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1972 USA Owners manual (Page 25 ... ):
Before driving or whenever you call at a gas-station, be sure to check ...
- Leakage and amount of fluid in brake and clutch master cylinders
- Clutch and brake operation
Observe the level of fluid visible through the plastic reservoir of the master cylinder (no need to remove the cap).
- If it is at or below the fill line, top up with DOT 3 Brake/Clutch fluid.