(57) Two hydraulically controlled brakes (32) are attached to an elevator car (10) and
each engages a guide rail (18). Each brake (32) is applied by a spring (40). The spring
is compressed to release the brake, by actuating hydraulic cylinders (31a) through
an electromechanically operated master cylinder (31) that responds to a signal from
the motor control (16). An electromechanical release valve (52) is operated by a govenor
(22), when an overspeed condition exists to quickly release the pressure in the cylinders,
applying the brake.
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