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Be careful of those coated rotors! #4976058 01/11/19 01:12 PM
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dan_erickson Offline OP
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I did a quick simple brake job on my Accord during the week and bought new rotors from Autozone. I bought the 3 year warranty rotors that are fully coated with a black paint even on the rotor to pad surface.
Obviously the idea is that the pad will wear off the paint where it makes contact and the edges will be left with black paint and prevent it from rust. Long story short the paint got embedded into the brake pads and was causing the pad to skip across the rotor while braking. The knocking noise was awful sounding.
I took the pads off the car and sanded them with some 80 grit paper to remove the embedded paint and all is good now

Last edited by dan_erickson; 01/11/19 01:37 PM.

15 Accord Coupe EX-L V6 Navi
Castrol Magnatec 0w20

Re: Be careful of those coated rotors! [Re: dan_erickson] #4976070 01/11/19 01:24 PM
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Not exactly a nice experience after all that work!

I would suggest you contact Autozone to give them feedback - if they don't hear your comments they will assume all is fine.


2017.5 Nissan Rogue SV FWD
2013 Nissan Maxima SV
2009 Ford Flex SEL FWD
1984 Yamaha XJ750RL
Re: Be careful of those coated rotors! [Re: dan_erickson] #4976073 01/11/19 01:27 PM
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demarpaint Offline
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I didn't think coating the braking surface with paint is a good idea. It seems to me a cost cutting compromise to finishing off coated rotors, they save a few pennies not masking off the braking surface prior to painting them.


God Bless Our Troops

Re: Be careful of those coated rotors! [Re: dan_erickson] #4976081 01/11/19 01:33 PM
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Definitely give feedback to Autozone. The manufacturer needs to know this problem.

Re: Be careful of those coated rotors! [Re: dan_erickson] #4976098 01/11/19 01:46 PM
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anndel Offline
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I have EBC rotors and they came with a black paint coating. After the brake job, I drove around the block to test the system and all the paint came off. I took the caliper off again to see and none of the pads were coated/clogged with the paint.


1993 Toyota 4x4 p/u, 2.4L 22RE 4 cyl - M1 EP 10W-30, Fram UG Filter
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Re: Be careful of those coated rotors! [Re: dan_erickson] #4976115 01/11/19 02:09 PM
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Cujet Offline
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Wow, removing that paint is adding to your workload. Ugh.


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Re: Be careful of those coated rotors! [Re: dan_erickson] #4976131 01/11/19 02:20 PM
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Don't know what type of coating AZ rotors use but I've never had any issues with NAPA's fully coated rotors.


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Re: Be careful of those coated rotors! [Re: dan_erickson] #4976140 01/11/19 02:27 PM
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nthach Offline
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It seems like Bosch/ATE/Zimmermann, BPI(Napa/Raybestos) and EBC use a different coating like Geomet or a proprietary Al/Zn coating or an electrophoretic coating that won't interfere with the pads. Whoever supplied AutoZone probably used standard paint or a cheaper coating.

Re: Be careful of those coated rotors! [Re: dan_erickson] #4976233 01/11/19 03:45 PM
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FlyNavyP3 Offline
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Most of the coated rotors I've ever used were Zinc/Aluminum coated and had no issues, the ones that were painted weren't painted on the pad/rotor interface.


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P-3C and P-8A Maritime Weapons and Tactics Instructor, Instructor Tactical Coordinator and Mission Commander
Re: Be careful of those coated rotors! [Re: dan_erickson] #4976252 01/11/19 04:09 PM
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Pop the pads off, lightly sand them, reinstall, then to some hard stops.

I always use coated rotors and the only time I've had an issue is if I don't properly burnish the pads. I do back to back hard, but not locking the wheels up 50-10mph stops until I get brake fade, then drive the thing for 4-5 miles to let everything cool, avoiding stops longer than a few seconds


2005 Tahoe - 140k
2003 Forester(the swagger wagon) - Rehomed
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Re: Be careful of those coated rotors! [Re: SnowDrifter] #4976395 01/11/19 07:15 PM
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cpayne5 Offline
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Originally Posted by SnowDrifter
Pop the pads off, lightly sand them, reinstall, then to some hard stops.

I always use coated rotors and the only time I've had an issue is if I don't properly burnish the pads. I do back to back hard, but not locking the wheels up 50-10mph stops until I get brake fade, then drive the thing for 4-5 miles to let everything cool, avoiding stops longer than a few seconds


Yep, this is how to do it. Take your kids with you, they love it. At least mine do. smile

Re: Be careful of those coated rotors! [Re: dan_erickson] #4976486 01/11/19 08:51 PM
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HangFire Offline
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Originally Posted by dan_erickson
I did a quick simple brake job on my Accord during the week and bought new rotors from Autozone. I bought the 3 year warranty rotors that are fully coated with a black paint even on the rotor to pad surface.

