Disclosed is a brake system for a railroad vehicle, including a parking brake provided with a piston and having a first configuration in which the piston is in a working position in which it acts on a lining support and applies a predetermined force to a brake disc; a second configuration in which the piston is in a rest position in which it does not act on the support and does not apply any force to the disc; and a third configuration in which, when the vehicle is not at a standstill and the ambient temperature in the environment of the disc is greater than a threshold value, it forces the piston to move towards a trip position different from its working and rest positions, in order to limit or cancel the force applied to the disc.

A parking brake apparatus is provided for a vehicle including a vehicle drive train that extends between a vehicle propulsion engine and a vehicle wheel. The parking brake apparatus comprises a wheel drum located away from the vehicle wheel and fixedly attached to a drivetrain shaft that extends along a portion of the vehicle drive train between the vehicle propulsion engine and the vehicle wheel. The parking brake apparatus also comprises activatable drum brake components disposed in an interior chamber of the wheel drum. When activated, the drum brake components apply a clamping force to the wheel drum to prevent the wheel drum and the drivetrain shaft fixedly attached thereto from rotating and thereby preventing the vehicle wheel from rotating to provide the vehicle with a parking brake functionality.

A wedge unit for a braking device with brake lining carriers includes a wedge configured to be displaced in an actuation direction for spreading the brake lining carriers, and an adjusting element configured to displace the wedge, wherein the wedge is displaceable to the adjusting element.

A brake piston for a disc brake assembly has a body portion and an end face of the body portion. An annularly extending first portion of the end face has a first radius and an annularly extending second portion of the end face has a second radius that is less than the first radius. A plurality of first ribs extend radially inward from the first portion to the second portion and a plurality of second ribs extends radially outward from the second portion to the first portion. The first and second ribs are interspaced. The second portion and the second ribs are recessed into the end face relative to the first portion and the first ribs.

A brake piston for a disc brake assembly has a body portion and an end face of the body portion. An annularly extending first portion of the end face has a first radius and an annularly extending second portion of the end face has a second radius that is less than the first radius. A plurality of first ribs extend radially inward from the first portion to the second portion and a plurality of second ribs extends radially outward from the second portion to the first portion. The first and second ribs are interspaced. The second portion and the second ribs are recessed into the end face relative to the first portion and the first ribs.

Disclosed is a brake system for a railroad vehicle, including a parking brake provided with a piston and having a first configuration in which the piston is in a working position in which it acts on a lining support and applies a predetermined force to a brake disc; a second configuration in which the piston is in a rest position in which it does not act on the support and does not apply any force to the disc; and a third configuration in which, when the vehicle is not at a standstill and the ambient temperature in the environment of the disc is greater than a threshold value, it forces the piston to move towards a trip position different from its working and rest positions, in order to limit or cancel the force applied to the disc.

Disclosed is a brake system for a railroad vehicle, including a parking brake provided with a piston and having a first configuration in which the piston is in a working position in which it acts on a lining support and applies a predetermined force to a brake disc; a second configuration in which the piston is in a rest position in which it does not act on the support and does not apply any force to the disc; and a third configuration in which, when the vehicle is not at a standstill and the ambient temperature in the environment of the disc is greater than a threshold value, it forces the piston to move towards a trip position different from its working and rest positions, in order to limit or cancel the force applied to the disc.

Disclosed is a brake system for a railroad vehicle, including a parking brake provided with a piston and having a first configuration in which the piston is in a working position in which it acts on a lining support and applies a predetermined force to a brake disc; a second configuration in which the piston is in a rest position in which it does not act on the support and does not apply any force to the disc; and a third configuration in which, when the vehicle is not at a standstill and the ambient temperature in the environment of the disc is greater than a threshold value, it forces the piston to move towards a trip position different from its working and rest positions, in order to limit or cancel the force applied to the disc.

A park brake system for an electric motor actuator is provided. The system may comprise a wrap spring that may rotatably engage the shaft. In this regard, the system may be configured to exert a radial force on a shaft of the electric motor actuator to lock the actuator. Moreover, in various embodiments, the system may be bi-stable.

A parking brake apparatus is provided for a vehicle including a vehicle drive train that extends between a vehicle propulsion engine and a vehicle wheel. The parking brake apparatus comprises a wheel drum located away from the vehicle wheel and fixedly attached to a drivetrain shaft that extends along a portion of the vehicle drive train between the vehicle propulsion engine and the vehicle wheel. The parking brake apparatus also comprises activatable drum brake components disposed in an interior chamber of the wheel drum. When activated, the drum brake components apply a clamping force to the wheel drum to prevent the wheel drum and the drivetrain shaft fixedly attached thereto from rotating and thereby preventing the vehicle wheel from rotating to provide the vehicle with a parking brake functionality.