2001 Jeep Cherokee Front Brake Rotors

In article >,
jim <"sjedgingN0Sp"@m@mwt,net> wrote:

> hls wrote:
> >
> > "aarcuda69062" > wrote in message
> > ...
> > > In article >,
> > > jim <"sjedgingN0Sp"@m@mwt,net> wrote:
> >
> > >> I thought the theory behind this idea was going to be that metallic
> > >> brake pads are electrically conductive while ceramic are not (don't know
> > >> if that is even really true, but it sounds good). That would mean there
> > >> was a closed ground loop that the hub to rotor interface is part of and
> > >> that leads to the corrosion.
> > >
> > > Actually, it doesn't even sound good.
> >
> > You're right, Aarcuda...it doesn't sound good at all.
>
> So obviously you don't have the slightest clue whether or not metallic
> pads are more electrically conductive than ceramic ones.
>
> -jim

Are the seats cloth, vinyl or leather?

aarcuda69062 wrote:

>
> Are the seats cloth, vinyl or leather?

I wouldn't know. This is your fantasy not mine. As far as i remember rotors
rusted just the same even when the brake material was mostly asbestos. I suppose
it is iron dust from the engine rings that causes exhaust pipes to rust to the
point that they won't come apart also?

-jim

"jim" <"sjedgingN0Sp"@m@mwt,net> wrote in message
> So obviously you don't have the slightest clue whether or not metallic
> pads are more electrically conductive than ceramic ones.
>
> -jim

Actually I dont know for sure, and dont really thing it is germane to the
discussion. I have not been able to find that the pad manufacturers
specify conductivity as a QC parameter.

I did manage to find one reference to metallic pads as being absorbent
to water, and therefore giving better wet weather performance than organic
pads which do not absorb water. (I find that a little unusual, maybe).

If they absorb and hold water, then this may be the answer you are looking
for. Not ground loops and galvanic corrosion.

hls wrote:

> If they absorb and hold water, then this may be the answer you are looking
> for. Not ground loops and galvanic corrosion.

Thanks, I wasn't looking for an answer. It was a hypothetical cause
for a non existent effect.

-jim

"jim" <"sjedgingN0Sp"@m@mwt,net> wrote in message
...
>
>
> hls wrote:
>
>> If they absorb and hold water, then this may be the answer you are
>> looking
>> for. Not ground loops and galvanic corrosion.
>
> Thanks, I wasn't looking for an answer. It was a hypothetical cause
> for a non existent effect.
>
> -jim

Yeah, but from our feedback, you could see that neither of us liked your
hypothetical corrosion conclusion.

"jim" wrote:

..... As far as i remember rotors rusted just the same even
when the brake material was mostly asbestos. I suppose
it is iron dust from the engine rings that causes exhaust
pipes to rust to the point that they won't come apart also?
__________________________________________________ _______________

It has nothing to do with the brake pad material. It's the heat.
Heat accelerates chemical reactions such as corrosion, and the
high heat in exhaust pipes and brake rotors rusts them fast.

Rodan.

"Rodan" > wrote in message
...
> "jim" wrote:
>
> ..... As far as i remember rotors rusted just the same even
> when the brake material was mostly asbestos. I suppose
> it is iron dust from the engine rings that causes exhaust
> pipes to rust to the point that they won't come apart also?
> __________________________________________________ _______________
>
> It has nothing to do with the brake pad material. It's the heat.
> Heat accelerates chemical reactions such as corrosion, and the
> high heat in exhaust pipes and brake rotors rusts them fast.
>
> Rodan.


Heat, salt, and water. Things dont corrode very traditionally if there
is no water present. Almost all chemical reactions increase as the
temperature increases. And dissolved salts increase the conductivity
of the aqueous corrosion cell, increasing the rate of corrosion...usually.

In article >,
"Rodan" > wrote:

> "jim" wrote:
>
> ..... As far as i remember rotors rusted just the same even
> when the brake material was mostly asbestos. I suppose
> it is iron dust from the engine rings that causes exhaust
> pipes to rust to the point that they won't come apart also?
> __________________________________________________ _______________
>
> It has nothing to do with the brake pad material. It's the heat.
> Heat accelerates chemical reactions such as corrosion, and the
> high heat in exhaust pipes and brake rotors rusts them fast.
>
> Rodan.
>

Thoroughly explaining why vehicles used for short trips experience
faster exhaust system failure (rust out) versus ones that are driven
longer distances.

Not.

In article >,
jim > wrote:

> aarcuda69062 wrote:
>
> >
> > Are the seats cloth, vinyl or leather?
>
> I wouldn't know. This is your fantasy not mine.

Actually, it is _your_ fantasy.

> As far as i remember rotors

"As far as you remember?" So, it's what you "remember" versus what I
see every day of the week?

> rusted just the same even when the brake material was mostly asbestos. I
> suppose
> it is iron dust from the engine rings that causes exhaust pipes to rust to
> the
> point that they won't come apart also?

Why would there be iron dust from the "engine rings" (whatever those
are) to begin with?

aarcuda69062 wrote:
>
> In article >,
> jim > wrote:
>
> > aarcuda69062 wrote:
> >
> > >
> > > Are the seats cloth, vinyl or leather?
> >
> > I wouldn't know. This is your fantasy not mine.
>
> Actually, it is _your_ fantasy.
>
> > As far as i remember rotors
>
> "As far as you remember?" So, it's what you "remember" versus what I
> see every day of the week?

Yup I only remember asbestos pads. It has been almost 30 years since they quit
selling them around here.

>
> > rusted just the same even when the brake material was mostly asbestos. I
> > suppose
> > it is iron dust from the engine rings that causes exhaust pipes to rust to
> > the
> > point that they won't come apart also?
>
> Why would there be iron dust from the "engine rings" (whatever those
> are) to begin with?

Rings, pistons, block - I suppose you never heard of any of those? Rings are
usually made of iron, and some of that iron ends up in the exhaust. Using that
to explain the rust in the exhaust system makes about as much sense as
explaining the rust on rotors coming from the iron in the pads.

-jim