Forged Narrow Superlite 4R Rear Electronic Parking Brake Kits provide the ultimate Big Brake solution for popular muscle car rear axles that require a parking brake. FNSL4R four piston calipers, 13" or 14" two-piece rotors, and high performance BP-10 compound pads provide optimized and balanced braking to compliment front big brake upgrades on all types of custom, show and high performance street machines. The unique Electronic Parking Brake caliper provides a static high torque static holding power for parking without mechanical cabling. Supplied with control unit and harness assembly, it simplifies installation and use. Optional caliper finishes and rotor designs enable the builder to personalize the style and optimize brake performance for every individual application.