Recent Topics
Why, just why?
by StevieC
1 minute 10 seconds ago
I want to replace AAA - response time is terrible!
by kpatter
Today at 06:58 PM
Wright tools
by Donald
Today at 05:25 PM
UltraPure Trumpet Valve OIl
by Al
Today at 05:19 PM
TV Types & Features Explained.
by StevieC
Today at 04:57 PM
Super Knock
by bigj_16
Today at 04:52 PM
Fumoto Thanksgiving Sale 20% Off
by craigq
Today at 02:39 PM
Oreillys super start battery?
by ron350
Today at 02:28 PM
No Turkey this year
by Duffyjr
Today at 01:23 PM
Autolite 6607 C&P
by FordBroncoVWJeta
Today at 01:08 PM
Cleaned Intake Now Revs Are Limited
by cb450sc
Today at 11:50 AM
Napa Gold Cut open, W I D E pleat spacing
by 5AcresAndAFool
Today at 11:35 AM
API SN Plus Update?
by bigj_16
Today at 11:31 AM
EPC code/illumination on New VW Jetta
by thorromig
Today at 10:53 AM
New PP 5W30 DEXOS 1 Gen 2
by ChrisD46
Today at 10:48 AM
Goodyear Assurance Comfortred Touring
by reemoe2
Today at 10:35 AM
Detailed the XJ
by HoosierJeeper
Today at 10:35 AM
Walmart also has some stuff you Castrol users
by JohnnyJohnson
Today at 09:55 AM
So I rented a 2017 Charger R/T- my review
by MCompact
Today at 09:49 AM
PUP Ultra $19.98 Walmart
by knnaz392
Today at 09:47 AM
Newest Members
deckm00, Cblove91, CarGuy99, bobcat, Skier
63481 Registered Users
Who's Online
86 registered (4WD, b1amgm47, 2009Edge, alphadog, Artem, 901Memphis, 8 invisible), 1451 Guests and 15 Spiders online.
Key: Admin, Global Mod, Mod
Forum Stats
63481 Members
66 Forums
274229 Topics
4558348 Posts

Max Online: 3590 @ 01/24/17 08:07 PM
Donate to BITOG
Page 1 of 2 1 2 >
Topic Options
#3465791 - 08/26/14 08:41 PM De-glazed my rotors.
eljefino Offline


Registered: 06/15/03
Posts: 31699
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.

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


Registered: 12/08/06
Posts: 7927
Loc: Illinois
Were these 'white box' rotors, or something better?
_________________________
Ask me about my junk, knocking Jasper engine, that failed and had to be replaced at only 2,200 miles, and how poorly Jasper handled the claim.

Top
#3465802 - 08/26/14 08:50 PM Re: De-glazed my rotors. [Re: eljefino]
spasm3 Online   content


Registered: 05/30/10
Posts: 7816
Loc: North Carolina
A lot of "warped rotors" really are pad deposits.
_________________________
13 elantra 63k 5w30 QSUD
03 chevy avalanche74k synpwr 5w30
02 saturnsc1 70k 5w30 synpwr
01 saturnsc1 185k synpwr rebuilt
93 ciera 83k 10w30 synpwr

Top
#3465856 - 08/26/14 09:49 PM Re: De-glazed my rotors. [Re: spasm3]
Chris142 Offline


Registered: 06/05/03
Posts: 15823
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.
_________________________
02 Wrangler super-s 10w30
87 F250 proline 15w40
04 Tahoe super-s 5w30
Z400 Lucas 10w30
KLR250 Maxima 10w40
Can am maveric edge 5w40
57 case tractor 15w40

Top
#3465876 - 08/26/14 10:18 PM Re: De-glazed my rotors. [Re: eljefino]
Colt45ws Offline


Registered: 08/15/06
Posts: 9498
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)
_________________________
-Colton
2002 Ford Crown Vic PI 207k, Ex-Kootenai County, ID Unit #42
Down for engine swap
2003 Ford Crown Vic PI 70k
Havoline HM 5W20, Supertech ST2

Top
#3465884 - 08/26/14 10:25 PM Re: De-glazed my rotors. [Re: spasm3]
daves87rs Offline


Registered: 02/23/09
Posts: 16590
Loc: Michigan
Originally Posted By: spasm3
A lot of "warped rotors" really are pad deposits.


