I was pulling into a driveway after i fully stopped my car ( i was waiting for another car to pull out of driveway first). when i braked to stop my car it did not respond initially. i could not stop it fast enough to avoid collision w a parked car in driveway. this was so strange because i was moving my car very slowly. i then put it in reverse to back up a couple feet so i could assess damage to cars. when i did this and pressed the accelerator my car accelerated out of control into street. once again the braking was insufficient to stop my car as desired. normally the brakes stop this car on a dime (not really on a dime, but normally the brakes are excellent). the later acceleration was witnessed by the owner of the now rear-ended car in driveway. no damage to my car other than to my license plate. no one was injured. there was damage to the parked car in driveway. the damaged car was an older car, a 1970-something bmw, so it didn't have the cool new bumpers that can absorb a low speed impact. very scary in spite of the relatively the low speeds and short distance & duration of event, this issue could hurt someone. *js