A method for braking at least one rotatable roller (25, 35) from at least one roller series (21, 31) in a straightening device (15; 15a) for straightening a cable being drawn through the straightening device along a conveying path by an external cable pull-in device, in particular an electrical or optical cable, comprising a straightener (20; 20a-20d), with a first roller series and with a second roller series, which can be moved relative to each other and between which the conveying path of the cable runs, wherein at least one of the two roller series (21, 31) has several rotatable rollers (25, 35), wherein the straightening device further comprises a braking device for braking at least one of the rotatable rollers (25, 35) from at least one of the two roller series (21, 31) of the straightener (20; 20a-20d), in particular for braking several rotatable rollers (25, 35) from at least one of the two roller series (21, 31) of the straightener (20; 20a-20d), wherein the braking device is a magnetic braking device in the form of an eddy current brake, comprising at least one permanent magnet or at least one electromagnet, which is configured in such a way that the braking effect is initiated by the rotatable rollers (25, 35) as a function of their rotational speed caused by the drawn cable, wherein the method comprises the following steps: - Straightening the at least one cable, and - Braking at least one of the rotatable rollers (25, 35) from at least one roller series (21, 31) in the straightening device (15; 15a) with the braking device, wherein the braking effect can be adjusted without contact, and adjusted to a pull-in speed of the cable, and wherein the braking effect is initiated by the rotatable rollers (25, 35) as a function of their rotational speed caused by the drawn cable. wherein at least one of the two roller series (21, 31) has several rotatable rollers (25, 35), wherein the straightening device further comprises a braking device for braking at least one of the rotatable rollers (25, 35) from at least one of the two roller series (21, 31) of the straightener (20; 20a-20d), in particular for braking several rotatable rollers (25, 35) from at least one of the two roller series (21, 31) of the straightener (20; 20a-20d), wherein the braking device is a magnetic braking device in the form of an eddy current brake, comprising at least one permanent magnet or at least one electromagnet, which is configured in such a way that the braking effect is initiated by the rotatable rollers (25, 35) as a function of their rotational speed caused by the drawn cable, wherein the method comprises the following steps: - Straightening the at least one cable, and - Braking at least one of the rotatable rollers (25, 35) from at least one roller series (21, 31) in the straightening device (15; 15a) with the braking device, wherein the braking effect can be adjusted without contact, and adjusted to a pull-in speed of the cable, and wherein the braking effect is initiated by the rotatable rollers (25, 35) as a function of their rotational speed caused by the drawn cable. - Straightening the at least one cable, and - Braking at least one of the rotatable rollers (25, 35) from at least one roller series (21, 31) in the straightening device (15; 15a) with the braking device, wherein the braking effect can be adjusted without contact, and adjusted to a pull-in speed of the cable, and wherein the braking effect is initiated by the rotatable rollers (25, 35) as a function of their rotational speed caused by the drawn cable.