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#1609057 - 09/23/09 05:04 PM What causes brake pads to glaze over?
zulu Offline


Registered: 01/21/08
Posts: 528
Loc: Kansas
My 08 Malibu with 21K on it developed squeaky brakes a month ago. Took it into the dealership and they said there was a TSB for squeaking brakes... apparently the pads glazed over and they had to "de-glaze" them and clean the rotors.

It has been fine for the last 20K miles, and I've owned the car since brand new with 50 miles. Proper break-in procedures were followed per the owners manual according to brakes and engine speeds.

What causes pads to glaze over? Anything I can do to prevent it again?
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#1609061 - 09/23/09 05:11 PM Re: What causes brake pads to glaze over? [Re: zulu]
wirelessF Offline


Registered: 10/04/07
Posts: 1606
Loc: Oahu, Hawaii
Do you do a lot of downhill driving? If possible use engine braking.

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#1609065 - 09/23/09 05:13 PM Re: What causes brake pads to glaze over? [Re: wirelessF]
zulu Offline


Registered: 01/21/08
Posts: 528
Loc: Kansas
I live in Kansas. There are no hills... LOL
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#1609068 - 09/23/09 05:16 PM Re: What causes brake pads to glaze over? [Re: wirelessF]
brianl703 Offline


Registered: 05/07/04
Posts: 10491
Loc: Manassas, VA
I don't know if was caused by "glazed" brake pads, but I've fixed squeaky brakes on two cars by repeated application of the brake pedal from 55MPH till about 10MPH. (You need a road with light traffic to do this). Get the brakes good and hot (you'll start smelling them), then drive at 55MPH for several minutes to cool them down.

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#1609079 - 09/23/09 05:38 PM Re: What causes brake pads to glaze over? [Re: brianl703]
Drew99GT Offline


Registered: 10/11/02
Posts: 21522
Loc: Colorado Springs
Welcome to GM factory brakes. Get used to it until you buy aftermarket pads/rotors.

We're dealing with the same thing on our 07 Impala and have dealt with the same thing on all previous GM products.

Pad glazing from excessive heat and warped rotors.

They'll cut the pads and rotors under warranty - forget trying to cut/resurface the rotors again - they'll be too thin and heat will be an even bigger problem.

As soon as aftermarket parts get thrown on, they'll go 50,000 + miles without problems.

That's what I've experienced.

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#1609115 - 09/23/09 06:33 PM Re: What causes brake pads to glaze over? [Re: Drew99GT]
bullwinkle Offline


Registered: 10/09/04
Posts: 5751
Loc: Cincinnati, OH, USA
Cheap pad material+heat=glazing/squealing. Aftermarket ceramic pads should solve your problem, GM rotors are usually too thin from the factory to regrind.
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#1609149 - 09/23/09 07:04 PM Re: What causes brake pads to glaze over? [Re: bullwinkle]
Eddie Offline


Registered: 12/07/03
Posts: 8180
Loc: Florida, Cape Coral
I think glazing is caused by very light braking application over many miles. Riding the brake pedal very lightly for long distances might be one example.
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#1609157 - 09/23/09 07:20 PM Re: What causes brake pads to glaze over? [Re: Eddie]
Boomer Offline


Registered: 09/19/08
Posts: 1811
Loc: Pennsylvania
I have had the opposite experience with GM brakes over the years. Current 2003 Saturn 63,000 miles and still has original brake pads and rotors at all four positions. Chevy truck had original front pads for almost 70,000 miles at which point I replaced rotors and pads with NAPA parts. Rear drum brakes were still original after almost 11 years and 110,000 miles.
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#1609578 - 09/24/09 08:44 AM Re: What causes brake pads to glaze over? [Re: Boomer]
Mr_Incredible Offline


Registered: 01/02/07
Posts: 1388
Loc: Nebraska
The brakes on my truck glazed over badly. I didn't drive it very often and rust would build up on the rotors between uses. Eventually, the pads and the rotors glazed.

