )  so I guess
> > people do do work and don't check things ..but man.
> >
> > really ...check *everything* ....everything.
> > if not checking each step of the way ...a body can't do consistently
> > good work.
> >
> > and yes. there can be  out-of- round new drums.
> > I use a spare rear wheel housing and stub axle with flange on it ...
> > to jig up a drum in a vice ..
> > then I turn it by hand,   with a dial gauge reading out of roundness ,
> > or roundness as the case may be.
> >
> > also ...a small test that may reveal something..
> > while driving, say at 30 mph ...pull on the parking brake pretty hard
> > and see if you feel pulsation there..
> > if you do ..it is for sure associated with one or both rear drums.
> >
> > you can also do that test on the car by putting the drums on the rear
> > wheel flange backwards ... or inside out .
> > then drive it in first gear in the air..
> > rig a pointer ..say a screw driver clamped to a jack stand ..
> > it should be pretty close to round .. a few thou off is probably normal
> ..
> > but .010" out would be pretty bad I'd say.
> >
> > for reference , a spark plug gap is .028" .  to give an idea what .010
> > is if you don't have a dial gauge.
> >
> > Do good careful work. It's all in the details.
> >
> > scott
> > turbovans
> >
> >
> > On 5/18/2012 9:14 PM, Ben T wrote:
> >
> >> Hi Steven,
> >>
> >> As Dennis Haynes just pointed out, the centerbore at flat surface of the
> >> drum can get caught on the edge of the hub. Once torqued down, the drum
> is
> >> frequently irreparable. I didn't believe it could happen to a new drum
> >> until it did at a local shop working in a Westy for a friend of mine.
> >>
> >>
> >> BenT Drum
> >> sent from my electronic leash
> >>
> >> On May 18, 2012, at 11:20 AM, Steven Shelton<shelton4@GMAIL.COM>
>  wrote:
> >>
> >>  I just installed new Brembo drums and SBS shoes in my 1985 Camper.  Now
> >>> the
> >>> brake pedal pulsates when I apply the brakes.  The only thing I can
> think
> >>> of that would cause this is out of round drums.  Can anyone think
> >>> of anything else that would cause this?
> >>>
> >>
>