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#3465791 - 08/26/14 08:41 PM De-glazed my rotors.
eljefino Offline


Registered: 06/15/03
Posts: 29723
Loc: ME
Wife's HHR has a typical newer (shoddy) GM steering column that rattles for no sane reason. Juddering front brakes telegraphed through the steering and was driving her nuts. I pulled the rotors. Roughly ground the outer rust ridge/ lip down with a grinding wheel, so it wasn't "sticking up" and going to catch on stuff in my next step.

Then I applied a wire cup brush in a 4" angle grinder. Went at it several minutes a side. Let the natural rotation of the grinder move things around. Then I rotated the rotor 90 degrees as my technique may otherwise lead to "high spots".

I did notice lines, that could be considered pad outlines, that somewhat, but not fully, were "erased". The first few seconds of "buffing" caused an immediate change/increase in shine, but I kept at it, not feeling satisfied.

Put the car back together, 75% better, I'd say. And the price is right.

The internet-speak is onto something, "warped rotors" may not always be.

Coincidentally, I never felt this in the brake pedal on this car. It was always the steering.

Pads and rotors were new a year and a half ago.

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#3465800 - 08/26/14 08:49 PM Re: De-glazed my rotors. [Re: eljefino]
mrsilv04 Offline


Registered: 12/08/06
Posts: 7808
Loc: Illinois
Were these 'white box' rotors, or something better?
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#3465802 - 08/26/14 08:50 PM Re: De-glazed my rotors. [Re: eljefino]
spasm3 Offline


Registered: 05/30/10
Posts: 6536
Loc: out there
A lot of "warped rotors" really are pad deposits.
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#3465856 - 08/26/14 09:49 PM Re: De-glazed my rotors. [Re: spasm3]
Chris142 Offline


Registered: 06/05/03
Posts: 14256
Loc: apple valley, ca
Originally Posted By: spasm3
A lot of "warped rotors" really are pad deposits.
I dont see that here. I can remember seeing i set of rotors with pad deposits in my life. We must drive like grannies around here.
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#3465876 - 08/26/14 10:18 PM Re: De-glazed my rotors. [Re: eljefino]
Colt45ws Offline


Registered: 08/15/06
Posts: 8878
Loc: Central Washington
Yeah. I replaced 20-some thousand mile factory rotors and pads in my Mom's Fusion for the same reason. I tried sanding the rotors, but didnt get anywhere with that; though I only recently got a grinder. I did it by hand.

It was the same way; all in the steering, not in the pedal. It got worse the hotter the brakes got.


Edited by Colt45ws (08/26/14 10:19 PM)
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#3465884 - 08/26/14 10:25 PM Re: De-glazed my rotors. [Re: spasm3]
daves87rs Offline


Registered: 02/23/09
Posts: 15874
Loc: Michigan
Originally Posted By: spasm3
A lot of "warped rotors" really are pad deposits.


True..neighbor had that exact problem....
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#3465901 - 08/26/14 11:04 PM Re: De-glazed my rotors. [Re: eljefino]
redhat Offline


Registered: 12/07/12
Posts: 1366
Loc: Western New York
Its weird how some cars love to chew through rotors and present you with steering judder or unwanted pedal feel.

I have had Centric rotors and Akebono ProACT ceramic pads on the Accord for 30K+. I'm not super easy and sometimes do brake hard. I always make sure to let the rotors cool/don't keep the brakes on after a hot/fast stop. Have in-between 2/3 and 3/4 of the pads left and braking is as smooth as the day they were new.
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#3465919 - 08/26/14 11:26 PM Re: De-glazed my rotors. [Re: eljefino]
Rylan Offline


Registered: 09/10/13
Posts: 133
Loc: NV
I think I've mentioned these before: for $40, they're one of the best gadgets a DIYer can buy.

Brush Research Flex-Hone for brake rotors
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#3465943 - 08/27/14 12:18 AM Re: De-glazed my rotors. [Re: eljefino]
Andy636 Offline


Registered: 12/30/10
Posts: 707
Loc: Romania
I'm curious if the same result could be achieved by applying some acid with a brush.

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#3466004 - 08/27/14 04:11 AM Re: De-glazed my rotors. [Re: mrsilv04]
eljefino Offline


Registered: 06/15/03
Posts: 29723
Loc: ME
Originally Posted By: mrsilv04
Were these 'white box' rotors, or something better?


IDK, the PO put them on right before sale. He was into lifting jeeps and could turn a wrench, but I could imagine using the cheapest stuff around on something he was about to unload.

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#3466216 - 08/27/14 10:47 AM Re: De-glazed my rotors. [Re: eljefino]
Vikas Offline


Registered: 07/22/05
Posts: 10633
Loc: NorthEast
How come you did not jack up the vehicle, start the engine, put it in gear and did a redneck on the car de-glazing of the rotors? Seriously, I am little confused as to how you could use grinder to get the rotor flat?


Edited by Vikas (08/27/14 10:47 AM)

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#3466398 - 08/27/14 01:51 PM Re: De-glazed my rotors. [Re: eljefino]
GMBoy Offline


Registered: 11/22/04
Posts: 7087
Loc: Texas
I wonder if a good break cleaner soak occasionally would keep rotors "clean" of pad deposits and extend life??

