| Mass does not dissipate heat. The properties your probably thinking of are heat capacity and thermal conductivity. Both of those properties will dictate how much heat you can dump/store into your brake setup spontaneously without altering braking performance characteristics. You want both as high as possible. Higher mass allows you to store heat. Ultimately, heat dissipation is governed by air cooling over the brake components. The heat transfer coefficient for air varies for forced cooling based on air velocity and temperature differential between brake components and the air itself. That brake cooling deflector on your tension rod is actually helping a bit. ?? The way to look at it is that your brake components hold the heat until forced convection cooling can dissipate it.
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