Excessive heat is the enemy of a high-performance brake system. Not only can the pad compound glaze over and result in a sudden loss of braking power, extreme high temperatures can even cause hydraulic brake fluid to boil. Cooling disc brake pads are designed and built to pull heat away from the braking surface and into cooling fins above the brake, where it can be safely dissipated into the air. WHEN TO USE: For riders that push their bikes to the limit, Elite Cooling pads keep their brakes working their best, even on the biggest descents.Compatibility: Red eTap AXS HRD; Force eTap AXS HRD; Rival eTap AXS HRD