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#3466426 - 08/27/14 02:33 PM Re: De-glazed my rotors. [Re: GMBoy]
SteveSRT8 Offline


Registered: 10/10/08
Posts: 17765
Loc: Sunny Florida
Originally Posted By: GMBoy
I wonder if a good break cleaner soak occasionally would keep rotors "clean" of pad deposits and extend life??


typically not, as they are literally welded on...
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#3466660 - 08/27/14 06:09 PM Re: De-glazed my rotors. [Re: Vikas]
eljefino Offline


Registered: 06/15/03
Posts: 29723
Loc: ME
Originally Posted By: Vikas
How come you did not jack up the vehicle, start the engine, put it in gear and did a redneck on the car de-glazing of the rotors? Seriously, I am little confused as to how you could use grinder to get the rotor flat?


I did think of that. smile

I was concerned that due to the shape of my arm/ musculature I was bearing down more on 12 and 6 oclock than 3 and 9, or vice versa, so I twisted the rotor to make up for this perception of shortcoming.

I used a real grinding wheel/stone to cut the 3mm thick ridge on the outer perimeter down. Otherwise it would have plucked wire out of the brush.

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#3466737 - 08/27/14 07:27 PM Re: De-glazed my rotors. [Re: eljefino]
KrisZ Offline


Registered: 12/23/06
Posts: 5916
Loc: Toronto, Canada
I did something similar not too long ago on my wife's mazda 3, except a used 80 grit sand paper and a piece of 2x4 as a flat surface. However, the rotors and pads were glazed, but smooth operating otherwise.
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#3466763 - 08/27/14 07:57 PM Re: De-glazed my rotors. [Re: eljefino]
buck91 Offline


Registered: 04/17/12
Posts: 1813
Loc: West Michigan
I am getting some high speed (>60mph) steering wheel shudder when I hit the brakes. Last time it went away with a rotor turning, but I really don't want to burn through multiple rotors per padset on the truck...
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#3467502 - 08/28/14 02:07 PM Re: De-glazed my rotors. [Re: Rylan]
Oldmoparguy1 Offline


Registered: 01/21/05
Posts: 5206
Loc: Charlotte, NC
Originally Posted By: Rylan
I think I've mentioned these before: for $40, they're one of the best gadgets a DIYer can buy.

Brush Research Flex-Hone for brake rotors

Amazon has several offerings for these. I'm thinking that this may be what I need to cure the brake shudder on my 13 GC. What grit do you recommend, they come in course, medium and fine.

Wayne
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#3467512 - 08/28/14 02:17 PM Re: De-glazed my rotors. [Re: eljefino]
The_Nuke Offline


Registered: 07/21/13
Posts: 64
Loc: D/FW, Texas
PDF about Brake Judder: https://drive.google.com/file/d/0B3ISyrRQO5VlNlRqOE9HTVlfTkk/edit?usp=sharing

I don't remember where I found that doc, heck it might have even been on here somewhere, but it presents a good pretty good point about this particular subject, so I figured I should put it out for consumption.

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#3467601 - 08/28/14 03:42 PM Re: De-glazed my rotors. [Re: eljefino]
Miller88 Offline


Registered: 04/09/08
Posts: 11337
Loc: Onondaga County
I used 60 grit sand paper and a block on the Cherokee's rotors and pads recently.

After an off roading trip, I had no front brakes. They just didn't do anything.

Pulled it apart and everything was working.

Turns out there was a super, super, super fine sand that got in and glazed over the rotors and pads. Little bit of sanding and it's fine again.
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#3468273 - 08/29/14 10:42 AM Re: De-glazed my rotors. [Re: eljefino]
hsd Offline


Registered: 09/05/09
Posts: 249
Loc: NE
I have seen that washing the wheels (& car) leaves a noticeable rust film on the rotors that goes away after the next drive. I'm thinking that layer of rust should remove any pad deposits and related brake judder, but I havent fully tested this theory. Anyone with brake judder tried this?

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#3468276 - 08/29/14 10:46 AM Re: De-glazed my rotors. [Re: eljefino]
Quest Offline


Registered: 12/19/04
Posts: 7355
Loc: beaver land EH?
Regardless of the circumstances, when in doubt: it's never a bad idea to get a dial indicator and check for rotor runout before you decide on your next move (to replace rotors, deglaze it, or whatever):

http://www.amazon.com/s/ref=nb_sb_noss?url=search-alias%3Daps&field-keywords=dial%20indicator

Once you determined that the runout is within or below specs, then proceed to deglaze and slap on new pad materials, etc.

No use deglazing an otherwise warped rotor to begin with (only machining can bring them true again).

Q.

Sometimes, a significant runout (out of true) hub can attribute to rotor out of true and the perceivable results will be similar to rotor warping, even with fresh new blanks. The only way to overcome that is either to replace the hub or shim it (as what Trav has suggested before).

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#3468747 - 08/29/14 07:29 PM Re: De-glazed my rotors. [Re: eljefino]
andyd Offline


Registered: 09/25/04
Posts: 5031
Loc: Marshfield , MA
Hey, all you have to do to check for a warped rotor is to spin the wheels when they are up in the air. Check out the rotor as it goes through the pads. You will see the wobble if there is one. grin2
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