As DAEMANO mentioned,
Racingbrake rear two piece rotor aluminum hats are designed without compromising the integrity of OE's emergency brake.
How?
We integrate a iron sleeve into our rear rotor hat to allow the use of emergency brake. Do not be confused between "
Emergency" and "
Parking" brake.
"Emergency" brake is for you to use it during emergency when your hydraulic brake system fails, while the "Parking" brake is for you just to park the car.
If you go with an alternate rear two piece kit, that uses an all aluminum hat.
You run the risk of damaging the hat if you apply the emergency brake while driving. Which is why they will advise not to utilize your e-brake unless your only parking your car.
Being the reason why we design or rear hats with an iron sleeve,
to safety use your emergency brake the way its supposed to be. (OE)
Weights
OE 1-pc (290x18mm) = 13.4 lbs
RB 2-pc (330x22mm) = 12.8 lbs
OE Calier = 6.6 lbs
RB Caliper = 6 lbs
Total weight saving per corner = 1.2 lbs
for our matching front
we use a 332mmx25 two-piece rotor and our 4 piston calipers weighing
10lbs less that OE's stock brakes at each corner.