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I'd try asking the dealership, they would know if the part number is the same for both sc3 and 4. personally I'd assume they would not change since it's a drum style e-brake it's just the outer diameter that is larger between 300/400 and supra but don't know for sure
Thanks rcchris7, I never thought of that at all. That would explain why the sc400 rotor/caliper is better, same drum diameter, larger rotor diameter, meaning larger break surface for the pads...hmmm...