An electric parking brake actuator has an actuator device, a brake device and a cable-tension measuring device. The multi-layer film comprises an outer layer of an elastomeric thermoplastic material such as a polyurethane, an inner layer of an elastomeric thermoplastic material such as a polyurethane and a barrier layer interposed therebetween which is derived from a combination of at least one ethylene-vinyl alcohol copolymer and up to about 50 wt. Further, when the disc reproducing section is in its non-reproducing position, the position detecting means is adapted to detect the position of a disc which has been transported from the outside into the apparatus.