Braking device for self-propelled roller

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A secondary braking device for a self-propelled diesel-driven roller (1) is especially for a vibrating roller that is operated on steep downgrades only on rare occasion. The roller (1) is equipped with an electronic engine control module (2) that is programmed so as to, when a preset primary diesel engine speed is exceeded, connect to ground an actuator relay (4) for a hydraulic valve (5) in the hydraulic system (6) of the roller. The hydraulic valve is thereby caused to interrupt the hydraulic supply pressure to one or a plurality of drum brakes (8). The drum brakes (8) generate maximum braking force upon the loss of supply pressure.