I bought new pads (with a coating to help bed them in) and went to replace them. I was very surprised to see the installed pads still had a great deal of use left even at 80k miles. I wanted to unglaze everything and reuse but since I had to go to all that work to open everything up, and had already purchased new pads, I went ahead and replaced.

All four corners are still working well, even though I still maintain the same usage habits. It could be that there aren't enough miles on the new pads yet, or they have a more glaze-resistant compound. Dunno.


Edited by Mr_Incredible (09/24/09 08:44 AM)
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#1609595 - 09/24/09 09:06 AM Re: What causes brake pads to glaze over? [Re: Mr_Incredible]
swalve Offline


Registered: 06/03/05
Posts: 588
Loc: Chicago, IL
My impression is that the brakes continually get hot enough to develop a glaze, but not hot enough to simultaneously burn it off. If the brake compound and the size of the system are matched to the mass of the vehicle, this shouldn't happen.

My grand prix does this, I fix it by doing a couple of hard stops like brianl suggests. I try to do it more from 70 to 40 until I start to feel a little bit of fade. After letting them cool off, the car stops great.

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#1609760 - 09/24/09 12:06 PM Re: What causes brake pads to glaze over? [Re: swalve]
mechtech2 Offline


Registered: 09/05/06
Posts: 19479
Loc: Chicago Area
All pads and shoes 'glaze'.
Unless they are brand new, this is how all used brake material looks.
Sanding them will always get rid of noise for a short while - maybe longer if there was foreign material on them.

The future? Keep the calipers and shoes lubed at any points of movement. Use the best pads that you can get your hands on.

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#1609963 - 09/24/09 03:18 PM Re: What causes brake pads to glaze over? [Re: Drew99GT]
Anies Offline


Registered: 01/29/09
Posts: 2804
Loc: NJ
Originally Posted By: Drew99GT
Welcome to GM factory brakes. Get used to it until you buy aftermarket pads/rotors.

We're dealing with the same thing on our 07 Impala and have dealt with the same thing on all previous GM products.

Pad glazing from excessive heat and warped rotors.

They'll cut the pads and rotors under warranty - forget trying to cut/resurface the rotors again - they'll be too thin and heat will be an even bigger problem.

As soon as aftermarket parts get thrown on, they'll go 50,000 + miles without problems.

That's what I've experienced.




You aren't kidding, on my Impala I had to change the rotors every 5-7k(and pads) because they would glaze & warp. After warranty I went aftermarket, bought slotted/cross drilled rotors and Bendix brake pads. After that I never really had problems, maybe every 25k i'd get the pads checked out and they were warrantied for the lifetime of the vehicle so I would get em changed out at every inspection for free =)

GM Rotors are horrible, many issues with them across several cars and is a widely or was a widely known problem.
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#1610031 - 09/24/09 04:42 PM Re: What causes brake pads to glaze over? [Re: Anies]
andyd Offline


Registered: 09/25/04
Posts: 4933
Loc: Marshfield , MA
I get all alone on a highway or an off ramp and jab the pedal several times. Deglazes brakes and is fun too. Light and slow brake application is the cause.
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#1610472 - 09/25/09 04:09 AM Re: What causes brake pads to glaze over? [Re: andyd]
mechtech2 Offline


Registered: 09/05/06
Posts: 19479
Loc: Chicago Area
I WANT glazed pads and shoes.

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#1610473 - 09/25/09 04:10 AM Re: What causes brake pads to glaze over? [Re: mechtech2]
The Critic Offline


Registered: 08/30/04
Posts: 18840
Loc: Walnut Creek, CA
Originally Posted By: mechtech2
The future? Keep the calipers and shoes lubed at any points of movement. Use the best pads that you can get your hands on.



Just watch out where you put the grease. It attracts a ton of dirt and makes your caliper look nasty. Strangely, despite all of the aftermarket propaganda to lube the caliper clips, shims, etc, all of the factory brakes that I've seen do not use any lube on the shims or the clips.
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