Quote:
Originally Posted by DR 86
No need to change the fluid all the time. If you're on stock tires, you probably won't be generating enough grip and carrying enough speed into braking zones to over heat the stock brake fluid for lapping days, but I'd change the fluid to something that can withstand more heat just to be safe. After that, just change the fluid at regular maintenance intervals (sooner if you are tracking a lot) or if you ever boil the fluid. I wouldn't use track pads on the street, as you won't be able to generate enough heat on the rotors with daily driving to maintain the transfer layer of brake pad compound, and very soon after your track day you will be enjoying a symphony of squealing pigs.
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Quote:
Originally Posted by AZP Installs
By "track pads" what do you mean?
Also if you only have 1k miles no need to flush the brake fluid.
As was stated if you have the OEM Prius tires you won't be taxing the brakes with them. I barely taxed my brakes with STi OEM Summers and 10+ years of track experience...
-mike
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I think it depends almost entirely on the track in question. Myself and a few other owners have boiled the factory fluid on stock rubber, but my local track has two long straights into heavy braking zones.
As a rule I change out brake fluid before an event if it has been in the system for more than 4 months (to get rid of any water that has been absorbed) or if it has already been through a track day (to get rid of any bubbles that may have formed in the system). If the thermochromic paint I apply to the outside of my brake rotors is accurate, I'm sitting right around 700 C on the later runs which would likely translate into some pretty crispy stock fluid (but that is on some stickier tires).