Air brake backup system designe and analysis

The current bus brake system, that consists of two parts, air brake and exhaust brake. The exhaust brake system not enough to replace the air brake system. This research focuses on the new backup brake mechanism, using several valves and backup compressed air accumulators are inserted into the main brake system to provide brake force. When air brake failure, backup system can be using slow down and reduce brake distance for requirements ability and air brake to make vehicle can be safe. Finally, according to the experimental results, when the rear brake system failure, the proposed system can be let the vehicle brake performance keeps above 90% of the original performance. If the front and rear brake system failure, the backup brake mechanism still keep the brake performance about 75% of the original value.