Abstract: The invention relates to a brake having a brake shoe (16), an actuating element for pressing the brake shoe (16) against a brake disc (18), and at least one lever (26) disposed such that it increases a braking force applied by the brake shoe (16) to the brake disc (18) by deflecting a tangential force acting on the brake shoe (16) during braking. The actuating element comprises at least one brake disc side part (24), an actuator side part (20), and a coupling part disposed between the brake disc side part and the actuator side part, wherein the coupling part (22) can be pivoted relative to the brake disc side part (24) and/or the actuator side part (20).

Abstract: The invention relates to a pneumatically operated brake system (30) for a vehicle. Said brake system (30) has a first compressed air line (4), in which compressed air having a controllable service brake pressure can be provided. Membrane parts (6) of brake cylinders (8) can be ventilated by means of said service brake pressure for a service brake function of said vehicle. Said brake system (30) further has a parking brake device (76) comprising a second compressed air line (12). Compressed air can be provided-in said second compressed air line (12) by means of said parking brake device (76) at a parking brake pressure that can be activated in an electro-pneumatic manner. Spring brake parts (22) of the brake cylinders (8) can be ventilated by compressed air having said service brake pressure in order to provide a parking brake function of said vehicle.

Abstract: The invention relates to a parking brake of a brake system for a vehicle, wherein a anti-lock device (5) of the parking brake is present, which based on a signal that is dependent on a rotational speed of an engine, a transmission, or a drive shaft present in the vehicle prevents blocking or excess slippage of a wheel that can be decelerated by the parking brake. The invention further relates to a brake system of a vehicle having the parking brake and to a method for operating the brake system and to a method for operating the parking brake.

Abstract: The invention relates to a braking system (16) for a vehicle (10), particularly a commercial vehicle, having an operating brake device for providing an operating brake function for braking the vehicle, and a parking brake device (92) for providing a parking brake function independently of the operating brake system. In order to improve the functionality of the braking system in case of a fault, the vehicle can be braked automatically by means of the other braking device if one of the two braking devices partially or completely fails. The invention further relates to a brake pedal device for such a braking system.

Abstract: The invention rotates to a modulator (1), particularly for a brake system in a motor vehicle, connected to a central module (15) via a data bus (20), the modulator (1) having at least one input (6) for capturing measured values and at least one output (8) for controlling at least one electromagnetic valve, a control circuit for actuating the at least one electromagnetic valve being connected by the data bus (20) such that the measured values captured by the modulator (1) are transmitted to the central module (15), control commands for actuating the at least one electromagnetic valve being first calculated from said measured values in the central module (15), said control commands being transmitted via the data bus (20) to the modulator (1) in order that the modulator (1) selects the at least-one electromagnetic valve as a function of the control commands transmitted via the data bus (20).

Abstract: The invention relates to a method for operating a brake device of a motor vehicle, comprising a service brake (16) and a parking brake (14). Upon activation of a rolling brake function (S1), and achieving a full stop of the vehicle, monitoring (S2) of an actuating element occurs with regard as to whether a driver has contact with an actuating element. In order to improve the safety of the rolling brake function, the invention provides that, if the monitoring (S2) finds that the driver has no contact with the actuating element, the parking brake (14) is applied (S3), or a braking pressure (14) is controlled using the service brake (16), the braking pressure corresponding to the maximum braking pressure (S10) that can be generated by the parking brake (14), by means of an electric or electronic brake device (26) for controlling the service brake (16) and the parking brake (14).

Abstract: The invention relates to a valve unit (14) for an electro-pneumatic brake control device (10) for controlling a parking brake of a vehicle, wherein the valve unit (14) has at least one air-quantity-boosting valve device (64) for aerating and deaerating at least one spring brake cylinder (12) of the parking brake and at least one electrically actuable, control valve (86) for controlling the air-quantity-boosting valve device (64). In order to simplify the construction of the brake control device, the air-quantity-boosting valve device (64) and the control valve (86) are integrated in a common integral valve block (112).

