Vehicle braking system and braking method

A vehicle braking system comprising:

• first brakes with at least one lining or at least one block, the at least one lining or the at least one block comprising a body;
• a braking linkage configured to act on at least one of the first brakes;
• a service brake comprising a braking piston movable relative to the body of the first brakes to act on the braking linkage and delimiting with the body of the first brakes;
• a service brake pressure chamber configured to be supplied by a first pneumatic pressure agent to place the braking piston in a service braking position;
• a parking brake configured to act on the braking piston of the service brake and having a working configuration and a resting configurations,
• the parking brake comprising a blocking device movable relative to the body to act on the braking piston and having a first position and a second position in which the blocking device is configured to immobilize the braking piston in the service braking position, with the parking brake in the working configuration;
• a control device movable relative to the body of the first brakes and delimiting with the body of the first brakes;
• a parking brake pressure chamber configured to be supplied by a second pneumatic pressure agent, the parking brake pressure chamber having a locking position in which the control device is configured to hold the blocking device in the second position;
• a dedicated first pneumatic distribution device formed by a first distributor provided with a first movable slide having two positions and having a single inlet aperture connected to a source of supply of pneumatic pressure agents, the first distributor also including a single outlet aperture connected to the parking brake pressure chamber to supply the parking brake pressure chamber with the second pneumatic pressure agent and place the parking brake in the resting configuration or vent the second pneumatic pressure agent to place the parking brake the working configuration, the first distributor also including an aperture opening into atmosphere;
• and
• a dedicated second pneumatic distribution device formed by at least one second distributor provided with a second movable slide having two positions, the second pneumatic distribution device having a single inlet aperture connected to the source of supply of the pneumatic pressure agents and a single outlet aperture connected to the service brake pressure chamber supply the service brake pressure chamber with a third pneumatic pressure agent of which a pressure value is determined to apply a determined braking force while the parking brake is in the working configuration, the second pneumatic distribution device including an aperture opening into the atmosphere,
• wherein the control device is configured to control the first and second pneumatic distribution devices, the control device including a control line that is linked to each of the first and second pneumatic distribution devices and is configured to convey at least one application setting of the parking brake, the control line directly linked only to the second pneumatic distribution device, wherein the control device also includes a transmission line linking the single outlet aperture of the second distributor of the second pneumatic distribution device to the first pneumatic distribution device and a pressure switch interposed on the transmission line.