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The truck is 1980 and has dual air circuits driving a servo to dual hydraulic circuits. The handbrake is a spring brake on the rear axle that operates the wheel hydraulic cylinders mechanically.
The difference between the two air circuits is that when one fails the handbrake will lose pressure and the brakes will apply whereas when the other fails nothing much will happen apart from the buzzer in the cab. I can't quite get my head around the logic of having the handbrake apply when one system fails but not the other.
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