A brake system for a trailer has first and second pneumatic circuits for supplying air pressure to the wheel ends on the trailer. The air pressure to brake devices at the wheel ends is controllable via a first brake ECU. First and second pressure control valves control pressure from the pneumatic circuits to the respective wheel ends. The system further has a second ECU adapted to electrically control the actuation of the pressure control valves.

A parking brake device for motor vehicles has at least one first parking brake unit and one second parking brake unit, wherein the first parking brake unit has at least one first compressed air connector, a first inlet-ventilation solenoid valve unit, a first relay valve, a spring brake valve and at least one first compressed air outlet. The first compressed air connector is connected to the first inlet-ventilation solenoid valve unit and the first relay valve. A first control line is provided in the first parking brake unit in such a way that the first relay valve is connected to the first inlet-ventilation solenoid valve unit, wherein the first control line has a first branch upstream of the first relay valve, and wherein a first outlet line is provided in the first parking brake unit, which first outlet line is connected to the at least one first compressed air outlet and has a first outlet branch. A spring brake line is provided in the first parking brake unit, which spring brake line is connected via a first branch to the first control line and via the first outlet branch to the outlet line. The first parking brake unit has a spring brake valve which is arranged in the spring brake line and is connected to the first relay valve, and a first throttle unit which is arranged in the spring brake line between the first outlet branch of the first outlet line and the first branch of the first control line.

A brake system in a vehicle includes a brake circuit arranged to contain pressurized brake fluid; a parking brake acting on at least one wheel of the vehicle, the parking brake connected to the brake circuit and configured to be engaged when the pressure in the brake circuit is below a threshold pressure; and at least two evacuation valves, each configured to evacuate pressurized brake fluid from the brake circuit in response to a control signal, for thereby engaging the parking brake.

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 electronically controlled pneumatic brake system (2) for a vehicle 100, with a supply coupling head (24), a control coupling head (26), and an electronically controlled trailer control module (28) includes a first supply port (28.1), a trailer supply connection (28.2) for providing a trailer supply pressure (pT) to the supply coupling head (24), a trailer control connection (28.3) for providing a trailer control pressure (pB) to the control coupling head (26), an electro-pneumatic trailer control valve arrangement (40) for providing the trailer control pressure (pB), and a tractor protection valve electronic control unit (42). The electro-pneumatic trailer control valve arrangement (40) is configured to only supply a trailer control pressure (pB) to the trailer control connection (28.3) when compressed air is supplied to the trailer supply connection (28.2).

A brake system for a transportation vehicle having a brake device for braking a wheel of the transportation vehicle, an actuator device for targetedly actuating the brake device, a control device for controlling the actuator device, and an emergency brake device for braking the wheel in response to a malfunction of the transportation vehicle. The emergency brake device has an energy store for storing energy for actuating the brake device and a triggering device for releasing the stored energy in the energy store to actuate the brake device, the triggering device releases the energy store in response to a failure of an on-board electrical system of the transportation vehicle. Also disclosed is a method for operating a brake system and to a transportation vehicle having such a brake system.

An air parking brake electric control valve includes an air valve unit and a self-lock unit. The air valve unit includes a main valve body, an auxiliary valve body, a valve core and a first electromagnetic assembly. The valve core is driven by the first electromagnetic assembly to move between a first action position and a second action position. The self-lock unit is disposed on the auxiliary valve body, and includes a second electromagnetic assembly. The second electromagnetic assembly includes a movable column operable to move between a release position and a lock position.

A disc brake apparatus structured such that, on receiving a pressing force from an operating spring, a piston arranged within a cylinder formed in a caliper body presses a piston side pad. The disc brake apparatus includes a support part formed in a part of the caliper body, a reaction force receiver provided on and projected from the lateral side of the piston and opposed to the support part, and cam parts interposed between the support part and the reaction force receiver and, on receiving a rotation force, capable of spreading the distance between the support part and the reaction force receiver to thereby release the pressing force.

Disclosed is a brake system for a railway vehicle, including linings each having at least one positioning member for mechanically fastening the linings in a predetermined position on the system with respect to a disc of the vehicle and a bearing face for tightly gripping the disc under the action of an actuator of the system, and at least one return member for separating the linings from the disc in order to release it when the linings are freed from the action of the actuator; each lining has at least one fastening member formed on an edge, the return member has two opposite end lugs connected to one another by an elastic portion and each mechanically fastened with a the fastening member, and the system is configured such that the fastening members and the end lugs are situated at a distance from the at least one positioning member.