A PNEUMATIC BRAKING SYSTEM FOR AN AXLE OF A VEHICLE

The invention relates to a pneumatic braking system (100) comprising: a. a service brake actuator (1), b. an electro-pneumatic modulator unit (2) for: i. Receiving an air control pressure (P1) representative of a driver's braking request, ii. Delivering by a regulation unit (40) a modulated air pressure (P_s) to a service brake chamber (3), c. a parking brake actuator (4), d. a parking brake unit (7), for delivering a second air pressure (P_p) to a parking brake pneumatic chamber (6), e. an isolation device (8) for: i. when the isolation device (8) is electrically energized, preventing the delivery of the air control pressure (P1) to the regulation unit (40), and ii. when the isolation device (8) is not electrically energized: 1. allowing the delivery of air control pressure (P1) to the regulation unit (40) when the second air pressure (P_p) is higher than a threshold (Th_1), and 2. preventing the delivery of air control pressure (P1) to the regulation unit (40) when the second air pressure (P_p) is lower than the threshold (Th_1).