A method for operating a vehicle brake, wherein the vehicle brake comprises a service brake having an actuating piston, which can be moved into an actuation position in order to produce a braking force by the action of a hydraulic pressure, and wherein the vehicle brake also comprises a parking brake unit, which is designed to move over a first motion range without producing a braking force and is also designed to move over a second motion range, in which the parking brake unit is supported against the actuating piston and a braking force is thus changed, wherein the first and second motion ranges transition into each other at a support point, wherein the method is performed in the pressureless state or at a hydraulic pressure below a predefined threshold value and comprises the following steps: a) moving the parking brake unit from the first into the second motion range or vice versa; b) recording the curve of an operating parameter of the parking brake unit during step a); and c) determining the position of the support point on the basis of the curve of the operating parameter.

An electropneumatic brake control module (1) for utility vehicles (100) includes a supply port (2) for connecting a compressed air supply (3); a first axle channel port (4); a pneumatically controlled inlet/outlet valve unit (10) for outputting a first braking pressure (PB1) at the first axle channel port (4); and an electropneumatic pilot control unit (8) for outputting at least one first control pressure (P1) at the inlet/outlet valve unit (10). The brake control module (1) further includes a redundancy pressure port (6) for receiving a redundancy pressure (PR) and a redundancy valve unit (12) connected to the redundancy pressure port (6) for outputting a redundancy braking pressure (PBR) at the first axle channel port (4) in the event that the electropneumatic pilot control unit (8) has a fault.

A brake module for a hydraulically braked tractor coupled to a pneumatically braked trailer has a trailer control valve connected via hydraulic control inlet to a hydraulic pressure line leaving a master brake cylinder, and via pneumatic inlet to a compressed air reservoir. Hydraulic control pressure determines pneumatic output pressure level at a trailer control valve pneumatic outlet. The brake module has a break-off prevention module which, if the control line leaks or separates from the trailer control valve relative to the trailer brake system, closes a supply pressure coupling head supply line and causes trailer brake system venting. The break-off prevention module has a pneumatic supply pressure inlet and a pneumatic tear-off control pressure inlet connected to the air reservoir independently of trailer control valve pressure inlets. Supply pressure inlet supply pressure passes through the break-off prevention module and feeds to a trailer control valve pneumatic supply pressure inlet.

There is disclosed a motorcycle parking brake device adapted to be mounted to the master cylinder of a braking system. The brake device includes a bolt portion with a stem portion which extends to a head having a flange. The stem portion includes a threaded portion, a cylindrical first seat, a recessed portion, and a second seat. The stem portion has a stem channel with an O-ring slot containing an O-ring seal. A hydraulic fluid opening extends through the recessed portion and into the stem channel. The central stem channel extends to a head channel. A plunger is coupled to the bolt portion for reciprocal movement between a disengaged position and an engaged position. The plunger has a shank, a piston, and a push plate. The brake device also has a seal fitted about the second seat and a resilient D-ring seal fitted about the first seat.

Systems and methods for braking a vehicle. The method includes receiving, with an electronic controller, a signal from a mode activation mechanism indicating the vehicle is in a first mode and receiving, with the electronic controller, a signal from an input mechanism. If the vehicle is in the first mode and an operator of the vehicle actuates the input mechanism, the electronic controller sends a signal to a brake of the vehicle to lock up a wheel of the vehicle.

A system on a tractor for controlling trailer service brakes comprises a manually operated trailer brake switch, a first electropneumatic valve in communication with a pressure source and a controller. The controller has an input communicating with the trailer brake switch, an output communicating with the electropneumatic valve and control logic. The control logic receives an input from the trailer brake switch indicating a driver's request to apply the trailer service brakes of the combination vehicle, determines if a predetermined condition exists and transmits a signal to the output to the electropneumatic valve. The electropneumatic valve transmits pressure to a trailer service control line to actuate the trailer service brakes in response to the trailer brake switch and existence of the predetermined condition.

A controller on a tractor portion of an articulated vehicle includes an electrical input port adapted to receive an electrical input signal based on a command to unpark a trailer portion of the articulated vehicle and an electronic processor adapted to: receive the electrical input signal from the electrical input port; identify, based on the electrical input signal, when the command to unpark the trailer is received at the electrical input port; and based on the command to unpark the trailer, transmit an electrical output signal to an electrical output port for causing supplemental compressed air to be communicated from the tractor to the trailer for filling an air tank on the trailer using a quick-fill mode.

A power split hybrid powertrain includes an electrically actuated brake that selectively engages a ring gear attached to a flywheel. The ring gear may be, for example, a starter ring gear. Engagement of the brake while the engine is stopped permits use of both electric machines to provide torque to vehicle wheels, thereby increasing the electric torque capacity of the powertrain. The brake is mounted for movement relative to the ring gear, and a mechanical linkage is attached to the brake. In the event of a malfunction of the brake that prevents normal operation of the powertrain, the linkage is manually actuatable by a vehicle operator to move the brake to an override position wherein it cannot engage the ring gear.

A braking system for a vehicle, which includes a control system configured to: actuate a pressure generation device in accordance with a braking request signal to generate the brake pressure; ascertain an operational state of the pressure generation device; ascertain a position of a displacement piston of a brake master cylinder based on the braking request signal; and couple a pressure modulation device to a brake master cylinder volume and actuate the device so that the pressure modulation device conveys brake fluid out of the brake master cylinder volume into the wheel brake circuit, if the operational status of the pressure generation device is ascertained to be nonoperational and the displacement piston is in the idle position.

An electro-hydraulic brake system comprises a master cylinder block in fluid communication with a reservoir tank containing a brake fluid. The master cylinder block defines a bore and primary and secondary openings. A protrusion extends outwardly from a rear surface of the master cylinder block. A pressure supply unit coupled to a front surface of the master cylinder block and in fluid communication with the reservoir tank for supplying the brake fluid from the reservoir tank. A master cylinder electronic control unit couples to the rear surface and in an abutment relationship with the protrusion. At least one isolation valve disposed on the rear surface, spaced apart from the protrusion and received by the master cylinder electronic control unit, for regulating brake fluid flow from the master cylinder block to the wheel brakes.