Are your brake lights staying on?  It  may be that you need a new genuine Nissan brake light switch stopper.

Clear suits most of the early model Datsun's such as 1200, 120Y, 1600, 180B, 200B, Bluebird, Stanza and Sunny.  Green suits later model Nissan's such as R31 Skyline, R32 Skyline, S13, Z32 300ZX