A radial piston machine includes a multi-disc brake, a brake disc assembly of which interacts with a first annular section on a drive shaft and a second annular section on a housing. The brake disc assembly is disposed within a brake chamber. The first annular section and the second annular section each delimit the brake chamber in sections. A disc section, a spring, a brake piston, and the brake disc assembly are disposed next to one another in a specified sequence along an axis of rotation in such a way that a force of the spring is transmitted to the brake disc assembly.

A rotary cam radial engine formed of two primary components engaged at a mid section to allow for an easy repair to the vehicle. The device features a body having radially oriented apertures; and a plurality of pistons in a respective reciprocating engagement, within each respective said cylinder. The pistons are driven by low pressure fluids and/or a vacuum and the engine being formed of two main components can be taken apart without tools for maintenance and reconfiguration.

A radial piston machine includes a piston having a base which is provided with a roller. The roller is held secure by a bearing shell that is inserted in the piston base.