[Chevelle-list] 'slightly' off topic- disc brake question.

[Leo John Costigan]

First off, that gear on the back of the rotors is for the anti lock brakes. 
There is a sensor mounted of the spindle that has a set clearance between 
the sensor and the rotor. You may have this sensor too close to the rotor 
and that is the clicking sound.  You could destroy the sensor and not have 
anti lock function is a panic situation when the brakes lock up.  On the 
dash there is a warning light for anti lock brakes.  It should come on when 
ignition switch if turned to the run position and then go out.



If your vehicle does not have anti lock brakes when you got the replacement 
rotors you got the ones for anti lock and there is interference because of 
the 'gear' on the rear of the rotor and after some driving the gear brakes 
off or wears until the is clearance.



The gear on the rear of the rotor is actually part of the wheel speed sensor 
system that controls when the brake system will go into anti lock.



Hope this is of some help,  Leo
----- Original Message ----- 
From: "J. Brady" <jmbiii at yahoo.com>
To: "Chevelle Group" <chevelle-list at chevelles.net>
Sent: Saturday, September 23, 2006 5:23 PM
Subject: [Chevelle-list] 'slightly' off topic- disc brake question.


>I have a disc brake question which I'm hoping you guys
> can help me with..  Only thing is, the brakes are on
> my GMC Sonoma.
>
> Today I did new rotors, wheel bearings (in and out),
> seals, and pads on my truck (also did badly needed
> front shocks).  Thought since colder weather was on
> the way, now was the time..
>
> This is the 2nd time I've done this in the time I've
> had the truck (since 2000), and it's the 2nd time I've
> had this issue.  With all of the new parts in place, I
> went for a test drive.  Overall I can feel
> improvement, but from 0-10 and at deceleration, I can
> feel what I want to describe as a "ticking" or
> "clicking" feeling in the steering wheel.  Again it's
> only from 0-10 and at the very end.  The rotors are
> brand new, and I know they're not warped b/c it's not
> that sensation I'm feeling (I know that one).  I have
> noticed tho that on the back of the rotor, where the
> inner bearing is seated, there is what I want to call
> a 'gear' with teeth that goes all the way around.  I'm
> wondering if the ticking I'm feeling in the steering
> wheel, is because I have the discs too tight and that
> gear is rubbing somewhere?  I was able to spin the
> discs after assembly before putting the wheel on by
> hand, and they do spin but with some drag (which is
> how I thought they were supposed to be).
>
> Other point worth mentioning, I did pack all the new
> bearings with fresh grease, and filled the grease
> caps, so I don't think it's the bearings.
>
> Any help would be greatly appreciated, b/c it pissed
> me off to feel this after spending all day working on
> this truck.
>
> Regards,
>
> Jim
> '66 Malibu
> '98 Sonoma a step away from trade-in
>
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