The Hawk Performance HB850Z.655 is a rear disc brake pad in the manufacturer's Performance Ceramic (PC) compound, with a .655 thickness designation. The manufacturer describes its PC pads as extremely quiet and ultra-low dust, with improved stopping power, stable friction output, and gentler wear on rotors for longer pad life. The manufacturer also states that all Hawk Performance compounds are not compatible with carbon ceramic rotors and that its pads are designed for iron or metal rotors. Buyers with a carbon ceramic brake setup should look elsewhere. For a 911, Cayman, or Panamera running standard iron rotors, the PC compound is a quieter, cleaner-running alternative to stock rear pads. Keep in mind that the PC compound is positioned for street and daily-driven use, so it is not a race compound. Owners searching for a rear Porsche 911 performance ceramic pad with low dust and iron-rotor compatibility will find this part fits that need.
Fitment is the first thing to verify. The manufacturer lists the pad for several 911, Panamera, and Cayman applications, but year and trim ranges differ across sources, so confirm your exact VIN and brake equipment with the manufacturer before ordering. For the install, the manufacturer's general procedure calls for installing the pads properly, making sure they sit securely in the caliper, and checking brake fluid. The manufacturer also recommends that old rotors be resurfaced or replaced if they have deep grooves, and that a previous compound's transfer film be cleaned off the disc before new pads go on. Bedding in is required before normal driving, and the manufacturer's street procedure is short and specific.
No. The manufacturer states that all Hawk Performance compounds are not compatible with carbon ceramic rotors, and that its pads are designed to work with iron or metal rotors.
The manufacturer's street procedure calls for 6 to 10 stops from approximately 30 to 35 MPH using moderate pressure, followed by 2 to 3 harder stops from approximately 40 to 45 MPH. Do not drag the brakes, then allow about 15 minutes for the system to cool before normal driving.
The manufacturer lists fitment for several 911, Panamera, and Cayman applications, and year and trim details vary between sources. Confirm your exact VIN and brake equipment with the manufacturer before ordering.
Rear pad replacement on these cars is a standard brake job, but it is worth checking a few things first. Per the manufacturer's general guidance, check the brake fluid and inspect the calipers for free movement, and lubricate sliding points where needed. Clean the rotor surface with fine sandpaper or 130-grit paper, using moderate pressure, then wash it with soap and water. Oil, grease, or brake fluid left on the disc can contaminate the new pads and disrupt the bed-in. Make sure the pads sit squarely in the caliper, then bed them in as described above. Avoid dragging the brakes during the bed-in, and let the system cool fully before any hard use.
