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How to eliminate the brake system is not working 1. Troubleshooting 1 Brake booster Vacuum hose connector is loose or the hose is leaking. 2 The brake shoe or pad has poor quality. 3 The brake shoe is bent or broken. 4 The caliper jams or flutters on the guide pin, and the rear brake shoe sways on the support base plate. 5 The caliper, brake cylinder, master cylinder's piston sticks or sticks. 6 vacuum booster check valve failure. 7 Vacuum booster stuck inside. 8 The main oil return port of the master cylinder is blocked by dirt and the brake fluid cannot return to the reservoir. 9 The brake pipe is blocked or not smooth. 10 Use unqualified brake fluid to inflate the rubber parts and get stuck in the cylinder bore. 2. Remedy 1 Fasten the connection or replace the leaky hose. 2 Replace the brake shoe or pad. 3 Replace failed brake shoes. 4 Replace the guide pin and bushing, remove rust dirt on the rear brake support plate, or replace the brake plate. 5 Servicing the caliper, brake cylinder, and master cylinder, replacing defective parts if necessary. 6 Check the check valve step: Start the engine first, increase the speed to 1500 rpm, and immediately stop the engine. Wait 2 minutes before pressing the brake pedal again. For example, the frequency of vacuum assist is less than two, indicating that the check valve is damaged. 7 Check the booster method: In case of engine stalling, step on the brake pedal several times and use up the vacuum in the system. Then place the foot on the brake pedal and start the engine. If the height of the brake pedal is reduced, the pedal can be kept in the braking position with less pressure, which means that the vacuum booster system is working properly, otherwise the booster should be replaced. 8 Check or replace the master cylinder. 9 Clean the pipeline dirt with compressed air and replace the defective parts. 10 Replace all rubber parts, combined valves and hoses, and use the original brake fluid.