In food processor, place chickpeas. Cover; process with quick on-and-off motions until smooth, adding enough reserved liquid (about 1/4 cup) to make a creamy mixture. Add roasted peppers, vinegar, 1 tablespoon oil and the garlic; process until smooth. If desired, season with salt to taste. Spoon into serving bowl. Let stand 30 minutes to blend flavors, or cover and refrigerate until serving time.