True..neighbor had that exact problem....
_________________________
Whatever you are, be a good one.

Top
#3465901 - 08/26/14 11:04 PM Re: De-glazed my rotors. [Re: eljefino]
redhat Offline


Registered: 12/07/12
Posts: 1634
Loc: Anywhere, USA
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.
_________________________
09 Accord Sedan 5MT - ProLine Conv. 5W-20, NG 7356, 136k
14 Civic EX Coupe - NAPA Syn. 0W-20, L14610, 42k

Top
#3465919 - 08/26/14 11:26 PM Re: De-glazed my rotors. [Re: eljefino]
Rylan Offline


Registered: 09/10/13
Posts: 145
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
_________________________
'05 Hyundai Accent GLS (1.6L) 111K+ miles, 32MPG
'09 Hyundai Elantra Touring (2.0L) 102K+ miles, 28MPG

Top
#3465943 - 08/27/14 12:18 AM Re: De-glazed my rotors. [Re: eljefino]
Andy636 Offline


Registered: 12/30/10
Posts: 746
Loc: Romania
I'm curious if the same result could be achieved by applying some acid with a brush.

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


Registered: 06/15/03
Posts: 31699
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.

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


Registered: 07/22/05
Posts: 11108
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)

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


Registered: 11/22/04
Posts: 7548
Loc: Texas
I wonder if a good break cleaner soak occasionally would keep rotors "clean" of pad deposits and extend life??

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


Registered: 10/10/08
Posts: 18598
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...
_________________________
"In a democracy, dissent is an act of faith."
J. William Fulbright
Best ET-12.79 @ 111 mph
4340 pounds, Street tires
Just like we go to Publix

Top
#3466660 - 08/27/14 06:09 PM Re: De-glazed my rotors. [Re: Vikas]
eljefino Offline


Registered: 06/15/03
Posts: 31699
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.

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


Registered: 12/23/06
Posts: 6877
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.
_________________________
2015 Dodge Grand Caravan-15k miles.
2006 Mazda 3-145k miles

Top
#3466763 - 08/27/14 07:57 PM Re: De-glazed my rotors. [Re: eljefino]
buck91 Offline


Registered: 04/17/12
Posts: 2330
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...
_________________________
2011 F150 4x4 5.0L
1996 Mustang GT 5spd/ragtop

Top
#3467502 - 08/28/14 02:07 PM Re: De-glazed my rotors. [Re: Rylan]
Oldmoparguy1 Offline


Registered: 01/21/05
Posts: 5507
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
_________________________

A mile of roadway takes you a mile....A mile of runway takes you anywhere...

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


Registered: 07/21/13
Posts: 192
Loc: Dallas, 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.
_________________________
2010 Dodge Challenger
- Rallye Redline (3.5L+A5)
- 100+K miles (@3500/mo)
- Mobil Super 5K 10W-30

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


Registered: 04/09/08
Posts: 12339
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.
_________________________
18 Forester 2.5I Manual
00 Jeep Cherokee
01 Ford F-350 (long term rental)

Top
#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?

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


Registered: 12/19/04
Posts: 7370
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).

_________________________
"Internet discussion boards act as echo chambers for conspiracy dittoheads" A.Allen

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


Registered: 09/25/04
Posts: 6197
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
_________________________
'16 Camry LE STP synth 0w20 and STP filter.

1994 Ranger ,the Rat, 5w30 dino, STP filter

'16 Camry SE, Valvoline bulk 0w20 and ? filter

Top
Page 1 of 2 1 2 >