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What Causes Loss of Pressure in a Motorcycle Brake Master Cylinder?

2 Answers

PenelopeLynn

08/28/25 3:02am

Loss of pressure in a motorcycle brake master cylinder may be caused by the following reasons: 1. Damaged fuel pump: Many pumps have substandard quality or design flaws, requiring complete replacement. 2. Faulty fuel pump control unit. 3. Burned-out wiring related to the fuel pump. 4. Clogged coarse filter screen at the fuel pump intake: Clean the coarse filter screen promptly in this case. 5. Blocked fuel tank ventilation. 6. Air trapped in the brake master cylinder, which needs bleeding. 7. Improperly installed brake pads, requiring reinstallation. 8. Oil or air leakage in the brake master cylinder.

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DelFaith

09/09/25 8:25am

I often encounter this issue when riding motorcycles. If the brake master cylinder has no pressure, it's mostly due to insufficient brake fluid or air in the system. First, check the fluid level in the reservoir. If it's below the minimum line, add new fluid. After topping up, you must bleed the system; otherwise, the lever will still feel spongy. Bleeding requires two people to cooperate: one operates the lever while the other loosens and tightens the bleeder screw at the caliper. Additionally, air may enter from a poorly sealed master cylinder piston, which can leak when worn. If there are signs of fluid leakage around the reservoir, it means the seals need replacing. If the motorcycle sits unused for a long time, the brake fluid can absorb moisture and degrade, lowering its boiling point and affecting pressure transmission. It's recommended to change the fluid every two years to ensure safety. Riding without brakes is extremely dangerous. If you notice any issues, stop using the bike immediately and have it inspected by a professional to prevent further damage.

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