Operating unit for electro-hydraulic braking system of ''brake by wire'' type motor vehicle, with 1st and 2nd pistons preloaded respectively by 1st and 2nd return springs operated by pedal and arranged one behind other in housing, etc.

摘要

The operating unit includes a tandem cylinder with first and second pistons (2,3) and a facility is provided for monitoring the function of a third valve unit (11,14). Means are provided, which with each operating of the operating unit, the closing element (11) of the third valve unit (11,14) is acted on with the pressure controlled in the first pressure chamber (4,40).