Topic: Optimal brake pad pairing for Cast Iron Brake Rotors & AP Racing CP2696 / CP2195 Calipers using SBS 523HF ceramic/resin pads. Details: Happy Saturday night from the decoboco tech bay! Continuing our GS1000S optimization series, today’s log focuses on brake friction pairing. Pairing aggressive sintered metal pads with vintage cast-iron discs is a severe mistake—hard metal particles rapidly chew up the softer iron surface, causing grooved rotor wear and unbearable squealing. The perfect match is the SBS 523HF (Ceramic/Resin) compound. Verdict: It offers exceptionally low rotor wear, virtually zero brake squeal, and unlocks the signature, progressive “velvety” bite that makes classic cast-iron braking legendary. Matching pad compound to rotor metallurgy is the ultimate mechanical calibration!