Abstract: The present invention relates to a device for use with a bicycle brake system consisting of brake means including a housing secured to a handle bar, and a brake operating lever grippably secured to said housing; brake means for braking a wheel; and a Bowden cable for transmitting a gripping force on the brake operating lever in a direction in which the brake means acts to apply the brakes, said Bowden cable consisting of an inner cable and an outer sheath which operatively interconnect the brake means and the brake operating means, said device being arranged so that when gripping the brake operating lever to a predetermined extent fails to fully exert the intended braking action due, for example, to wear of the brake shoes and/or elongation of the Bowden cable, such decrease in or lack of the braking action is automatically compensated by utilizing the gripping action on the brake operating lever. The automatic adjusting device described above is substantially installed in the brake operating means.