A spring brake actuator (2) for use in a commercial vehicle includes a cylinder housing (4) including a spring brake piston (10) for applying a braking force, a spring guide (12) attached to the spring brake piston (10). The spring guide (12) includes a valve (14) and a retaining device (16) for retaining the valve (14). The retaining device (16) includes a basic body (34) and clamping portions (36) for clamping the retaining device (16) to the spring guide (12). The clamping portions (36) are arranged at the basic body (34) along a circumference (38) thereof, and the clamping portions (36) are spaced apart from each other forming slits (40) between the clamping portions (36) to allow for a circulation of air through the slits (40).

The vehicle brake includes a pedal being pressed against for braking by a driver, a master cylinder unit, pressure of oil in the master cylinder being increased by the pedal, a block unit in which a hydraulic circuit unit is formed, the hydraulic circuit unit being connected to the master cylinder unit, being supplied with the oil from the master cylinder unit, and increasing the pressure of the oil when electric power is supplied thereto, a wheel cylinder unit being connected to the block unit and providing a braking force to a wheel, and a filter unit being mounted on the block unit and filtering the oil provided from the master cylinder unit.

The vehicle brake includes a pedal being pressed against for braking by a driver, a master cylinder unit, pressure of oil in the master cylinder being increased by the pedal, a block unit in which a hydraulic circuit unit is formed, the hydraulic circuit unit being connected to the master cylinder unit, being supplied with the oil from the master cylinder unit, and increasing the pressure of the oil when electric power is supplied thereto, a wheel cylinder unit being connected to the block unit and providing a braking force to a wheel, and a filter unit being mounted on the block unit and filtering the oil provided from the master cylinder unit.

A pneumatic piston for an electropneumatic modulator in which the modulator includes a piston housing with a chamber for receiving the pneumatic piston. The pneumatic piston includes a sealing element for sealing an intermediate space between the pneumatic piston and the piston housing; a piston body with a recess for receiving the sealing element; and a securing element configured to fix the sealing element in the recess in a form-fitting manner.

A pneumatic piston for an electropneumatic modulator in which the modulator includes a piston housing with a chamber for receiving the pneumatic piston. The pneumatic piston includes a sealing element for sealing an intermediate space between the pneumatic piston and the piston housing; a piston body with a recess for receiving the sealing element; and a securing element configured to fix the sealing element in the recess in a form-fitting manner.