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Be careful of those coated rotors! #4976058
01/11/19 01:12 PM
01/11/19 01:12 PM
Joined: Aug 2010
Posts: 614
Crown Point, IN
dan_erickson Offline OP
dan_erickson  Offline OP

Joined: Aug 2010
Posts: 614
Crown Point, IN
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
01/11/19 01:24 PM
Joined: Oct 2014
Posts: 1,177
SW Ontario Canada
KGMtech Offline
KGMtech  Offline

Joined: Oct 2014
Posts: 1,177
SW Ontario Canada
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
01/11/19 01:27 PM
Joined: Jul 2005
Posts: 31,694
NY
demarpaint Offline
demarpaint  Offline

Joined: Jul 2005
Posts: 31,694
NY
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
01/11/19 01:33 PM
Joined: Jun 2002
Posts: 12,883
The Motor City
Kestas Offline
Global Moderator
Kestas  Offline
Global Moderator

Joined: Jun 2002
Posts: 12,883
The Motor City
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
01/11/19 01:46 PM
Joined: May 2009
Posts: 816
Hawaii, USA
anndel Offline
anndel  Offline

Joined: May 2009
Posts: 816
Hawaii, USA
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
2005 Toyota Avalon XL, 3.5L V6, Amsoil SS 5W-30, Amsoil Filter
2014 Toyota Tacoma 4.0L V6, Amsoil SS 5W-30, Yota OEM Filter
Re: Be careful of those coated rotors! [Re: dan_erickson] #4976115
01/11/19 02:09 PM
01/11/19 02:09 PM
Joined: Feb 2003
Posts: 8,078
Jupiter, Florida
Cujet Offline
Cujet  Offline

Joined: Feb 2003
Posts: 8,078
Jupiter, Florida
Wow, removing that paint is adding to your workload. Ugh.


People who count on their fingers should maintain a discreet silence.
Re: Be careful of those coated rotors! [Re: dan_erickson] #4976131
01/11/19 02:20 PM
01/11/19 02:20 PM
Joined: Apr 2016
Posts: 815
Specific Ocean
Kibitoshin Offline
Kibitoshin  Offline

Joined: Apr 2016
Posts: 815
Specific Ocean
Don't know what type of coating AZ rotors use but I've never had any issues with NAPA's fully coated rotors.


Shin Gekiretsu Shin'ou'hou
01 Toyota Tundra 2WD V8 4.7L
02 Chevy Silverado C1500 V8 5.3L
Re: Be careful of those coated rotors! [Re: dan_erickson] #4976140
01/11/19 02:27 PM
01/11/19 02:27 PM
Joined: Jan 2004
Posts: 5,007
California
nthach Offline
nthach  Offline

Joined: Jan 2004
Posts: 5,007
California
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
01/11/19 03:45 PM
Joined: Jul 2016
Posts: 1,798
Jacksonville, FL
FlyNavyP3 Offline
FlyNavyP3  Offline

Joined: Jul 2016
Posts: 1,798
Jacksonville, FL
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.


Luke
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
01/11/19 04:09 PM
Joined: Aug 2014
Posts: 651
WA
SnowDrifter Offline
SnowDrifter  Offline

Joined: Aug 2014
Posts: 651
WA
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
1999 Passat - Rehomed
Re: Be careful of those coated rotors! [Re: SnowDrifter] #4976395
01/11/19 07:15 PM
01/11/19 07:15 PM
Joined: Dec 2005
Posts: 750
Virginia
cpayne5 Offline
cpayne5  Offline

Joined: Dec 2005
Posts: 750
Virginia
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
01/11/19 08:51 PM
Joined: Aug 2013
Posts: 3,105
Central Maryland
HangFire Offline
HangFire  Offline

Joined: Aug 2013
Posts: 3,105
Central Maryland
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
01/11/19 09:24 PM
Joined: Oct 2017
Posts: 412
California
vavavroom Offline
vavavroom  Offline

Joined: Oct 2017
Posts: 412
California
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
01/11/19 10:03 PM
Joined: Mar 2012
Posts: 6,448
Colorado Springs
edyvw Offline
edyvw  Offline

Joined: Mar 2012
Posts: 6,448
Colorado Springs
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]


15' Toyota Sienna AWD (Mobil1 5W30 EP+OEM filter).
11' VW Tiguan 2.0T (Castrol 0W40+MANN filter)
Re: Be careful of those coated rotors! [Re: HangFire] #4976583
01/11/19 11:01 PM
01/11/19 11:01 PM
Joined: Aug 2010
Posts: 614
Crown Point, IN
dan_erickson Offline OP
dan_erickson  Offline OP

Joined: Aug 2010
Posts: 614
Crown Point, IN
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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