DETROIT — Ford plans to fix 17,600 Mercury Milan and Ford Fusion gas-electric hybrids because of a software problem that can give drivers the impression that the brakes have failed.

The automaker says the problem occurs in transition between two braking systems and at no time are drivers without brakes.

The decision to fix the 2010 model cars came after a test driver for Consumer Reports magazine experienced the problem as he was driving a Fusion Hybrid.

Ford spokesman Said Deep says braking power seems to drop away as the car makes a transition from regenerative brakes to the conventional system. The Ford hybrids have regenerative brakes, which capture energy from braking to help recharge the battery, in addition to a conventional system that stops the car using hydraulic pressure.

Deep says Ford will notify the car owners to bring their cars in for a software fix. He said there is no safety problem with the cars. The automaker called the repairs a "customer satisfaction program" and said it was not a full-fledged recall.