Patent ID: 8091689

Claim:
Automatic parking brake acting on a disk brake comprising an elastic device situated inside a cavity ( 11 ) of a piston ( 2 ) of a brake, said device being intended to receive, via the inlet ( 13 ) of the cavity, braking forces and to pass them on to the end ( 12 ) of the cavity ( 11 ) of said piston so that the latter can exert a braking force on brake pads of the disk brake, a spring ( 1 ) allowing pressure to be applied to the end ( 12 ) of the piston cavity, a first washer ( 5 ) positioned between the inlet ( 13 ) of the cavity and the spring ( 1 ), a pressing device allowing pressure to be applied to the washer ( 5 ) so that it preloads the spring ( 1 ), characterized in that a first nut ( 4 ) provided with an external screw thread or ring threaded on its external peripheral surface and in that the interior wall of the inlet ( 13 ) of the cavity ( 11 ) comprises an internal screw thread into which said first nut ( 4 ) is screwed, a central core ( 3 ) positioned along the axis of the spring ( 1 ) and of the washer ( 5 ), and intended to press against the end ( 12 ) of the piston cavity via a first extremity, a second extremity of the central core protruding from beyond the first washer towards the inlet ( 13 ) of the cavity and comprising a threaded part, a second nut ( 9 ) being screwed onto this threaded part and being intended to adjust the position of the central core with respect to the end ( 12 ) of the cavity ( 11 ) of the piston and to press against the first washer in order to transmit braking forces to the end of the cavity of the piston.