Project WRX V.08 - Tech
The new 13-inch floating rotor uses an aluminum hat that allows for axial and radial expansion so the rotor always stays aligned with the caliper and pads. This reduces pulsing as well as relieving stress from the different thermal expansion rates of the iron rotor ring and aluminum hat. The AP Racing rear big brake upgrade uses a four-piston cast aluminum caliper, a 13-inch two-piece rotor and beefy prototype caliper bracket. Our prototype unit uses an aluminum hat, which also acts as the drum for the integrated parking brake. Production units will use a more robust steel hat.
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