after a change of linings or in the case of an increasing wear of the brake shoes the adjusting spindle 72 and 73 are rotated by a certain distance by the adjusting device 74 and therefore bring the ventilating play to the desired value possibly after a repeated operating of the brake in this manner it is ensured that the disc brake according to the invention remains operable up to a complete abrasion of the brake shoes 10 the first embodiment of the synchronizing device according to the invention illustrated in of fig2 and 3 transmits the adjusting rotating movement of the adjusting device 74 by the eccentric 6 serving as the force transmitting shaft which in the present example therefore forms an eccentric roller onto the adjusting spindle 73 since according to the above description when an abrasion of the brake shoes exists which must be compensated an adjusting moment occurs even before the brake shoes 10 rest against the brake disc 1 at the point in time of the desired synchronization the eccentric roller 6 is pressed into the half shell shaped bearing of the transverse member 7 only by the force of the spring 78 the friction force which exists in this case can be overcome by the adjusting device 74 without any response of the sliding clutch arranged in the adjusting device 74 only when the brake shoes 10 rest against the brake disc 1 does this friction force become so high that the eccentric roller 6 can no longer be rotated in which case the sliding clutch will respond anyhow at this point in time as explained above in the inoperative condition of the brake or of the rotary.