Cool. That's pretty quick, but I would think during a race they would get even quicker
That's about how long it takes in a race, 10 to 15 minutes. They just do the whole hub assembly with the brakes already filled to pressure. The other end of the brake line has a special shutoff - and there's reserve fluid to keep air out of the system. You see 'em changed sometimes in 24 hour races. You used to sometimes see it in shorter races, but brakes are pretty sturdy these days (when you spend 10k on each corner's worth of brakes).
Yeah you would only have to change that after a crash
They still (sometimes) wear out during a 24 hour race, but I don't think every team takes the 15 minutes to change them.
I want to say one series actually requires a brake change, but I can't recall which. They enforce the change to make the field more level and about the driver - not about the car. So, if one team can afford really good brakes, they don't get a time advantage over teams who couldn't afford them. I think it's still a mandatory stop in some series.
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