Pneumatic brake servomotor comprises low pressure and variable pressure chambers and three-way valve activated by brake pedal rod, during braking variable pressure chamber communicates with high pressure

摘要

The servomotor comprises a low pressure chamber (9), a variable pressure chamber (11) and a three-way valve (38) activated by rod (18) controlled by a brake pedal and putting, at rest, the two chambers. During braking the variable pressure chamber is put into communication with a high pressure environment. The servomotor comprises a sleeve (39) allowing the pressure height to be modified in the event of emergency braking.