Cause of rotor glazing?

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OK, so we all know about rotor runout, and improper break-in/bedding. Still, I was pondering why my new-to-me, old, low-mileage Camry ended up with rotor glazing causing serious brake shudder, as it had no runout to speak of. Of course, I don't know its entire history since I am not the first owner, but an incident with a kamikaze driver taking a left exit from the right lane while going 1/2 the prevailing speed, causing me to activate ABS, got me thinking.

The ABS, on my cars anyway, is fairly rhythmic and even in pulsation. What if the ABS pulses "on" hit, more often or not, the same spot on the rotor all the way down to stop, while the system was already hot? Sounds like a recipe for pad imprinting.
 
Originally Posted by HangFire
What if the ABS pulses "on" hit, more often or not, the same spot on the rotor all the way down to stop, while the system was already hot? Sounds like a recipe for pad imprinting.

Well, the ABS pulses (when activated) are randomized in relation to the rotation of the rotor. You might get lucky (or unlucky) sometimes, but the events are not related.

So there's that...
cheers3.gif
 
Last edited:
I've seen more than a few drivers pull away from me on the highway with their brake lights on....
usually an older operator behind the wheel, two-foot driving. THAT will heat the pads & start glazing.
Maybe your previous owner was one of those?
 
Originally Posted by Imp4
Originally Posted by HangFire
What if the ABS pulses "on" hit, more often or not, the same spot on the rotor all the way down to stop, while the system was already hot? Sounds like a recipe for pad imprinting.

Well, the ABS pulses (when activated) are randomized in relation to the rotation of the rotor. You might get lucky (or unlucky) sometimes, but the events are not related.

So there's that...
cheers3.gif


OK, but it doesn't feel random.
 
Originally Posted by vw7674
I've seen more than a few drivers pull away from me on the highway with their brake lights on....
usually an older operator behind the wheel, two-foot driving. THAT will heat the pads & start glazing.
Maybe your previous owner was one of those?

Could be...
 
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