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Nitrogen Accumulator

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If you happen to be steering at the same time as braking or the engine shuts down then the hydroboost has a nitrogen-charged accumulator that acts as a back-up pressure source. The early accumulators (right) used a massive spring to make pressure, but eventually it was discovered that a nitrogen-charged chamber with a floating piston similar to that used in a shock would be sufficient. The charge is good for one or two full power-brake applications without pump pressure, and after that there is still manual braking.