How to Solve the Problem of No Oil Coming Out from the Motorcycle Brake Pump?
3 Answers
First, remove the brake master cylinder, disassemble it, carefully inspect and clean it, then refill it with brake fluid. Next, repeatedly squeeze and release the brake lever until bubbles emerge from the bottom of the brake master cylinder. Continue squeezing and releasing the brake until the brake function returns to normal.
I've encountered motorcycle brake pumps not delivering fluid several times, which could be caused by insufficient oil, air in the system, or component aging. The first step is to check the brake fluid reservoir level - if it's too low, you'll need to add new fluid. It's best to use compatible DOT3 or DOT4 fluid and avoid mixing different brands to prevent chemical reactions. Then bleed the system: loosen the small bleeder screw on the pump while an assistant slowly presses the brake lever. You'll see bubbles emerging, indicating air is being released. Tighten the screw and repeat until only clear fluid flows out. If it still doesn't deliver fluid, there might be internal blockage or wear in the pump. Don't force repairs at this point - take it to a professional repair shop immediately, as DIY attempts could damage critical components. Regular maintenance is crucial. I make it a habit to change brake fluid every six months and check system seals. Since brakes are vital for safety, never cut corners when it comes to riding safety.
I remember last year during a long ride when the brakes suddenly failed, and I found the pump wasn't delivering oil, which scared me half to death. The oil reservoir was half empty at the time. I first filled it with new oil, then followed an online tutorial to bleed the brakes—loosening the pump screw, slowly pressing the brake lever, and tightening it once bubbles stopped coming out. I repeated this five times until it finally worked smoothly. Later, I learned a trick: you can bleed the brakes alone by connecting a plastic tube to a bottle, pressing the lever while watching the bubbles disappear. However, for first-timers, it's better to have a helper to avoid oil leaks or improper operation. This experience taught me to always check the brake fluid level before riding and replace the fluid regularly to prevent air from entering. Safety comes first—if something happens while riding, it's too late. Prevention is always better than cure.