Abstract: An electro-pneumatic brake control device is provided for controlling a parking brake of a vehicle having a service brake and a parking brake, the service brake having a brake pedal and pneumatically actuatable brake cylinders operatively connected to the brake pedal for actuating wheel brakes. At least one brake cylinder is a spring brake cylinder with a spring store part for actuating the parking brake. In the event of a failure of the electrical energy supply, the spring store part of the spring brake cylinder is permanently vented by actuating the brake pedal in order to activate the parking brake.

Abstract: The invention relates to a pneumatic brake system 72 for a vehicle with brake cylinders 82, 84, which can be actuated with compressed air, for actuating wheel brakes, wherein a first group of wheel brakes belongs to a first brake circuit with a first compressed air storage tank 116 for providing a first stored pressure, and a second group of wheel brakes belongs to a second brake circuit with a second compressed air storage tank 130 for providing a second stored pressure, wherein at least one brake cylinder of the first brake circuit is embodied as a combined spring-store/diaphragm cylinder 84 with a spring store part 86 for providing a parking brake and a diaphragm part 88 for providing a service brake. In the event of a failure of the first brake circuit, the spring store part 86 can be deaerated in order to engage the parking brake.

Abstract: The invention relates to a brake system (10) for a vehicle having a parking brake with an air-quantity-boosting valve device (34) for aerating and deaerating at least one spring brake cyclinder (14) of the parking brake, having at least one electrically actuable control valve (52) for controlling the air-quantity-boosting valve device (34), having an electrical control device (12), which is electrically coupled to the electrically actuable control valve (52), for controlling the electrically actuable control valve (52), and having an electrical actuating device (122), which is coupled to the control device (12), for actuating the parking brake. In order to be able to resort to available series-produced components, the air-quantity-boosting valve device (34), the control valve (52), the electrical control device (12) and the actuating device (122) are in each case embodied as autonomous, separate components which are arranged spatially separate from one another.

Abstract: A brake system for a vehicle includes brake cylinders operated by pressurized fluid for actuation of brakes by means of pressurized fluid on at least one first axle of the vehicle. The brakes on at least one other, second, axle can be actuated exclusively electromechanically in response to an electrical braking request signal. The pressure of the pressurized fluid can be modulated indirectly or directly and the electrical braking request signal can be generated indirectly or directly in response to actuation of a brake pedal of a brake pedal device. A service brake function is provided by means of hybrid use of the brakes on the first axle(s) together with the brakes on the second axle(s). The brake cylinders operated by pressurized fluid are pneumatically operated brake cylinders. The pressure modulated by the brake pedal device is a pneumatic pressure, and the pressurized fluid is compressed air.

Abstract: An electro-pneumatic brake control device is provided for controlling the parking brake of a vehicle having compressed-air-actuated brake cylinders, at least one of which is a spring brake cylinder with a spring store part. Valve devices place the brake control device into various operating states. In a first operating state, the valve devices are at least partially supplied with current and switched such that a compressed air line to the spring store part of the spring brake cylinder is aerated. In a second state, the valve devices are at least partially supplied with current and switched such that the compressed air line is deaerated. In a third state, which can be activated in the event of failure of the electrical energy supply of the brake control device, the valve devices are switched to a currentless state such that the compressed air line is automatically deaerated in throttled manner.

Abstract: An electrically controlled brake system 10 for a tractor is provided that is equipped with an anti-jackknifing brake that can be actuated by means of a manual operating element and that acts only on the brakes of a trailer coupled to the tractor. The operating element is an electrical element which generates an electrical signal to control a valve device by means of which the braking force of the anti-jackknifing brake can be increased.

Abstract: A fluid-pressure brake system for a vehicle having a parking brake function in which, in response to actuation of an electrical parking brake signal transmitter, and without actuation of a brake pedal, at least one wheel brake of the brake system is actuated via an actuator to which the fluid is admitted. A parking brake module is provided in which there is integrated an electronic control unit as well as valve devices that are electrically actuatable by the electronic control unit. The electronic control unit actuates the parking brake function upon receiving from the parking brake signal transmitter an electrical actuating signal demanding actuation of the parking brake function and, as part of the parking brake function, the electronic control unit controls the admission of fluid to the actuator by means of the electrically actuatable valve devices.

