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[Shop-talk] Pulsing brakes

Subject: [Shop-talk] Pulsing brakes
From: jibjib at (Jack Brooks)
Date: Sun, 24 Jul 2011 22:38:15 -0700
References: <A6D581F79D074FB5A782E6FBD9A08DFB@EntCent>
Ok, replace the front rotors last weekend and the brakes all the way around.
The suspension was tight, with no apparent damaged or worn components.  

What I did find was a discolored portion on one disk, the one that vibrated.
There is obviously an issue with the material in one area, either heat
affected, splashed when very hot or something.  I did not do a runout check,
as I didn't notice the area initially, but it feels smooth with no visible
cracks, just a darker area about 1.25 inches in "diameter".

Whatever altered that area was likely the problem.


-----Original Message-----
From: shop-talk-bounces at
[mailto:shop-talk-bounces at] On Behalf Of jibjib at
Sent: Monday, June 20, 2011 10:08 PM
To: 'Shop Talk List'
Subject: [Shop-talk] Pulsing brakes

I have an interesting issue puzzling me.  My 2006 Chevy Malibu is about
ready for brakes, which I will be doing shortly.  The biggest issue is a
pulsing from the left front wheel.  The pulsing is very mild for all
driving, almost indiscernible.  When I am driving down hills, even when the
brakes are dead cold, the vibration has gotten moderately severe; to the
point that I'm thinking it might be more than just the rotor.  I did the tie
rod ends at 78k miles and now we are at 118K.


The shimmy has always been worse on down hills, which perplexes me.


The car will be getting new rotors and brake pads up front, where the shimmy
is.  If there is still a problem, that I do not see when I change out the
rotors and pads, I'll address it, but I was just wondering if anyone had a
plausible explanation of why the shimmy is so much worse on a downhill.  It
is not heat build up, as I've experimented with not using the brakes until
the downhill and from the first application, the shimmy is far worse.



Thanks in advance,



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