Bob,
The hard spots that you mention are "heat spots" that result from
overheating the drum. I don't think that they have anything to do with
mixed metals. I've seen brake shoes that come with a wide groove down
one shoe to alleviate the problem.
About 6 months ago I bought a pair of new drums for my Astro van. Due
to brake system problems I didn't know about, the rear drums were
actually doing more braking than the front discs. Within a few months
the new rear drums were heat spotted.
Mild heat spotting can often be removed during the drum turning process.
If the spots are too deep, however, too much material must be removed
and the drums are junk.
A good pair of used drums will do just fine so long as they aren't heat
spotted.
Date: Fri, 30 Apr 2004 09:57:15 -0600
From: Bob Zubkowski <bzubkow@xxxxxxx>
Subject: IML: re: brake drums
I have used now. They have to be taken to a machine shop to be brought
up to spec. The problem with the old drums are the method in which they
were manufactured. They mixed different type of metal that caused hard
spots which create grabbing when braking. I have sent them out to be
done but if I could fine new better quality drums I would put them on.
Zub
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