What is the reason for the motorcycle's rear drum brake not returning to position?

[MacGeorge]

Motorcycle's rear drum brake not returning to position is because the internal brake shoes are excessively worn and stuck on the brake drum. Simply replacing the brake shoes inside the wheel brake will solve the issue. Below is relevant information about drum brakes:1. Introduction: Drum brakes utilize stationary brake shoes inside the brake drum to create friction against the rotating brake drum attached to the wheel, thereby generating friction to reduce the wheel's rotational speed.2. Principle: When the brake pedal is pressed, the force applied by the foot pushes the piston in the master cylinder to move the brake fluid forward, creating pressure in the hydraulic lines. This pressure is transmitted through the brake fluid to the wheel cylinders at each wheel, where the pistons push the brake shoes outward, causing them to rub against the inner surface of the brake drum and generate sufficient friction to reduce the wheel's speed, achieving braking.

[AnthonyAnn]

As a seasoned motorcyclist with 15 years of experience, I've encountered multiple instances of rear brake failure to return to position. The primary causes are often a broken or weakened small spring that fails to retract the brake arm, or rusted cables stuck in the sleeve and unable to move, especially common after riding in the rain when moisture accelerates rusting. Excessive brake pad wear causing them to bind too tightly with the drum, or accumulated dirt and mud sticking can also jam the brakes. I've also found that hydraulic brake fluid deficiency or piston contamination can lead to piston sticking. While I've tried disassembling and cleaning or adjusting the spring myself, I never feel entirely confident—it's best to head straight to a professional shop for inspection. Ignoring it risks dragging brakes during rides, leading to overheating, increased fuel consumption, and dangerous loss of control during emergency stops. Regular rust-proof oil sprays and component checks are key preventive measures to avoid minor issues escalating into major accidents.

[VonKennedy]

When encountering a rear drum brake that doesn't retract, I prioritize checking a few simple points: whether the spring tension is sufficient—replacing it might solve the issue; whether the cable is rusted or clogged with dirt—try dripping some lubricating oil; if it's a hydraulic brake, low or dirty brake fluid can cause the piston to stick—topping up the fluid, bleeding the system, or replacing the fluid can help. Additionally, excessive dust inside the brake drum or worn-out shoes reducing clearance can be resolved by cleaning or replacement. High humidity environments, like riding near the coast, increase the risk of rust, so it's advisable to inspect the cables and clean the internals every six months to prevent sudden failures. Don't delay repairs—if the brake sticks, the wheel can overheat and wear out quickly, increasing the risk of skidding during turns. It's safer to have a reliable mechanic diagnose and fix the issue promptly and accurately.

[Carolyn]

Last year, my motorcycle had a similar issue with the rear brake—it would get stuck when pressed and wouldn't release, causing the rear wheel to drag and make a buzzing noise while riding. I was terrified and immediately drove it to the repair shop. The mechanic said the spring had aged and snapped, so they replaced it with a new one, which fixed the problem right away. They suspected the damage was accelerated by rust from a previous heavy rainstorm. A friend also mentioned that cable wear or mud jamming could cause similar failures. Since then, I've learned to regularly spray anti-rust lubricant on the cables and joints, especially checking more often during humid seasons. A stuck brake is no small matter—it not only damages the tires and increases fuel consumption but could also lead to a dangerous situation if the brake fails during an emergency stop at an intersection. Don’t hesitate—get it fixed right away.

[StAshlyn]

If the rear drum brake fails to retract, you must stop immediately for handling, as the stuck brake will cause the wheel to drag, increasing resistance and making it difficult to control the vehicle. This is especially dangerous during sharp turns or downhill driving, where loss of control and accidents are more likely. Prolonged dragging can also overheat and damage the braking system. Main causes include spring failure with insufficient tension, rusty or dirty cables hindering smooth sliding, excessively tight or worn brake shoes, or dust accumulation causing sticking. If encountered, you can try gently pressing the brake lever to check the rebound force and perform simple cleaning of dirt, but never force the ride. It's best to send it to a professional repair shop immediately for a thorough inspection. For prevention, keep the cables lubricated, regularly clean dirt inside the drum brake, and pay special attention to rust prevention after rain. Safety first—any brake abnormalities should be prioritized for resolution.

[DelKaleb]

While studying motorcycle malfunctions, I found that the principle reasons for a rear drum brake failing to retract are mainly insufficient spring tension or excessive friction resistance. If the spring is broken or weakened, it cannot pull the brake arm back; rust inside the cable increases sliding friction, causing it to jam; brake pads that are too thin or have too little clearance can bind too tightly; and dirt or grease can cause the contact surfaces to stick together. For hydraulic brakes, insufficient brake fluid or air bubbles may also cause piston jamming. Environmental factors like high humidity accelerate oxidation, making the issue more likely to recur after rain. I've tried disassembling and spraying rust remover on the cable, measuring spring strength and replacing it, but complex situations like misalignment require professional tools for adjustment. Daily maintenance should focus on cleaning and lubrication, applying light machine oil to extend lifespan and prevent jams that could affect riding safety.