| 摘要 |
PURPOSE: A brake of a vehicle is provided to reduce the oil pressure of a brake in a low-speed travel, to reduce the wear speed of a brake lining, and to minimize the loss of the braking power by variably controlling the amount of the oil supplied to an air master from an oil reservoir. CONSTITUTION: An oil supply unit consists of an oil reservoir(5) connected with an air master(6) via an oil path(5a), an ECU(Electronic Control Unit)(30) to decide a vehicle speed transmitted from a wheel speed sensor(20), and a flow rate control unit(40) installed on the oil path to variably control the sectional area of the oil path. If a brake pedal is stepped on, the ECU operates the flow rate control unit. At a low speed, the ECU applies a small variable resistance value to a coil of the flow rate control unit. A rotating bar rotates in a small angle to open the oil path. If a vehicle speed is high, the oil path is opened in a large angle.
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