Quote:
Originally Posted by LarryBible
Julio,
I expect that you are pretty careful with tire foam. Not everyone is. They just spray it all over.
The stuff does not simply get wiped off by the pads. It reacts with the pads to glaze a portion of the rotor. Sometimes this problem will clear itself up after awhile but if a hard braking is done from speed while a glob is still on the rotor, it can be permanent or near permanent, requiring the rotor to be cut or replaced. I've seen it.
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Maybe you can describe how ANYTHING could stay on a brake disc at "speed?" As for me, I use P21S and flood the discs and calipers during washing to get rid of some of the brake dust.
BTW, the experts will tell you that MB discs are not turned but instead are ground with a blanchard grinder.