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if i write twin piston then people might actually think they are good
Datsun 1200 disc brakes are good, as good as famous muscle car brakes, but are not up to current standards.
If you fit wide tires and load the 1200 down with extra weight (CA18 engine, heavy-duty differential, etc) you will neeed to go with larger brakes. The Datsun B210 disc brakes were designed for a car 20% heavier and fit the bill. The Datsun B310 brakes are even better. For racing go with a ventilated disc (so they won't fade as readily on repetitive braking). The 280ZX or R32 or other 'big car' brakes are called for.