Keep in mind that it's not the piston that comes into contact with the
rotor, but rather the metallic backing on the brake pad. I tend to doubt
that the notches in the caliper body are cut shallow enough to prevent the
pad's metal backing to contact the rotor (I've never let mine get that worn)
as that would allow the pad to wear to a point at which it no longer
contacts the rotor because the piston bottoms out. That would cause a brake
failure - although not a sudden one - and doesn't sound like a good
engineering decision as rotors are considered wear parts and the piston
wouldn't touch the rotor anyway unless the pad fell out of the caliper or
something.
Brian '69 2000
Tampa, FL
http://web.tampabay.rr.com/oilleak/
-----Original Message-----
Also, in answer to the question about stops to prevent metal to metal
contact, that appears to be the case. Look at the drawing here:
http://www.hyedracyl.com/instruct.html
it clearly shows a notch cut to clear the piston that stops short of the
piston being able to contact the rotor.
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