Brakes chirp when decelerating - Mazda3 Forums : The #1 Mazda 3 Forum
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post #1 of 11 (permalink) Old 04-15-2016, 05:45 PM Thread Starter
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Brakes chirp when decelerating

I have a 2006 S GT 5 speed Hatch, and I just changed the rotors and NOT the brake pads (they didn't need it) and now when I decelerate from certain speeds it seems that my brakes chirp momentarily and then are quiet.

I am wondering if it is just a dirty rotors thing, or do I need to grease the backs of the pads even though I didn't remove them?

If I do need to grease the pads, can I do that without taking off the tires, lol?

oh, and I DID follow the rotor break-in procedure after installing them.

Thanks for your help!!

Last edited by Zulan; 04-15-2016 at 05:47 PM.
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post #2 of 11 (permalink) Old 04-15-2016, 07:59 PM
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I would go through the procedures even if you're not replacing the pads. Old shit is old shit, and the dust and grime needs to be cleaned out and things need to be regreased.

Sent from the wrong side of the tracks.
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post #3 of 11 (permalink) Old 04-17-2016, 05:48 PM Thread Starter
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is there any way I could perhaps spray some cleaner on the area and grease the backs of the pads without having to take off the wheels again?
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post #4 of 11 (permalink) Old 04-17-2016, 06:06 PM
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You need to scuff the glazing off the friction surface pads before putting them to a new rotor surface. LOL, the grease needs to be between the pad and the caliper as well as the grove the pad sits in so there is no way to properly grease them without removing the pads from the car.
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post #5 of 11 (permalink) Old 04-18-2016, 11:50 AM
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Quote:
Originally Posted by Zulan View Post
I just changed the rotors and NOT the brake pads (they didn't need it)
This doesn't sound right

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post #6 of 11 (permalink) Old 04-18-2016, 03:21 PM
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Did you at least sand the surface of the old pads before putting them back on? If not you should at least do that and go through the bedding process.
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post #7 of 11 (permalink) Old 05-10-2016, 02:36 PM Thread Starter
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In response to Slavuta:

I changed the rotors because they were causing a slight vibration when braking, the new rotors fixed that issue. It was cheap enough to just replace them vs getting them turned etc.

Last edited by Zulan; 05-10-2016 at 02:41 PM.
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post #8 of 11 (permalink) Old 05-10-2016, 02:39 PM Thread Starter
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I didn't even know that I should do that when putting used pads to a new rotor... literally never had that be an issue in the past when doing this exact same thing on other cars (primarily Hondas). Since it has been a month should I still bother with it?

I DID order some brake pads at the same time I ordered the rotors and I have them just sitting in my apartment (like I said, I didnt put them on because the others had tons of life left still) should I slap those on or can I remove the squeal by simply sanding the pads?

What grit should I use to sand the pads if that is still my best route at this point?

Sorry for the late responses and stuff, I had some mean finals I had to study for! haha
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post #9 of 11 (permalink) Old 05-10-2016, 07:06 PM
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80-100 grit. Lay the sand paper rough side up on a flat surface and rub the pads back and forth on it. Also clean the center grove in the pads out if the pads have one..
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post #10 of 11 (permalink) Old 05-11-2016, 12:37 PM Thread Starter
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80-100 grit. Lay the sand paper rough side up on a flat surface and rub the pads back and forth on it. Also clean the center grove in the pads out if the pads have one..
Thanks for that! On a more technical side, just because I am curious, why do the pads chirp when being used with new rotors even though the pads have already been broken in and used with the previous rotors?
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