The rotor is zinc plated, which is nice as the non-friction surfaces won’t get all rusty and nasty looking and rusty water won’t drip out of your rotors to stain your wheels. The only drawback with zinc is you must drive and brake gently at first to scrape it off the friction surfaces before you bed your pads in or the zinc will transfer onto the pads surface and potentially cause juddering.
You can also see Brembo’s Type 3 rotor face grooving. The Type 3 grooving is aggressive and actually improves the pad bite initially, has more aggressive friction characteristics and releases smoothly. The groove pattern is designed to provide a lot of biting edges without causing uneven wear.
You can also see how the anti-rattle springs put tension on the rotor to reduce noise. Note just how thick the friction faces are on the high thermal spec rotor. You can also see how the zinc plating extends down into the vents of the rotor.
The Race Technologies/Brembo rear rotor is externally the same dimensions as stock, 380mm in diameter and 30mm thick. The Brembo rotor weighs 22 lbs vs the stock 27.8 pounds for a weight savings of 5.8 lbs per side. This makes for an overall loss 6.4 lbs for the entire Race Technologies brake upgrade over stock when you subtract out the weight gain of the front rotors.
When you count the weight savings of the wheels and suspension, the overall loss of weight from the car approaches 50 lbs so far. Considering the most of this is unsprung weight and/or rotating weight, the lost is pretty considerable from a performance standpoint!
The new rear rotor, like the front, is also the high thermal spec internally thicker rotor, and its friction face is wider than stock. Even though the friction ring is a lot heavier than stock, the hat is so much lighter than stock, causing the overall weight to be lower.
You can also see the hat’s standoffs for air circulation between the hat and the friction ring.