An adjuster unit (100) for a vehicle disc brake (1), in particular an air disc brake (1) of a commercial vehicle, includes an adjustment spindle (101) adapted to be operatively coupled with one of the brake pads (9) such that by rotation in a first direction, the adjustment spindle (101) moves the brake pad (9) towards the disc (11). By rotation in a second direction opposite of the first direction, the adjustment spindle (101) moves the brake pad away from the disc (11). An actuator ring assembly (107) is rotatable about the adjustment spindle (101); and a wrap spring (109) is helically wound around the adjustment spindle (101). The wrap spring (109), being part of the adjuster unit, is positioned on the adjuster unit, in particular on the adjustment spindle, to engage a stop (117) upon rotation of the adjustment spindle (101) in the second direction, causing the diameter of the wrap spring (109) to increase.