{"product_id":"hawk-hb850c-655-hpx-rear-brake-pads-2014-2017-porsche-911-gt3","title":"Hawk 14-17 Porsche 911 GT3 HPX Motorsports Rear Brake Pads","description":"\u003ch4\u003eConsistent Rear Deceleration for the Naturally Aspirated GT3 on Circuit\u003c\/h4\u003e\n\u003cp\u003ePorsche's 991.1 and 991.2 generation 911 GT3 models are factory tuned for road-course precision, and their rear braking systems demand a compound that preserves that same balance under sustained heat loading. Hawk Performance part HB850C.655 applies the HPX motorsports compound to the rear axle of 2014 through 2017 Porsche 911 GT3 vehicles, delivering the smooth initial bite and clean release characteristics that let drivers carry higher corner entry speeds with repeatable confidence. HPX is a motorsports-only compound, not rated for street use.\u003c\/p\u003e\n\n\u003ch4\u003eKey Features\u003c\/h4\u003e\n\u003cul\u003e\n \u003cli\u003eHPX compound code \"C\" validated medium-temperature motorsports friction material\u003c\/li\u003e\n \u003cli\u003eOptimal temperature range: 100 to 600 degrees F; operating ceiling: 700 degrees F\u003c\/li\u003e\n \u003cli\u003eSmooth initial bite and clean modulation consistent with the precision brake bias of the 911 GT3\u003c\/li\u003e\n \u003cli\u003eHB850C.655 engineered for the rear PCCB-compatible iron rotor caliper on the 991-generation GT3\u003c\/li\u003e\n \u003cli\u003eExtensive dynamometer and field testing validation by Hawk Performance engineering\u003c\/li\u003e\n \u003cli\u003eNot compatible with Porsche Carbon Ceramic Composite Brake (PCCB) rotors\u003c\/li\u003e\n \u003cli\u003eRace-use configuration shims not included\u003c\/li\u003e\n \u003cli\u003eHawk Performance limited lifetime warranty on HB850C.655\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch4\u003eWhat's Included\u003c\/h4\u003e\n\u003cul\u003e\n \u003cli\u003eOne set of Hawk HPX rear brake pads (HB850C.655) for the 2014-2017 Porsche 911 GT3\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch4\u003eInstallation Instructions\u003c\/h4\u003e\n\u003col\u003e\n \u003cli\u003eSupport the vehicle on jackstands with the rear wheels removed.\u003c\/li\u003e\n \u003cli\u003eRemove the caliper guide pin bolts and free the caliper from the bracket support it with wire rather than hanging by the flexible hose.\u003c\/li\u003e\n \u003cli\u003eSlide the worn pads out of the caliper bracket and clean the pad contact channels.\u003c\/li\u003e\n \u003cli\u003eCompress the caliper pistons as required and install the HB850C.655 HPX pads into the carrier.\u003c\/li\u003e\n \u003cli\u003eReinstall the caliper and torque the guide pin bolts to Porsche factory specification for the 911 GT3.\u003c\/li\u003e\n \u003cli\u003eReinstall rear wheels, torque lug bolts to factory spec, and pump the pedal until firm.\u003c\/li\u003e\n \u003cli\u003eConduct the Hawk bed-in sequence on track: six to ten progressive moderate braking events from 60 mph followed by two to three hard stops, with full cool-down periods between runs.\u003c\/li\u003e\n\u003c\/ol\u003e\n\n\u003ch4\u003eSpecs\u003c\/h4\u003e\n\u003ctable\u003e\n \u003ctr\u003e\n\u003cth\u003eAttribute\u003c\/th\u003e\n\u003cth\u003eDetail\u003c\/th\u003e\n\u003c\/tr\u003e\n \u003ctr\u003e\n\u003ctd\u003ePart Number (MPN)\u003c\/td\u003e\n\u003ctd\u003eHB850C.655\u003c\/td\u003e\n\u003c\/tr\u003e\n \u003ctr\u003e\n\u003ctd\u003eSKU\u003c\/td\u003e\n\u003ctd\u003eHAWKHB850C.655\u003c\/td\u003e\n\u003c\/tr\u003e\n \u003ctr\u003e\n\u003ctd\u003eUPC\u003c\/td\u003e\n\u003ctd\u003e840653082455\u003c\/td\u003e\n\u003c\/tr\u003e\n \u003ctr\u003e\n\u003ctd\u003eCompound\u003c\/td\u003e\n\u003ctd\u003eHPX (Code C)\u003c\/td\u003e\n\u003c\/tr\u003e\n \u003ctr\u003e\n\u003ctd\u003ePosition\u003c\/td\u003e\n\u003ctd\u003eRear\u003c\/td\u003e\n\u003c\/tr\u003e\n \u003ctr\u003e\n\u003ctd\u003ePad Thickness\u003c\/td\u003e\n\u003ctd\u003e0.655 in\u003c\/td\u003e\n\u003c\/tr\u003e\n \u003ctr\u003e\n\u003ctd\u003eOptimal Temp Range\u003c\/td\u003e\n\u003ctd\u003e100 to 600 degrees F\u003c\/td\u003e\n\u003c\/tr\u003e\n \u003ctr\u003e\n\u003ctd\u003eMax Operating Temp\u003c\/td\u003e\n\u003ctd\u003e700 degrees F\u003c\/td\u003e\n\u003c\/tr\u003e\n \u003ctr\u003e\n\u003ctd\u003eTorque Level\u003c\/td\u003e\n\u003ctd\u003eLow to Medium\u003c\/td\u003e\n\u003c\/tr\u003e\n \u003ctr\u003e\n\u003ctd\u003eStreet Legal\u003c\/td\u003e\n\u003ctd\u003eNo motorsports use