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My rear brakes last only half as long as the fronts. Heat is the issue. The rear brake heat problem has led to me having to replace the wheel bearings and hubs as well.
When I was running lower temp brake pads, my rears died first. As I kept moving up to higher and higher temp brake pads, the pattern of wear shifted such that my rears lasted about 50% longer than the fronts.
I think this means that I was fading the fronts a bit and making the rears do too much work, but now I don't overtemp the fronts and so the rears last longer. But I have never tried to actually measure this.
Originally Posted by mikegarrison,Nov 15 2008, 09:29 AM
When I was running lower temp brake pads, my rears died first. As I kept moving up to higher and higher temp brake pads, the pattern of wear shifted such that my rears lasted about 50% longer than the fronts.
I think this means that I was fading the fronts a bit and making the rears do too much work, but now I don't overtemp the fronts and so the rears last longer. But I have never tried to actually measure this.
I came to the same conclusion many years ago around the time good high temp pads were becoming available for the S2K.
I'm fairly certain its just a brake pad compound balance issue front to rear.
Originally Posted by trump26901,Nov 14 2008, 09:05 PM
"seems" get an IR thermometer and measure those bad boys. I measure mine after every track session and I come in w/ fronts and rears ~450+-15F after a cooldown lap.
If you are using OEM pads and overheating them, then the rears could be hotter... I melted my OEM pads at the track my first time out and I actually killed my rears before my fronts because they do get a little hotter first.
My setup is 100% stock and the bias is even (ABS engages on all wheels at the same time).
i did use my infrared temp gun on it and the front showed 480* F but the rear was too hot and the temp gauge just error out because it couldn't read that high. so i don't know exactly how much hotter the rear was compare to the front, but when i put my hand close to the rotors i could definitely tell it was hotter. this is just from driving on street with street tires. i will get a temp gun that can read higher temp and will monitor the temp closely at the track.
I had my rear left rotor dissappear on me at VIR last August at the end of a race, at the end of the front straight. I ended up running into a BMW which slowed me down going off track.
I had always assumed the rotor just broke upon impact and that is why it wasn't there when my car made it back to the Pits. I thought that I ****ed up and didn't brake in time for the turn until what recently surfaced with Cale.
It sounds like Cale had a very similar situation but with the misfortune of having nothing to slow him down.
At the time, my rear rotors had 44k street miles plus maybe 6-8 track days. I do not know about Cales. I had never given it any thought to replace rear rotors in any of my tracking.
i guess we should all plan to put NEW rotors on the rears at least every year.
I did not take any pics of the rotor area due to my usual lack for details.
You can barely see Scot's incident here in my rearview:
^ you can see that I hit him pretty hard...... it is hard to tell what the hell happened if it was just my stupidity or something broke causing me to do that.... 1 month ago i sprayed gravel all over the place for Eric, so i do go off in brake zones here and there....
i just remember everyone noticing at VIR, my missing rear rotor.... definately should have taken pictures...
^ you can see that I hit him pretty hard...... it is hard to tell what the hell happened if it was just my stupidity or something broke causing me to do that.... 1 month ago i sprayed gravel all over the place for Eric, so i do go off in brake zones here and there....
i just remember everyone noticing at VIR, my missing rear rotor.... definately should have taken pictures...
6 -- Scot, Ill pay you double what my competitors are paying you
Originally Posted by hondaf1,Nov 15 2008, 05:14 PM
i did use my infrared temp gun on it and the front showed 480* F but the rear was too hot and the temp gauge just error out because it couldn't read that high. so i don't know exactly how much hotter the rear was compare to the front, but when i put my hand close to the rotors i could definitely tell it was hotter. this is just from driving on street with street tires. i will get a temp gun that can read higher temp and will monitor the temp closely at the track.
if you are hitting 480 on OEM pads, you are definitely over-temp on them. If you are driving that way, you need to put on some racing pads and youll probably see the bias get corrected since the fronts won't overheat and cause the back to do more of the work.
get an IR thermometer and measure those bad boys. I measure mine after every track session and I come in w/ fronts and rears ~450+-15F after a cooldown lap.
Hard to say... so many variables.
