Abstract: In order to reapply the fluid operating pressure to the braking members of the wheels after an anti-locking operation has been carried out, a pumping device is provided which are driven by the subatmospheric pressure (vacuum) existing in the inlet manifold of the engine. The application of the braking pressure is controlled by a valve which receives an opening command signal consisting of a train of pulses from a control device. At least one vacuum sensor is provided which generates a monitoring signal indicative of the level of vacuum present in the inlet manifold. The control device causes opening of the valve with a command signal whose average is inversely proportional to the level of the monitoring signal generated by the vacuum sensor.

Abstract: An electronic ignition system, for a four-stroke, four-cylinder engine, having:sensors that provide signals indicative of the running conditions of the engine,two ignition transformers, each having their respective output windings connected to the spark plugs of a respective pair of cylinders of the engine,means for monitoring the current flow in the respective input windings of the two transformers,switching means for selectively and alternately connecting output of a single integrated circuit to the input windings of the two transformers, and a micro-processor unit. The switching means has two electronically controlled switch devices, respectively in series with the input winding of the first and of the second ignition transformer, connected together in a current path in parallel.