The invention provides a vehicle brake system including a brake assembly providing a service brake and a parking brake having a brake disc assembly in common, a service brake circuit, a parking brake circuit, and a brake control arrangement adapted to control the service brake by selectively providing a fluid communication between a pressurising arrangement and the service brake via the service brake circuit, the brake control arrangement further being adapted to control the parking brake by selectively providing a fluid communication between the pressurising arrangement and the parking brake via the parking brake circuit, and by selectively draining the parking brake circuit, wherein the vehicle brake system includes a draining circuit adapted to drain the service brake circuit to avoid overload of the brake disc assembly.

The invention provides a vehicle brake system including a brake assembly providing a service brake and a parking brake having a brake disc assembly in common, a service brake circuit, a parking brake circuit, and a brake control arrangement adapted to control the service brake by selectively providing a fluid communication between a pressurising arrangement and the service brake via the service brake circuit, the brake control arrangement further being adapted to control the parking brake by selectively providing a fluid communication between the pressurising arrangement and the parking brake via the parking brake circuit, and by selectively draining the parking brake circuit, wherein the vehicle brake system includes a draining circuit adapted to drain the service brake circuit to avoid overload of the brake disc assembly.

An electromechanical brake actuator (100) is configured to move a service-brake rod (104) between a full-braking position (BP) and a drive position (DP). A parking-brake rod (112) is coupled to the service-brake rod and is movable between a first position (P1) for locking the service-brake rod (104) in the full-braking position (BP), and a second position (P2) where the service-brake rod (104) is free to be moved. A spring element (116) coupled to the parking-brake rod is arranged so that in a fully-compressed state (CS) the parking-brake rod is in the second position, and in a fully-released state (RS) the parking-brake rod is in the first position. A hydraulic unit (118) is operatively coupled to the parking-brake rod and configured, based on a parking-brake signal, to lock the parking-brake rod or allow a release of the spring element to the fully-released state.

An electromechanical brake actuator (100) is configured to move a service-brake rod (104) between a full-braking position (BP) and a drive position (DP). A parking-brake rod (112) is coupled to the service-brake rod and is movable between a first position (P1) for locking the service-brake rod (104) in the full-braking position (BP), and a second position (P2) where the service-brake rod (104) is free to be moved. A spring element (116) coupled to the parking-brake rod is arranged so that in a fully-compressed state (CS) the parking-brake rod is in the second position, and in a fully-released state (RS) the parking-brake rod is in the first position. A hydraulic unit (118) is operatively coupled to the parking-brake rod and configured, based on a parking-brake signal, to lock the parking-brake rod or allow a release of the spring element to the fully-released state.

A parking brake system for vehicles, in particular heavy-duty vehicles, is provided. The parking brake system has a parking brake actuator having an actuation pushrod slidably housed within an actuator cylinder and adapted to act on a release mechanism of a vehicle brake for unlocking the vehicle brake, and a hydraulic pump operated by an electric motor, adapted to deliver a flow of fluid into the actuator cylinder for moving the actuation pushrod.

A parking brake system for vehicles, in particular heavy-duty vehicles, is provided. The parking brake system has a parking brake actuator having an actuation pushrod slidably housed within an actuator cylinder and adapted to act on a release mechanism of a vehicle brake for unlocking the vehicle brake, and a hydraulic pump operated by an electric motor, adapted to deliver a flow of fluid into the actuator cylinder for moving the actuation pushrod.

A hydraulic transaxle facilitates mounting a parking brake unit which requires no link mechanism and is compact. The parking brake unit includes a brake rotor provided on a rotation shaft and a locking member being displaceable between a first position where the brake rotor is locked and a second position where the brake rotor is unlocked. The locking member includes a locking portion which is engaged in a recess formed in the brake rotor that locks the brake rotor in the first position, and a non-locking portion which is placed at a position corresponding to the recess and which separates from the brake rotor in the second position. The hydraulic transaxle further includes an oil-supply mechanism capable of displacing the locking member to the second position.

A hydraulic transaxle facilitates mounting a parking brake unit which requires no link mechanism and is compact. The parking brake unit includes a brake rotor provided on a rotation shaft and a locking member being displaceable between a first position where the brake rotor is locked and a second position where the brake rotor is unlocked. The locking member includes a locking portion which is engaged in a recess formed in the brake rotor that locks the brake rotor in the first position, and a non-locking portion which is placed at a position corresponding to the recess and which separates from the brake rotor in the second position. The hydraulic transaxle further includes an oil-supply mechanism capable of displacing the locking member to the second position.

The invention relates to a track assembly for a tracked vehicle. Said track assembly comprises a track support beam configured to support road wheels, a drive wheel member, and a drive arrangement for drive wheel member operation and an endless track disposed around said road wheels and drive wheel member. Said drive arrangement comprises a brake arrangement for braking the drive wheel member, and a drive axle coaxially arranged relative to a centre axis of said drive wheel member for rotating said drive wheel member. Said brake arrangement is configured to be journaled in bearings in connection to a portion of the drive axle. Said brake arrangement comprises a torque arm configured to be connected to said track support beam so as to essentially prevent rotation of a brake housing of said brake arrangement about said centre axis.

Disclosed is a brake arrangement for a tracked vehicle comprising a brake housing. Said brake arrangement is journaled in bearings in connection to a drive unit driven drive axle configured to rotate a drive wheel member. Said brake arrangement comprises a set of ring shaped friction elements arranged about said drive axle and configured to be pressed together in the axial direction for providing a braking function. Said brake arrangement further comprises a ring shaped parking brake piston device coaxially arranged around said drive axle in connection to a radially outer portion of said set of friction elements. Said parking brake piston device is configured to provide pressure in the axial direction against said radially outer portion of said set of friction elements based on a parking brake action so as to press said elements together for preventing rotation of said drive axle, preventing movement of drive wheel member.