Acura NSX 1991 Manual page 522

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Modulator Unit
Modulators and solenoid valves for each wheel are integrated in the modulator unit.
The modulators for front and rear brakes are of independent construction.
The solenoid valve features quick response (5 ms or less).
The inlet and outlet valves are integrated in the solenoid valve unit.
Accumulator
The accumulator is a pneumatic type which accumulates high-pressure brake fluid fed from the pump incorporated in the
power unit. When the anti-lock brake system operates, the accumulator feeds high-pressure brake fluid to the modulator
valve via the inlet side of the solenoid valve.
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