A powered vehicle includes a spring-applied hydraulic release (SAHR) vehicle brake comprising first and second mutually engageable brake elements. The first brake element is secured to or forms part of a rotatable element of the drive train of the vehicle and the second is non-rotatably moveably mounted on the vehicle such that the first and second elements are mutually engageable with and separable from one another. Mutual engagement of the brake elements causes braking of rotation of the rotatable element. The SAHR vehicle brake includes (i) a resiliently deformable member acting on the second brake element so as to urge the first and second brake elements into mutual engagement and (ii) a hydraulic control circuit for applying hydraulic pressure to the second brake element so as to oppose the action of the resiliently deformable member and thereby normally maintain the first and second brake elements separated from one another.

A brake system for a vehicle, the vehicle including a service brake control module and a parking brake with at least one spring brake chamber, the service brake control module controlling at least a first pressure module to brake a first set of wheels. The brake system comprises a parking brake control module configured to control the spring brake chamber to brake a second set of wheels and to control the first pressure module to brake the first set of wheels.

A brake system, method for controlling the brake system and a mine vehicle having the same are provided. The brake system of the mine vehicle includes spring activated and hydraulically released brake assemblies in connection with wheels of the vehicle. The brake assemblies have hydraulic release actuators, which are pressurized for releasing the brakes. During normal operation, the release actuators are pressurized by a main brake circuit and are controlled by a brake controller. A separate release circuit and pressure source may be activated for releasing the brakes when the vehicle is disabled. The system further includes an override device for selectively depressurizing the release actuators during towing.

A brake system, method for controlling the brake system and a mine vehicle having the same are provided. The brake system of the mine vehicle includes spring activated and hydraulically released brake assemblies in connection with wheels of the vehicle. The brake assemblies have hydraulic release actuators, which are pressurized for releasing the brakes. During normal operation, the release actuators are pressurized by a main brake circuit and are controlled by a brake controller. A separate release circuit and pressure source may be activated for releasing the brakes when the vehicle is disabled. The system further includes an override device for selectively depressurizing the release actuators during towing.

A system for controlling compounding in a vehicle brake actuator includes first and second valves configured to control, respectively, a first fluid pressure in a parking brake chamber of a brake actuator that acts against a spring force applied by a spring of the actuator to a pushrod of the actuator and a second fluid pressure in a service brake chamber of the actuator that applies a fluid force to the pushrod. A controller is configured to receive first and second fluid pressure signals indicative of the first and second fluid pressures, determine a total brake actuator force applied to the pushrod responsive to the first and second fluid pressure signals and control at least one of the first and second valves responsive to the total brake actuator force to adjust a corresponding one of the first and second fluid pressures and thereby obtain an adjusted total brake actuator force.

A system for controlling compounding in a vehicle brake actuator includes first and second valves configured to control, respectively, a first fluid pressure in a parking brake chamber of a brake actuator that acts against a spring force applied by a spring of the actuator to a pushrod of the actuator and a second fluid pressure in a service brake chamber of the actuator that applies a fluid force to the pushrod. A controller is configured to receive first and second fluid pressure signals indicative of the first and second fluid pressures, determine a total brake actuator force applied to the pushrod responsive to the first and second fluid pressure signals and control at least one of the first and second valves responsive to the total brake actuator force to adjust a corresponding one of the first and second fluid pressures and thereby obtain an adjusted total brake actuator force.

A control system and method control release of a braking device from a wheel or disc. Release of the braking device is slowed or stopped based on a speed at which the braking device is released. The braking device may include a return limiting device through which a rod is configured to move. The return limiting device permits the rod to slide within the return limiting device while the brake pad holder releases from the wheel or disc no faster than a designated speed, but engages and restricts movement of the rod within the return limiting device while the brake pad holder releases from the wheel or disc faster than the designated speed.

A control system and method control release of a braking device from a wheel or disc. Release of the braking device is slowed or stopped based on a speed at which the braking device is released. The braking device may include a return limiting device through which a rod is configured to move. The return limiting device permits the rod to slide within the return limiting device while the brake pad holder releases from the wheel or disc no faster than a designated speed, but engages and restricts movement of the rod within the return limiting device while the brake pad holder releases from the wheel or disc faster than the designated speed.

A parking brake of a work vehicle has a piston near the wheel relative to an end plate in an axial direction parallel to a rotation axis of the drive shaft to move in the axial direction, a hub between the end plate and the piston in the axial direction to be connected to the drive shaft, a cylinder disposed outwardly from the hub in a radial direction relative to the rotation axis, a disk supported by the hub in an inner space defined by the end plate, the piston, the hub, and the cylinder, a separator supported by the cylinder, next to the disk in the inner space, and moved by the piston in the axial direction, a first passage connecting the inner space and an outer space, and a second passage provided outwardly from the first passage in the radial direction to connect the inner and outer spaces.

A parking brake of a work vehicle has a piston near the wheel relative to an end plate in an axial direction parallel to a rotation axis of the drive shaft to move in the axial direction, a hub between the end plate and the piston in the axial direction to be connected to the drive shaft, a cylinder disposed outwardly from the hub in a radial direction relative to the rotation axis, a disk supported by the hub in an inner space defined by the end plate, the piston, the hub, and the cylinder, a separator supported by the cylinder, next to the disk in the inner space, and moved by the piston in the axial direction, a first passage connecting the inner space and an outer space, and a second passage provided outwardly from the first passage in the radial direction to connect the inner and outer spaces.