Quote:
Originally Posted by FTS
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(1) the pads oxidize with heat and be consumed
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I change these pads before reaching 50% wear, because I am told by Pagid and others that as the pad thickness decreases and consequently their heat sink capacity, I would be exchanging the wear with rotor oxidation. It is important to keep the rotors below oxidation temps, 1150 Fdeg in the case of MCCBs. Thus far I have been able to do that.
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In reading this there are a few points that spring to mind:
I don't believe the pads are of the same construction as the discs and that it is only the discs which are subject to oxidising wear.
The 50% wear limit is not due to heat sink capacity but for reduced thermal insulation leading to more heat being transferred into the callipers and thus the brake fluid.
The temperature indicating paint is showing the temperature at the periphery of the disc, about as far from the heat generation area of the disc and in the area of most cooling air flow. I would expect the braking surface to be subject to a significantly higher temperature.