Abstract: A control system for a vehicle braking systems includes an electronic control system and a brake signal transmitter having at least one circuit actuatable by a driver of the vehicle. Each circuit of the brake signal transmitter transmits an electrical brake signal having a value which is dependent upon an actuating force and/or an actuating stroke supplied to the brake signal transmitter. The electronic control system emits at least one electrical brake actuating signal which is dependent upon the electrical brake signal transmitted by the brake signal transmitter. An electronics block which includes at least a portion of the electronic control system is provided. The brake signal transmitter and the electronics block are integrated into a combined component.

Abstract: A process for reducing yaw during braking in a vehicle having an anti-lock braking system (ABS) and traveling on a roadway having different coefficients of friction on opposite sides of the vehicle comprises regulating the braking pressures in the wheels of the vehicle during ABS-controlled braking so that a permissible braking pressure difference (.DELTA.P) between the braking pressures in the high and low wheels is maintained. The permissible braking pressure difference (.DELTA.P) is calculated by an electronic system based on an algorithm that takes into account the frictional value of the road, and/or the load on the vehicle, and/or the wheel base of the vehicle, and/or the wheel gauge of the vehicle, and/or the level of the center-of-gravity of the vehicle. The algorithm increases the value of the permissible braking pressure difference (.DELTA.P) as the frictional value of the road, the load of the vehicle, and the wheel base of the vehicle increase.

Abstract: A process for reducing the yawing moment that develops during hard braking in a vehicle equipped with an anti-lock braking system (ABS) and traveling on a roadway having different coefficients of friction on opposite sides of the vehicle is disclosed. The driver must compensate for the yawing moment by steering towards the side that has the lower coefficient of friction. The process comprises venting the brake cylinder of the front wheel on the side with the higher coefficient of friction for a time t.sub.AH that is calculated in an electronic control module. The algorithm for computing t.sub.AH depends on the venting time t.sub.AL at the front wheel on the side with the lower coefficient of friction and the maximum or so-called deregulating pressures attained in the cylinders of the rear wheels. The electronic control module receives pressure information from pressure sensors and ascertains the venting time t.sub.AL that the ABS produces at the slipping front wheel.

Abstract: A process for reducing yaw during braking in a vehicle having an anti-lock braking system (ABS) and traveling on a roadway having different coefficients of friction on opposite sides of the vehicle, is disclosed. The process comprises detecting the braking pressures in the wheels of the vehicle, calculating a permissible braking pressure difference, and adjusting the braking pressures in the wheel on the high friction side (high wheel) so as to maintain the permissible braking pressure difference. The permissible braking pressure difference is a variable value which depends mainly on the deregulating pressure (P.sub.max) at which the ABS begins to deregulate in the low wheel.

Abstract: A process is disclosed for restoring brake pressure in a brake of a motor vehicle having an antilock brake system which subjects the brake to a brake regulating cycle. The brake regulating cycle comprises a pressure reduction phase, wherein the brake pressure is reduced from a deregulating pressure P.sub.max to a holding pressure P.sub.min, a pressure maintenance phase, wherein the holding pressure P.sub.min is maintained in the brake, and a pressure restoration phase, wherein the brake pressure in the brake is increased. According to the invention, during the pressure restoration phase the brake pressure is increased with a steep pressure gradient PG.sub.H during a first pressure increase stage until a pressure level P.sub.K is reached. Thereafter the brake pressure is increased with a low pressure gradient PG.sub.N in a second pressure increase stage. The steep pressure gradient PG.sub.H is calculated as a function of P.sub.max and P.sub.min of the last regulating cycle, while the low pressure gradient PG.

Abstract: A method is provided for at least approximately determining the frictional value utilized between a wheel and the roadway. The method uses a vehicle weight that is determined, at least approximately, and a momentary actuating energy of a brake that is determined during a braking action. The method calculates the frictional value from the momentary actuating energy, the vehicle weight, and the wheel braking factor. In another embodiment, the method determines, at least approximately, the momentary vehicle deceleration. The frictional value is calculated from the momentary vehicle deceleration during braking and the Earth's gravitational acceleration.