Abstract: Disclosed is driving unit (1) for a brake (100) comprising: a driving device (2); a hydraulic pump (3) driven by said driving device (2); a hydraulic cylinder (5) in fluid communicating with the hydraulic pump (3) and driven by said hydraulic pump (3). The hydraulic pump (5) is operably connected with one piston rod (7) to drive the piston rod (5) to reciprocate, said piston rod (5) is drivingly connected with a braking portion (8) of the brake (100). The driving unit (1) is further provided with a holding device (10) for keeping the braking portion (8) under an operation state. The present invention further discloses a brake (100) having such driving unit (1).