A method for emergency engagement of a holding brake of a vehicle having an electropneumatic brake system. The electropneumatic brake system includes a service brake system with a service brake and a holding brake system with the holding brake. The holding brake system has spring brake cylinders. The service brake system includes a service brake control unit. The electropneumatic braking system includes at least one brake circuit for the service brake and the holding brake. The service and holding brakes may be in separate brake circuits. The spring brake cylinders can be vented when a supply pressure in at least one brake circuit for the service brake decreases. The method includes reducing, via the service brake control unit, the supply pressure in at least one brake circuit for the service brake under a program control in defined conditions.

A method for emergency engagement of a holding brake of a vehicle having an electropneumatic brake system. The electropneumatic brake system includes a service brake system with a service brake and a holding brake system with the holding brake. The holding brake system has spring brake cylinders. The service brake system includes a service brake control unit. The electropneumatic braking system includes at least one brake circuit for the service brake and the holding brake. The service and holding brakes may be in separate brake circuits. The spring brake cylinders can be vented when a supply pressure in at least one brake circuit for the service brake decreases. The method includes reducing, via the service brake control unit, the supply pressure in at least one brake circuit for the service brake under a program control in defined conditions.

A spring brake actuator for a commercial vehicle includes a service brake portion (4) and a spring brake portion (6) that has a housing (8, 108) with a first end (10, 110) proximal to the service brake portion (4), a wall section (12, 112) extending from the first end (10, 110), a second end (14, 114) distal to the service brake portion (4), and a locking mechanism (16, 116) for locking the first and second ends (10, 110, 14, 114) to the wall section (12, 112). The locking mechanism (16, 116) is arranged between the wall section (12, 112) and the second end (14, 114) of the housing (8, 108).

A spring brake actuator for a commercial vehicle includes a service brake portion (4) and a spring brake portion (6) that has a housing (8, 108) with a first end (10, 110) proximal to the service brake portion (4), a wall section (12, 112) extending from the first end (10, 110), a second end (14, 114) distal to the service brake portion (4), and a locking mechanism (16, 116) for locking the first and second ends (10, 110, 14, 114) to the wall section (12, 112). The locking mechanism (16, 116) is arranged between the wall section (12, 112) and the second end (14, 114) of the housing (8, 108).

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 system for electrically controlling air brakes on a trailer having an electrically actuated valve for releasing pressurized air at a controlled rate. The trailer is connectable to a standard electrical connector on a towing vehicle that provides a proportional braking signal. The proportional signal is sent to a controller that actuates the electrically actuated valve. When the controller receives the proportional braking signal from the towing vehicle representing no braking force, the controller actuates the electrically actuated valve to produce no air pressure to the air brake. When the controller receives the proportional braking signal from the towing vehicle representing full braking force, the controller actuates the electrically actuated valve to provide air to the air brake corresponding to full braking force of the air brakes.

A method operates a braking device for motor vehicles, in particular for utility vehicles. Along a trailer supply line for supplying air to a parking brake of a trailer and/or a trailer control line for supplying air to an operating brake of a trailer, the air pressure is measured by at least one pressure transducer and is transmitted in the form of an electric signal to an electronic control unit of the motor vehicle. In the event of a faulty pressure change response, an open trailer supply line and/or an open trailer control line is detected.

An emergency brake device for a rail vehicle includes a compressed-air-brake system, wherein a braking process can be initiated by lowering the air pressure in a main air conduit and which includes an exclusively electric connection to a passenger emergency brake.

The disclosure relates to a method for operating an electropneumatic parking brake module for an electronically controllable pneumatic brake system for a vehicle, in particular a commercial vehicle, having a supply port for receiving a supply pressure, at least one parking brake port for the connection of at least one parking brake cylinder, a main valve assembly which receives the supply pressure and is configured to output a spring brake pressure at the parking brake port in dependence on a control pressure, and a pilot valve assembly which receives the supply pressure and is to provide the control pressure, wherein the pilot valve assembly has a bistable valve which can be switched between a first air admission position and a second air release position, and a control unit for providing first and second switch signals to the pilot valve assembly.

A parking brake device with at least one first connector line to a compressed air source and with at least one second connector line to a compressed air source, includes at least one electronically actuable bistable valve arrangement for the actuation of a spring brake cylinder and at least one further electronically actuable redundancy control valve arrangement for the actuation of a redundant brake system. At least one first control electronics module and at least one second control electronics module are provided which can be operated independently of one another. The bistable valve arrangement can be actuated via the first control electronics module, and, independently thereof, the redundancy control valve arrangement can be actuated via the second control electronics module.