Brake Noise - only when pads are warmed up

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What causes brake pads to become noisy, but only once warmed up?

I road tested a vehicle yesterday and noticed the rear brakes emitted a nasty grinding sound upon coming to a complete stop. However, the brakes have to be moderately warm in order for the noise to be duplicated.

The pads appear to be Wagner Quick Stop. They are also paired with uncoated white box rotors. Overall, a very low-end set of parts. The pads are near-new and the rotor surface condition is perfect.
 
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Sometimes pads need to be 'fitted' a bit, not a reason to throw them away. It doesn't happen often but still does. A year or so ago I was changing pads on a RAV4 and one pad had to have one ear filed a bit.
Completely agree, although it's a time suck for the professional.

A couple thou is the difference between a slip fit and a press fit.....
 
I wasn't the one who did this brake job....and since the vehicle is getting sold, I'm not messing with it. :D

Was really just curious...
 
If pad ears need filing throw them In the scrap pile and buy something that fits.

It shouldn't happen, but it happens sometimes, even with reputable brands like Ferodo, Textar etc..
Probably it doesn't require a workshop 'file', quite often these are appropriate, just to trim back a bit of paint from the pad's ears:

ebelin-nagelfeile-sensitiv

img_product-d37da32d18e91491365fe389b51dca62.jpg
 
What causes brake pads to become noisy, but only once warmed up?

I road tested a vehicle yesterday and noticed the rear brakes emitted a nasty grinding sound upon coming to a complete stop. However, the brakes have to be moderately warm in order for the noise to be duplicated.

The pads appear to be Wagner Quick Stop. They are also paired with uncoated white box rotors. Overall, a very low-end set of parts. The pads are near-new and the rotor surface condition is perfect.
It could be just a compound. Noise is very common in track/racing pads. I currently have HAWK HP+ in front for track purposes, but, how to explain, everyone in the neighborhood knows when I come back home.
In cheap applications that happens, bcs. well, cheap.
 
Must be just me, as a professional mechanic, that hasn’t had the need in all the pads I’ve fitted ,of decent quality, to file any of them down. This is a cheap pad problem or a rusted pad carrier problem. Are all those that are filing down pads re applying the powder coat to stop the metal from rusting? Thus locking the pad into the carrier. If your in an area that spreads salt this will be a guaranteed problem.
 
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What happened to pride in your work, I wouldn’t do to a customers car what I wouldn’t do to my own.
Welcome to flat rate, where cutting as many corners as possible on gravy work makes up for poor paying warranty work.
 
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