What causes glazing? Is it from overheating the brakes or from poor quality pads? I bought the car and it had been sitting so at first I thought it was just just that needed to be worn off. The car has Sumitomo pads in the front and I do not know what is on the rear. I think I only felt fading once during an autocross but other than that the brakes function OK.

1991 convertible with stock 4 piston aluminum calipers in the front.

 

No. 1 Cause is improper bedding.

No. 2 Cause is not resurfacing rotors when switching pad material

No. 3 Cause is overheating.

 

So the glazing was probally caused by the rust changing the surface of the rotor and instead of the pads cleaning the rotors they ended up glazing them.

 

Is this some kinda performance brake pad?
If not, you can't expect them to handle even slightly elevated driving.

Autocross doesn't normally get the brakes hot enough for them to fade.

Change the brake pads to something a bit more performance oriented.
Try Hawk HPS is you can...


-Ted

 

wrong thread

 

For my money, Hawk HPS is the only pad worth buying for anything other than track use. I have been using them for years and couldn't be happier.
On a side note, I'm sure my rotors are getting glazed. They had mega surface rust from sitting for 20 moths and I just used them to wear it off.... Oh well.

 

Haha when I read the title, I thought he was referring to a 4-rotor engine, and I wondered what the hell a glazed rotor in the engine was....

...just thought I'd share...