only\u003c\/td\u003e\n\u003c\/tr\u003e\n \u003ctr\u003e\n\u003ctd\u003eShims Included\u003c\/td\u003e\n\u003ctd\u003eNo\u003c\/td\u003e\n\u003c\/tr\u003e\n \u003ctr\u003e\n\u003ctd\u003eRotor Compatibility\u003c\/td\u003e\n\u003ctd\u003eIron \/ steel rotors only not for PCCB\u003c\/td\u003e\n\u003c\/tr\u003e\n \u003ctr\u003e\n\u003ctd\u003eWarranty\u003c\/td\u003e\n\u003ctd\u003eLimited lifetime (Hawk Performance)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\n\u003ch4\u003eThis Part Fits\u003c\/h4\u003e\n\u003ctable\u003e\n \u003ctr\u003e\n\u003cth\u003eYear\u003c\/th\u003e\n\u003cth\u003eMake\u003c\/th\u003e\n\u003cth\u003eModel\u003c\/th\u003e\n\u003cth\u003eSubmodel \/ Notes\u003c\/th\u003e\n\u003c\/tr\u003e\n \u003ctr\u003e\n\u003ctd\u003e2014\u003c\/td\u003e\n\u003ctd\u003ePorsche\u003c\/td\u003e\n\u003ctd\u003e911\u003c\/td\u003e\n\u003ctd\u003eGT3 Rear\u003c\/td\u003e\n\u003c\/tr\u003e\n \u003ctr\u003e\n\u003ctd\u003e2015\u003c\/td\u003e\n\u003ctd\u003ePorsche\u003c\/td\u003e\n\u003ctd\u003e911\u003c\/td\u003e\n\u003ctd\u003eGT3 Rear\u003c\/td\u003e\n\u003c\/tr\u003e\n \u003ctr\u003e\n\u003ctd\u003e2016\u003c\/td\u003e\n\u003ctd\u003ePorsche\u003c\/td\u003e\n\u003ctd\u003e911\u003c\/td\u003e\n\u003ctd\u003eGT3 Rear\u003c\/td\u003e\n\u003c\/tr\u003e\n \u003ctr\u003e\n\u003ctd\u003e2017\u003c\/td\u003e\n\u003ctd\u003ePorsche\u003c\/td\u003e\n\u003ctd\u003e911\u003c\/td\u003e\n\u003ctd\u003eGT3 Rear\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\n\u003ch4\u003eFrequently Asked Questions\u003c\/h4\u003e\n\u003cp\u003e\u003cstrong\u003eWill HB850C.655 fit the 991.2 GT3 RS as well as the standard GT3?\u003c\/strong\u003e\u003cbr\u003eThe standard 991 GT3 RS uses a different rear caliper configuration with larger pistons. Verify the specific rear caliper specification before ordering; HB850C.655 is confirmed for the 2014-2017 GT3 non-RS fitment.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eCan these pads be used with Porsche's factory PCCB carbon ceramic rotors?\u003c\/strong\u003e\u003cbr\u003eNo. Hawk HPX pads are formulated for iron and steel rotors only. Using iron-compound pads on PCCB rotors will damage the ceramic surface and void rotor warranties.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eIs the HPX compound appropriate for track-day use where the car may also be street-driven to the event?\u003c\/strong\u003e\u003cbr\u003eNo. HPX is a pure motorsports compound that does not perform predictably at street-driving temperatures. For dual-use scenarios consider Hawk HP Plus.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat is the significance of the .655 thickness value in HB850C.655?\u003c\/strong\u003e\u003cbr\u003eThe numeric suffix represents the pad's overall friction material thickness in inches, 0.655 inches, encoded directly in the Hawk part numbering system.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eHow often should HB850C.655 pads be inspected during a race season?\u003c\/strong\u003e\u003cbr\u003eInspect pad thickness visually before every track session. Replace when pad material approaches the metal backing plate, as the HPX compound does not include audible wear indicators.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eDoes HB850C.655 require any caliper modifications for the 911 GT3?\u003c\/strong\u003e\u003cbr\u003eNo modifications are required. This pad is a direct replacement for the OEM rear friction material in the 2014-2017 Porsche 911 GT3 brake caliper.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat temperature monitoring is recommended with HPX pads?\u003c\/strong\u003e\u003cbr\u003eHawk recommends heat-sensitive paint strips or brake temperature monitoring to confirm the system reaches the 100 to 600 degree F optimal range during sessions and does not exceed 700 degrees F.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eAre there noise and dust considerations with HB850C.655 on street laps?\u003c\/strong\u003e\u003cbr\u003eRace compounds generate significant brake dust and noise at sub-optimal temperatures. This is normal. Do not use these pads on public roads.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eProposition 65 Warning:\u003c\/strong\u003e This product can expose you to chemicals including chromium, which is known to the State of California to cause cancer and birth defects or other reproductive harm. 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