spatula?
this?

 

Yep.

 

what about the idea that caliper should be cooled first.
especially when you have 2 piece rotors with curved directional vanes?

 

Cooling the brake rotor is key. The surface area of the disc is what's losing its efficiency when it heats up. The cooler the rotor is the cooler the pads will be the cooler the fluid will be. Cooling calipers only by them selves sounds like a bad idea. Using the vanes in the rotor for what they're designed for is the best way to cool your braking system.

 

i absolutely agree on the temperature of contact area - but absolutely not sure that rotors surface temp is more important than pads surface temp (and pads+caliper+brake fluid temp in general).

my understanding is that when brakes system "loose it" - it's not rotor that looses it but the pads or/and brake fluid due to overheat.
feel free to corrcet me if i'm wrong.

now let's look at the scenario:
- hard braking was performed
- pads and rotors temp have reiased to [let's say] 800F
- rotors are spinning and got cooled via internal vanes and after 8 seconds their temp have dropped to 700F
- do you thing that pads+calipers+brake fluid got cooled down to the same temp or lower? i suspect they are NOT
- next braking zone - rotors are at 700F. pads+calipers+brake fluid are at [let's say] 750F

if i'm getting this right - it looks like calipers are the ones which really need a help with extra cooling and not the rotors.

please discuss.

 

my examples on temperatures were based on SOS measurings:

 

Cool the rotors and the calipers will run cooler. This has been the racing industry standard for a reason.

 

OK - this a good argument

but what's the explanation for it?

 

It was explained. How much more explaining does it need?

 

Calipers aren't generating the heat... the friction between the pad and the rotor are generating the heat. it's always best to attack the source of the issue.

keep the friction area cool, everything else will cool down too. Cool down just the caliper, and it won't cool down the rotor/pad/friction area.