Classic Mustangs List Archive

This read-only message was archived from a public mail list.
Mail From: (email redacted) (jsanti2)

I recently took my rear brake drums into a shop to see if they could get taken
down. They were in pretty bad shape, and there were sections of the outer
lip/rim that were broken off (not the part that forms the surface for the pad
to contact, just the edge). I asked the tech there if that was a problem, and
he said no.

Now here's my question -if they add those little weights onto tire rims to
balance them out, how could chunks of metal missing from the outer rim of the
brake drum not matter when they too are spinning around? Won't that unbalance
the rotating assembly all the same? Granted, they are not as far out as the
wheel rim (and thus not creating as much force), but in terms of balancing (of
which I know very little!), a little bit seems to matter a lot.

So what do folks think, is this technician wrong or am I missing something? It
turns out that the drums are too far gone, so I'm getting new ones. But I've
got this in my head now and thought it would be nice to hear what people have
to say. Thanks much, -john

This read-only message was archived from a public mail list.
Mail From: (email redacted) (Wal Marshall)

John,

> I recently took my rear brake drums into a shop to see if they could get
taken
> down. They were in pretty bad shape, and there were sections of the outer
> lip/rim that were broken off (not the part that forms the surface for the
pad
> to contact, just the edge). I asked the tech there if that was a problem,
and
> he said no.

I would say you are right and its a problem. The drums are balanced to quite
fine tolerances and chunks missing will throw the balance out. How much its
out will depend on how much metal is missing and whether its reasonably
evenly spaced or mostly on one side.

If they were mine I would toss them and get new or good used replacements.
If you want to use them you can fit them and see if there is a rear wheel
out of balance problem at speed, and if there is get them rebalanced. At a
guess you could take them into a tyre shop mount then via the centre hole
onto a wheel balancer and see how much they are out and where. Then maybe do
a bit of grinding?

Good luck

Wal Marshall
www.nzmustang.com

This read-only message was archived from a public mail list.
Mail From: (email redacted) ((email redacted))

Toss them! I had (geeez - do I admit this here?) a Mopar, that had pulsing=
brakes when I bought it and the owner just had the brakes done. Turns-out=
they would distort when hot (from the same missing chunks you have) and=
were true when cold. I also tossed them because I didn't want to blow an=
already damaged drum on a panic stop - if that might happen. I figured I=
was playing it safe.
FWIW,
David M.
********** REPLY SEPARATOR ***********
On 1/12/03 at 11:12 PM jsanti2 wrote:

>I recently took my rear brake drums into a shop to see if they could get
>taken
>down. They were in pretty bad shape, and there were sections of the outer
>lip/rim that were broken off (not the part that forms the surface for the
>pad
>to contact, just the edge). I asked the tech there if that was a problem,
>and
>he said no.
>
>Now here's my question -if they add those little weights onto tire rims to=

>balance them out, how could chunks of metal missing from the outer rim of
>the
>brake drum not matter when they too are spinning around? Won't that
>unbalance
>the rotating assembly all the same? Granted, they are not as far out as
>the
>wheel rim (and thus not creating as much force), but in terms of balancing
>(of
>which I know very little!), a little bit seems to matter a lot.
>
>So what do folks think, is this technician wrong or am I missing
>something? It
>turns out that the drums are too far gone, so I'm getting new ones. But
>I've
>got this in my head now and thought it would be nice to hear what people
>have
>to say. Thanks much, -john
>
>_______________________________________________
>Classic-mustangs mailing list
>(email redacted)
>mix.twistedpair.ca/mailman/listinfo/classic-mustangs

*************END OF SECTION**************

This read-only message was archived from a public mail list.
Mail From: (email redacted) (RonMan)

HE is getting new drums "It
>turns out that the drums are too far gone, so I'm getting new ones. But
>I've" He was just wondering if he hadn't would that be a problem.....

I think the tech was planning on changing them the whole time that's why
there was no problem.

Ron
----- Original Message -----
From: <(email redacted)>
To: <(email redacted)>
Sent: Monday, January 13, 2003 3:47 AM
Subject: Re: [CM] Drum Brake Inquiry


Toss them! I had (geeez - do I admit this here?) a Mopar, that had pulsing
brakes when I bought it and the owner just had the brakes done. Turns-out
they would distort when hot (from the same missing chunks you have) and were
true when cold. I also tossed them because I didn't want to blow an already
damaged drum on a panic stop - if that might happen. I figured I was
playing it safe.
FWIW,
David M.
********** REPLY SEPARATOR ***********
On 1/12/03 at 11:12 PM jsanti2 wrote:

>I recently took my rear brake drums into a shop to see if they could get
>taken
>down. They were in pretty bad shape, and there were sections of the outer
>lip/rim that were broken off (not the part that forms the surface for the
>pad
>to contact, just the edge). I asked the tech there if that was a problem,
>and
>he said no.
>
>Now here's my question -if they add those little weights onto tire rims to
>balance them out, how could chunks of metal missing from the outer rim of
>the
>brake drum not matter when they too are spinning around? Won't that
>unbalance
>the rotating assembly all the same? Granted, they are not as far out as
>the
>wheel rim (and thus not creating as much force), but in terms of balancing
>(of
>which I know very little!), a little bit seems to matter a lot.
>
>So what do folks think, is this technician wrong or am I missing
>something? It
>turns out that the drums are too far gone, so I'm getting new ones. But
>I've
>got this in my head now and thought it would be nice to hear what people
>have
>to say. Thanks much, -john
>
>_______________________________________________
>Classic-mustangs mailing list
>(email redacted)
>mix.twistedpair.ca/mailman/listinfo/classic-mustangs

*************END OF SECTION**************

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