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Originally Posted by Gforce
Braking system cannot be sealed.
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When the cap is on, it's sealed. The reservoir isn't open to the atmosphere.
Quote:
Originally Posted by Gforce
You'll need to explain the heat impulse idea. The capacity remark is also incomplete.
Are you talking about making a hot brake system suddenly hotter when you first apply the brakes hard or a cold system suddenly hot?
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What he means by heat impulse is that the amount of braking force required to stop a given car at a given speed on a flat surface is constant. If you don't change tires, traction is also constant. Since the main force stopping the car (ignoring air and rolling resistance) is the brakes, the amount of work they do is also constant. Adding pads that can take more heat, or rotors with thermal mass don't change how much work the braking system has to do. It just changes how much heat it'll tolerate before fading, or how fast it can shed heat.
There's nothing incomplete about the capacity remark, he's just talking about thermal capacity... not fluid capacity like you're assuming.
Quote:
Originally Posted by Gforce
Are you suggesting the BRZ needs larger brake caliper cylinder volume?
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Again, no.
Quote:
Originally Posted by Gforce
My point is that any road car needs brake pads that deliver maximum performance from cold. The very first stop of the day might be your last. Using track pads on the street is just plain dangerous.
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You're assuming that track pads are worse than stock when cold, which just isn't the case for all of them. I wouldn't run an endurance pad on the street, but they have narrow operating temp ranges and are a different beast. There are TONS of track pads with huge operating temp ranges that are significantly better than OEM on the street, and get even better when hotter. Sure they make noise and dust, but they have more bite/torque.
Quote:
Originally Posted by Gforce
You'll need to explain this one. You must mean the car needs bigger caliper pistons. There's not much fluid circulation in a brake hydraulic system unless ABS is working hard.
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No, he means thermal capacity. There's not enough thermal mass in the rotors to absorb/dissipate heat fast enough.
Quote:
Originally Posted by Gforce
How do you know the track pads bite harder? Have you measured the difference in stopping distances? I think you may be surprised. Your other remarks about the issues harder pads can cause are important considerations for anyone thinking of upgrading pads.
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1) the co-efficient of friction, which isn't open to interpretation, it's a physical property and hard fact. You might want to go back and revisit how co-efficients of friction work to see how your earlier comment about higher line pressures is also incorrect.
2) Because unlike you, we've actually driven it back to back vs stock pads and immediately felt it. If I let anyone drive my car their first stop, from cold, they always brake WAY too hard when they're just trying to give a tiny bit of brake. Like stopping 10m before where they intended to, even from 50km/h and not a panic stop.