Disk brake piston retractor

A disk brake piston retractor comprising:

• a first plate (11);
• a second plate (12) made of a ferromagnetic material and formed with a pothole (42);
• a threaded rod (20) comprising a first end (21) connected to the first plate (11), a second end (22) located opposite to the first end (21), and a thread (23) extending on a periphery;
• an internal tube (30) comprising a first end (31), a second end (32) insertable in the pothole (42), a first bore (33) extending in the internal tube (30) from the first end (31) of the internal tube (30), a second bore (34) extending in the internal tube (30) from the second end (32) of the internal tube (30), and a thread (35) extending on a periphery, wherein the first bore (33) receives the threaded rod (20), wherein the thread (23) of the threaded rod (20) extends opposite to the thread (35) of the internal tube (30);
• a quick release unit (40) operable for connecting the second end (32) of the internal tube (30) to the second plate (12) in a quick-release manner, wherein the quick release unit (40) comprises a magnet (43) fitted in the second bore (34) of the internal tube (30);
• and
• an external tube (50) comprising a first end (51), a second end (52) located opposite to the first end (51), a first screw hole (53) extending in the external tube (50) from the first end (51) of the external tube (50), a second screw hole (54) extending in the external tube (50) from the second end (52) of the external tube (50), wherein the first screw hole (53) receives the thread (23) of the threaded rod (20), wherein the second screw hole (54) receives the thread (35) of the internal tube (30).