Reasons for one wheel not moving after releasing the handbrake include prolonged parking, sticking of the master cylinder cup, non-return of the brake wheel cylinder, brake pads frozen due to icing, and excessively high temperature of the brake pads from prolonged braking. Corresponding solutions are as follows: Prolonged parking: Generally, if the handbrake is engaged when there is water in the brake drum after washing the car or rain, prolonged parking can cause the wheel to lock. The driver can use the vehicle's power to move the tire. Sticking of the master cylinder cup, non-return: The solution to this issue is to clean the entire brake system and replace the master cylinder cup. Non-return of the brake wheel cylinder: This can be fixed by sanding and applying grease. If the wheel cylinder itself is faulty, it needs to be replaced directly. Brake pads frozen due to icing: Melt the ice with hot water or gently tap the brake drum with a blunt object like a hammer. Excessively high temperature from prolonged braking, causing the brake pads to fail to separate: Depending on the situation, the brake pads may need to be sanded or replaced directly. Reasons for brake failure are as follows: Lack of necessary maintenance: Insufficient maintenance of the brake system, excessive impurities in the brake master cylinder, poor sealing, failure of the vacuum booster, contaminated brake fluid or mixing different types of brake fluid leading to vapor lock when heated, leakage in the brake master or wheel cylinder, or air leaks in the air reservoir or pipe connections. Improper operation: Mechanical failure due to improper operation, such as prolonged downhill driving causing the brake pads to overheat, carbonization of the brake drum, and complete loss of braking function. Severe overloading: Due to severe overloading, the increased inertia from gravitational acceleration directly leads to brake failure.
