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If you’ve driven it that hard to worry about warping discs then just stopping the car for any amount of time is going to be a problem because the heat can’t dissipate well where the calipers cover the discs.
Pulling your handbrake makes no difference because it activates pads that work within the ‘bell’ of the disc, not the caliper’s pads. Hope that makes sense. If anything the handbrake pads might melt onto the disc bell. Usual track day practice is to have a cool down lap and leave the car without the handbrake on when in the pitlane.
Last thing to say is that discs generally don’t warp. What people are referring to is pad deposits left on the discs from overheating.
In all honesty, unless you’ve been hooning it on roads like in the Alps, then you’re not going to need to worry about applying your handbrake when you stop.
Hope this helps.
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