I purchased a clearance priced Huffy "Santa Fe" cruiser and I have noticed during non powered test rides that the coaster brakes are barely there. When I try to brake the bike slows to a stop but I cannot lock up the rear wheel. Is this just a symptom of a cheap bike or might I have messed something up when I greased the bearings and installed the rear sprocket? In either case what can I do make the brakes more effective? I'm installing front and rear brakes in addition to the coaster but I want to have as much stopping power as possible. Thanks for any advice!