I am guessing these would be the Duralast Gold? https://www.autozone.com/brakes-and...ast-gold-brake-rotor/818588_195255_2708#
That would be "Z-Clad"
https://www.autozone.com/landing/page.jsp?name=duralast-gold-rotors
https://youtu.be/9s_elN7lR84?t=76

According to the video and the text, it's just supposed to wear off.
Originally Posted by dan_erickson
The knocking noise was awful sounding.

I'm trying to figure out how a coating on a pad makes a "knocking noise".


Various musings: http://hangfire.net
Re: Be careful of those coated rotors! [Re: dan_erickson] #4976516 01/11/19 09:24 PM
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vavavroom Offline
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A painted coating sounds like a really bad idea for a brake component that can reach over 400°F while also undergoing constant heat cycling. Look for plated coatings.

Re: Be careful of those coated rotors! [Re: dan_erickson] #4976543 01/11/19 10:03 PM
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edyvw Offline
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Originally Posted by dan_erickson
I did a quick simple brake job on my Accord during the week and bought new rotors from Autozone. I bought the 3 year warranty rotors that are fully coated with a black paint even on the rotor to pad surface.
Obviously the idea is that the pad will wear off the paint where it makes contact and the edges will be left with black paint and prevent it from rust. Long story short the paint got embedded into the brake pads and was causing the pad to skip across the rotor while braking. The knocking noise was awful sounding.
I took the pads off the car and sanded them with some 80 grit paper to remove the embedded paint and all is good now

Just put these, coating was gone after three light braking.
[Linked Image]


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Re: Be careful of those coated rotors! [Re: HangFire] #4976583 01/11/19 11:01 PM
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dan_erickson Offline OP
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Originally Posted by HangFire
Originally Posted by dan_erickson
I did a quick simple brake job on my Accord during the week and bought new rotors from Autozone. I bought the 3 year warranty rotors that are fully coated with a black paint even on the rotor to pad surface.

I am guessing these would be the Duralast Gold? https://www.autozone.com/brakes-and...ast-gold-brake-rotor/818588_195255_2708#
That would be "Z-Clad"
https://www.autozone.com/landing/page.jsp?name=duralast-gold-rotors
https://youtu.be/9s_elN7lR84?t=76

According to the video and the text, it's just supposed to wear off.
Originally Posted by dan_erickson
The knocking noise was awful sounding.

I'm trying to figure out how a coating on a pad makes a "knocking noise".

Originally Posted by HangFire
Originally Posted by dan_erickson
I did a quick simple brake job on my Accord during the week and bought new rotors from Autozone. I bought the 3 year warranty rotors that are fully coated with a black paint even on the rotor to pad surface.

I am guessing these would be the Duralast Gold? https://www.autozone.com/brakes-and...ast-gold-brake-rotor/818588_195255_2708#
That would be "Z-Clad"
https://www.autozone.com/landing/page.jsp?name=duralast-gold-rotors
https://youtu.be/9s_elN7lR84?t=76

According to the video and the text, it's just supposed to wear off.
Originally Posted by dan_erickson
The knocking noise was awful sounding.

I'm trying to figure out how a coating on a pad makes a "knocking noise".

Originally Posted by HangFire
Originally Posted by dan_erickson
I did a quick simple brake job on my Accord during the week and bought new rotors from Autozone. I bought the 3 year warranty rotors that are fully coated with a black paint even on the rotor to pad surface.

I am guessing these would be the Duralast Gold? https://www.autozone.com/brakes-and...ast-gold-brake-rotor/818588_195255_2708#
That would be "Z-Clad"
https://www.autozone.com/landing/page.jsp?name=duralast-gold-rotors
https://youtu.be/9s_elN7lR84?t=76

According to the video and the text, it's just supposed to wear off.
Originally Posted by dan_erickson
The knocking noise was awful sounding.

I'm trying to figure out how a coating on a pad makes a "knocking noise".


The paint was heated and embedded into the pads. The next time I drove the car the pads were grabbing and then skipping across the rotor surface. It’s the best way I can explain it. When I took the pad off to clean them the pad surface looked like a mirror.


15 Accord Coupe EX-L V6 Navi
Castrol Magnatec 0w20

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