What Causes Air Brake Lock-Up?

[ClaireAnn]

The causes of air brake lock-up include: excessively small or no clearance in the brake master cylinder; failure of the vacuum booster; the brake master cylinder being stuck; the brake fluid pipe being blocked, preventing fluid return; or the brake caliper being stuck. Brake Caliper Not Retracting: Simply put, even when the brake pedal is not pressed, there is still a noticeable increase in vehicle resistance. In severe cases, abnormal noises may occur or even wheel lock-up. If the brake fluid has not been changed for a long time, leading to internal rust in the brake caliper, it can be repaired by sanding and applying grease. If the caliper itself is faulty, it may need to be replaced directly. Static Wheel Lock-Up: After the vehicle is parked statically, the wheels may lock up overnight. This phenomenon often occurs in vehicles with drum brakes on the rear wheels. The friction linings are semi-metallic-based brake pads, and the brake drums are cast iron components. When the handbrake is engaged, the brake pads and drums are tightly pressed together. Exposure to water can cause metal oxidation and rust, leading to adhesion. Solutions include spraying rust remover or sanding with sandpaper.