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Horrible scratching sound from rear rotors on track day
Happened to me yesterday at Thunderhill after 2nd laps session both the rear wheels, especially right wheel sounded horrible like metal over metal scrape. Few folks looked at it and Porsche experienced mechanic took flathead and moved the heat shield behind right brake rotor a bit, hence relieving it a bit but it still sounds horrible. Tried backing up car few times to get any rocks or debris out but invain.
Question: I had brakes and rotors replaced by Porsche workshop and wondering if heat shields is something they tinkered with or forgot to replace? Thoughts on this? I plan to talk to service manager on Monday ...
They may have bent the heat shield in one direction, causing some rubbing. Definitely have it looked at since it is probably something simple but with a noise like that you dont want that happening longterm. Just weird that it is happening on both sides. Normally I would think they would forget to bend it back just on one side, not on both. Maybe incorrect rotors or something, but that seems uncommon too.
Thanks- yes it only happened after very hard braking at the track, prior it was alright. I am definitely going to connect with the service manager tomorrow.
I often have trouble with my rear heat shields at the track. Be sure that when you pry one area away from the rotor it doesn’t twist/bend such that another area gets closer and starts to touch.
While it seems like a poor design it isn’t a big deal as I’m usually flipping my tires from side-to-side at the end of the day anyway, so a little heat shield tweak while I have the wheel off is now part of the process.
Here’s how these look like..which the workshop straightened out and it’s fine now. I’m still stumped how it really happened as track looked reasonable clean..well I know it now
I think has to do with the way it is made and mounted to the wheel carrier. The heat shield expands when it gets hot but the locations where it is bolted can’t move under expansion so it causes the remianing unbolted sections to warp oddly. I have discovered I get the same warp pattern every time, just the way it relieves heat stress.
03-10-2019, 04:44 AM
Horrible scratching sound from rear rotors on track day
