There are four return springs on most Garellis for each brake. One spring that is almost always broken is at the perch inside each brake lever on handle bar. The second spring will be outside and near center of wheel on the brake backing plate and returns the brake arm which connects to end of cable. Third and fourth which are the most important springs are the ones attaching the pair of "shoes" inside each brake drum at center of wheel. Check all this first before proceeding.