Described herein is a gas-liquid separating gas exchange device comprising a vent mechanism that services gas exchange between the interior and exterior of a housing, a shelter of the vent mechanism distal from the housing that provides shelter of a distal area around the vent mechanism, an area-encompassing abutment rising distally from the housing and encompassing both the vent mechanism and the shelter and creating a fluid-catchment junction between the shelter and the abutment, and at least one fluid-exchange passageway in the at least one shelter allowing fluid exchange between the distal sheltered area and the abutment into the fluid-catchment junction. The gas-liquid separating gas exchange device may separate gas and liquid by gravity, energy of vibration, air-pressure forces, or a combination thereof and facilitates expulsion of contaminating liquid and debris from the housing.

An electropneumatic parking brake system for a utility vehicle includes a pilot module configured to control at least a first control pressure. The pilot module has a pilot store connection configured to receive a store pressure from a compressed air device and at least one pilot valve combination. The electropneumatic parking brake system further includes at least one manually actuatable piston valve connected to a valve store connection and having a parking brake connection. The parking brake connection is ventilated in a first switching position of the piston valve and a parking brake pressure at the parking brake connection is controllable in a second switching position of the piston valve. The piston valve has a first pneumatic control connection at which the first control pressure is configured to be controlled in order to pneumatically switch the piston valve.

A brake system includes a first electric power-supply-unit (EPSU) and a first electronic-brake-control-unit (EBCU). The first EBCU is connected to the first EPSU. Also, the brake system includes a second EPSU and a second EBCU, which is connected to the second EPSU. The brake system further includes a first axle-pressure-modulator (APM) for service-brake-chambers associated with a first vehicle-axle. The brake system includes a second APM for spring-brake-cylinders for a second vehicle-axle. The brake system includes two power-supply-switches (PSS). A first PSS is connected to the first EBCU, the second EBCU and the first APM and configured to connect the first EBCU or the second EBCU to the first APM. A second PSS is connected to the first EBCU, the second EBCU and the second APM and configured to connect the first EBCU or the second EBCU to the second APM.

A pneumatic braking device for a utility vehicle includes at least one pneumatically controllable spring accumulator for a parking brake of the utility vehicle and an electronic parking brake device. The electronic parking brake device has at least one electronic control unit, at least one bistable valve unit, at least one first valve unit by which a parking brake of a trailer of the utility vehicle can be deactivated when activating the parking brake of the utility vehicle, at least one second valve device which can be connected in such a way that when there is a decrease in the system pressure for supplying the parking brake of the trailer, the parking brake of the trailer can be activated, and a traction vehicle protection valve.

A vehicle braking system comprising a spring brake actuator having a spring brake chamber, a spring brake control assembly and an immobiliser valve which is movable between brake release position in which the spring brake control assembly is operable to cause the flow of pressurised fluid into the spring brake chamber or to vent the spring brake chamber to a low pressure region, and an immobilise position in which the spring brake control assembly is operable to connect the spring brake chamber to a low pressure region but cannot be operated to cause the flow of pressurised fluid into the spring brake chamber.

A vehicle braking system comprising a spring brake actuator having a spring brake chamber, a spring brake control assembly and an immobiliser valve which is movable between brake release position in which the spring brake control assembly is operable to cause the flow of pressurised fluid into the spring brake chamber or to vent the spring brake chamber to a low pressure region, and an immobilise position in which the spring brake control assembly is operable to connect the spring brake chamber to a low pressure region but cannot be operated to cause the flow of pressurised fluid into the spring brake chamber.

An electro-pneumatic parking brake arrangement includes a shut-off valve and a parking brake module. The parking brake module includes a reservoir connection configured to connect to a compressed air reservoir, a first spring-loaded accumulator connection configured to connect to the shut-off valve, an electro-pneumatic valve unit having at least one electro-pneumatic valve configured to output a spring-loaded brake pressure at the first spring-loaded accumulator connection, and an electronic control unit configured to receive parking brake signals from an electronic parking brake switch and/or a higher-order control unit. The shut-off valve comprises a second spring accumulator connection configured to connect the spring-loaded brakes of the further axle and to shut off the second spring accumulator connection depending on a shut-off signal provided by the parking brake module.

A control valve for applying a spring-loaded brake pressure to spring-loaded parts of a rear-axle wheel brake is pneumatically activated as a function of a parking-brake braking demand and a service-brake braking demand. A first control chamber is connected via a first control piston to a control arrangement in the control valve. During an adjustment of the first control chamber via the service-brake control pressure, the spring-loaded brake pressure at the working output is a function of the service-brake control pressure or of the parking-brake control pressure. The first control piston is connected to a third control chamber, wherein the pressure in the first control chamber acts on the first control piston in one direction, and the pressure in the third control chamber acts on the first control piston in the opposite direction. The first control chamber is selectively connectable to the third control chamber via a switchable bypass valve.

A pneumatic braking device for a utility vehicle includes at least one pneumatically controllable spring accumulator for a parking brake of the utility vehicle and an electronic parking brake device. The electronic parking brake device has at least one electronic control unit, at least one bistable valve unit, at least one first valve unit by which a parking brake of a trailer of the utility vehicle can be deactivated when activating the parking brake of the utility vehicle, at least one second valve device which can be connected in such a way that when there is a decrease in the system pressure for supplying the parking brake of the trailer, the parking brake of the trailer can be activated, and a traction vehicle protection valve.

A control valve (12) for applying a spring-loaded brake pressure (p3b) to spring-loaded parts of a rear-axle wheel brake is provided. The control valve (12) is activatable pneumatically via a second control input (12b) with a parking-brake control pressure (p5). The parking-brake control pressure (p5) can act in such a manner on a control mechanism (14b, 15b, 17c, 22, 23, 24) arranged in a valve housing (12f) of the control valve (12) that a spring-loaded brake pressure (p3b) arises at a control output (12c) of the control valve (12) as a function of the parking-brake control pressure (p5) for bringing about a parking-brake braking specification with the spring-loaded parts of the rear-axle wheel brakes. The control valve (12) has a first control connection (12a) connectable to an adjustable first control chamber (14a), which is operatively connected to the control mechanism (14b, 15b, 17c, 22, 23, 24).