Motor sealing

A motor sealing part for ensuring the tightness of connection between a brushless direct current (BLDC) motor assembly (1; fig. 1) and a valve block (7; fig. 1) of a brake system, for example a brake-by-wire electrohydraulic brake system. The motor sealing has a central hole CH configured to receive a spindle (3.1; fig. 2) of a ball screw drive (3; figs 1 and 2), and a plurality of peripheral holes PH for receiving fixing elements. On the perimeter of the central hole CH, there are a first pair of identical diametrically opposed pockets P1 of a first depth (X1; fig. 5), and perpendicular to these a second pair of identical diametrically opposed pockets P2 of a second depth (X2; fig. 5), the second depth being greater than the first depth. The pockets P1, P2 are for accommodating the protuberances of a torque support (6; figs. 1 to 3b). The different depths of the pockets enable two mounting positions of the torque support to allow for different amounts/volumes of braking liquid in the braking system.