OK, so I replaced the cracked rear rotor. (Reference my post from last week on this topic: http://www.nsxprime.com/forums/showthread.php?t=95581)
The link below has pictures of my new rotor after having been bedded in, and a picture of the cracked rear rotor.
My suspicions about the brake pads exerting uneven force on the rotor seems to be confirmed. View the picture of the new rotor. Its contact area is being only half used. The half of the contact area nearest the hub is getting all the contact. The area closest to the outer edge of the rotor is going virtually untouched. So, when using it on the track the uneven heating and then cooling is cracking the rotor, I suspect.
The other picture is the cracked rotor. It is likely not a coincidence that the two cracks are approximately the width of the caliper apart. Probably being caused by the rotor cooling, and the area under the caliper retaining heat while the rest of the rotor cools.
http://www.nsxprime.com/photopost/showphoto.php?photo=30395&cat=500&ppuser=13387
Here's the kicker: the pads (Cobalt GT Sport) are not wearing more near the hub, as you would think based on the wear on the rotors, but are actually thicker near the hub! Now that is really confusing me.
Questions:
1. Does the collective concur that the cracking is being caused by the uneven pad contact?
2. What could be causing the uneven pad contact?
3. These pads do not have return springs. Does the NSX not use return springs on the rear pads?!?
4. Why would the pads be wearing unevenly, but the opposite what I would be expecting (if the rotor is being touched only near the hub, shouldn't the pads be thinner near the hub)?
So many questions!
Thanks for all the help in this and the last post!
The link below has pictures of my new rotor after having been bedded in, and a picture of the cracked rear rotor.
My suspicions about the brake pads exerting uneven force on the rotor seems to be confirmed. View the picture of the new rotor. Its contact area is being only half used. The half of the contact area nearest the hub is getting all the contact. The area closest to the outer edge of the rotor is going virtually untouched. So, when using it on the track the uneven heating and then cooling is cracking the rotor, I suspect.
The other picture is the cracked rotor. It is likely not a coincidence that the two cracks are approximately the width of the caliper apart. Probably being caused by the rotor cooling, and the area under the caliper retaining heat while the rest of the rotor cools.
http://www.nsxprime.com/photopost/showphoto.php?photo=30395&cat=500&ppuser=13387
Here's the kicker: the pads (Cobalt GT Sport) are not wearing more near the hub, as you would think based on the wear on the rotors, but are actually thicker near the hub! Now that is really confusing me.
Questions:
1. Does the collective concur that the cracking is being caused by the uneven pad contact?
2. What could be causing the uneven pad contact?
3. These pads do not have return springs. Does the NSX not use return springs on the rear pads?!?
4. Why would the pads be wearing unevenly, but the opposite what I would be expecting (if the rotor is being touched only near the hub, shouldn't the pads be thinner near the hub)?
So many questions!
Thanks for all the help in this and the last post!