Nissan 370Z Forum - View Single Post - Some issues from a 2-day HPDE...

flashburn · 05-03-2011, 06:50 AM

So I wanted to get some opinions about some problems I started having at the end of my 2 day HPDE at Sebring.

1. My coolant level was at Max at the start of the event, by the end of the 2nd day, it was slightly above Min. I never saw water temps get too high, slightly over half way. Is this normal? I don't think I have a leak or anything, no stains in my garage.

2. Towards the end of the 2nd day, I started getting a really bad shimmy whenever I braked. It happened no matter how much braking I did, and was mostly felt in the steering wheel. It was doing it on the way home too. Acceleration was fine. I swapped back out to my street pads (and wheels) once I got home, and the problem isn't there, everything feels fine. I didn't notice anything odd about the pads, they have about half life left.

3. I noticed on the way home that not only were the brakes squealing a lot when going slow, but even at speed if I broke even slightly. I know squealing at low speeds is normal for Carbotech's, but what about at high speeds? When slowing it sounded really bad, like it was metal on metal (as if the pads were completely worn I guess is what I was thinking. I did notice that the Ceramic brake lubricant had completely turned to dust when I removed the brake pads. Would that be the reason why? Any harm in driving under these conditions?

Thanks guys. I'll post my other thoughts (and videos) later.

05-03-2011, 06:50 AM	#1 (permalink)
flashburn A True Z Fanatic Join Date: May 2009 Location: Central Florida Posts: 1,884 Drives: '12 Corvette GS 6M Rep Power: 19	Some issues from a 2-day HPDE... So I wanted to get some opinions about some problems I started having at the end of my 2 day HPDE at Sebring. 1. My coolant level was at Max at the start of the event, by the end of the 2nd day, it was slightly above Min. I never saw water temps get too high, slightly over half way. Is this normal? I don't think I have a leak or anything, no stains in my garage. 2. Towards the end of the 2nd day, I started getting a really bad shimmy whenever I braked. It happened no matter how much braking I did, and was mostly felt in the steering wheel. It was doing it on the way home too. Acceleration was fine. I swapped back out to my street pads (and wheels) once I got home, and the problem isn't there, everything feels fine. I didn't notice anything odd about the pads, they have about half life left. 3. I noticed on the way home that not only were the brakes squealing a lot when going slow, but even at speed if I broke even slightly. I know squealing at low speeds is normal for Carbotech's, but what about at high speeds? When slowing it sounded really bad, like it was metal on metal (as if the pads were completely worn I guess is what I was thinking. I did notice that the Ceramic brake lubricant had completely turned to dust when I removed the brake pads. Would that be the reason why? Any harm in driving under these conditions? Thanks guys. I'll post my other thoughts (and videos) later. __________________ Current Ride: 2012 Chevrolet Corvette Grand Sport Centennial Edition Carbon Flash 6M Previous Ride: 2009 Nissan 370Z Sport Platinum Graphite 7AT