A power piston in a power cylinder borehole of a hydraulic block of a hydraulic power unit of a hydraulic power vehicle braking system is only guided radially in an axially delimited guide section. The power cylinder borehole is configured with a larger diameter axially outside the guide section. A brake fluid channel extends through the guide section up to an opening of a brake fluid line.

A parking brake assembly for an electronically controllable pneumatic braking system for a vehicle includes a parking brake unit having a supply connection to receive a supply pressure, a brake request connection to receive a parking brake request, and a parking brake pressure connection to provide a parking brake pressure. The parking brake assembly further includes a first ABS valve unit for a first channel and a second ABS valve unit for a second channel. The first ABS valve unit is configured to provide a pressure for a first spring-loaded brake cylinder at the first channel and to admit air to the first channel, in stages. The second ABS valve unit is configured to provide a second brake pressure for at least one second spring-loaded brake cylinder at the second channel and to admit air to the second channel, in stages.

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.

The invention relates to a pedal travel simulator (100) for a motor vehicle brake, having a movably arranged simulator piston (1), an elastic element (2) that makes direct contact with the simulator piston, and a damping element (4). In a first portion (23a, 23b) of a simulator force-travel curve (200), a simulator piston force is provided by the elastic element (2). In a second portion (24a, 24b) of the simulator force-travel curve (200), the simulator piston force is provided by the elastic element (2) and the damping element (4) in parallel.

The invention also relates to a hydraulic block (300) comprising a pedal travel simulator (100).

The invention relates to a pedal travel simulator (100) for a motor vehicle brake, having a movably arranged simulator piston (1), an elastic element (2) that makes direct contact with the simulator piston, and a damping element (4). In a first portion (23a, 23b) of a simulator force-travel curve (200), a simulator piston force is provided by the elastic element (2). In a second portion (24a, 24b) of the simulator force-travel curve (200), the simulator piston force is provided by the elastic element (2) and the damping element (4) in parallel.

The invention also relates to a hydraulic block (300) comprising a pedal travel simulator (100).

A diaphragm arrangement (100) for a spring brake actuator (250) of a pneumatic braking system (210) of a vehicle (200a) enables a mechanical interaction between a piston pipe (255) of the spring brake actuator (250) and a push rod (260). The diaphragm arrangement (100) includes an outer diaphragm member (110), an inner diaphragm member (120), and a piston plate (130). The outer diaphragm member (110) is at least partially outwardly arranged from the inner diaphragm member (120) and the piston plate (130). The piston plate (130) deflects together with the pushrod (260). The outer diaphragm member (110) includes a central opening (111), and the inner diaphragm member (120) and/or the piston plate (130) are arranged to cover the opening (111). The outer diaphragm member (110), the inner diaphragm member (120), and the piston plate (130) are fixed to each other.

A divider arrangement (100) for a vehicle spring brake actuator (250) having a parking brake pressure chamber (251), a service brake non-pressure chamber (252), a service brake pressure chamber (256), and a diaphragm (253) to separate the service brake non-pressure chamber (252) from the service brake pressure chamber (256) includes an annular shaped divider (110) and a support member (120). The divider (110) is adapted to receive the diaphragm (253) and to divide the parking brake pressure chamber (251) and the service brake pressure chamber (256) from each other. The divider (110) is made of plastic and is lightweight, and the support member (120) mechanically and/or structurally supports the divider (110). The support member is metal and provides increased stiffness relative to the plastic divider. The divider is configured to be fixed to a cylinder of the spring brake actuator.

A pressure plate (100) for a brake actuator has a base section (102) and a peripheral radial wall (104) extending from the base section in a longitudinal direction (L). A peripheral rim (106) is arranged on a distal end (108) of the peripheral radial wall for connecting to a non-pressure plate of the brake actuator. An inlet port (110) is provided for receiving a pressurized fluid (CA). A central opening (112) is arranged on the base section and is configured to receive a pressure rod of a spring brake unit. A connection element (114) is configured to cooperate with both a respective cooperating connection element of a cover, configured to tightly close the central opening, and also with a respective cooperating connection element of a spring brake unit, such that the pressure rod of the spring brake unit is aligned with the central opening.

A spring brake actuator for a vehicle includes a spring brake housing defining a spring brake chamber, a service brake housing defining a service brake chamber, a push rod configured to extend from the service brake chamber to engage a wheel brake of the vehicle, and an actuator rod in the spring brake chamber and movable to extend into and retract from the service brake chamber. As the spring brake chamber is pressurized, air flows from the spring brake chamber through the actuator rod to the service brake chamber, and as the spring brake chamber is depressurized, air flows from the service brake chamber through the actuator rod to the spring brake chamber.

A locking device configured to manually release a parking brake in a brake actuator for rail vehicles, the locking device including a spindle drive including a teething; a locking element engaging the teething of the spindle drive and switching a rotating movement and thus an axial force transmission of a parking brake on or off; and at least one contact damping element configured to dampen or prevent a contact of the locking element.