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What are the reasons for the motorcycle front brake not rebounding?

2 Answers

OJoshua

07/24/25 3:56am

Motorcycle front brake not rebounding is due to rust on the brake rocker arm shaft, rust on the brake cable, excessive wear of the brake shoes, damage to the brake wire, deformation or jamming of the brake pedal or handlebar, excessive sediment or deformation in the brake pump, etc. Related motorcycle content is as follows: Introduction: A motorcycle consists of five parts: the engine, transmission system, walking system, braking system, and electrical instrumentation equipment. It is divided into street bikes, road racing motorcycles, off-road motorcycles, cruisers, and touring bikes, etc. Classification: Road motorcycles can be divided into three categories: super sports motorcycles, touring motorcycles, and American-style motorcycles. When braking, if the brake has force, it may not return to its original position or feel loose. Simply put, the pump piston does not operate. It is best for the brake pump piston not to return to its original position.

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VonNevaeh

08/10/25 11:31pm

Last time I repaired my motorcycle, I encountered a similar issue. The front brake lever wouldn't spring back after being squeezed, which was actually caused by the caliper piston being stuck due to rust and mud. After riding in the rain, I didn't wash it promptly, allowing muddy water to seep into the gap between the caliper and brake pads. Once dried, it turned into sticky grime. Additionally, aging and swelling of the brake hose can cause this too. Over time, the inner rubber layer of the rubber hose can peel off, obstructing brake fluid return like a clogged blood vessel. Another possibility is a blocked return port in the master cylinder—if you disassemble it, you can see the small hole clogged with oil sludge. The most dangerous scenario is when brake fluid absorbs moisture and deteriorates, forming vapor locks in the lines due to vaporization under high temperatures. For emergency treatment, try spraying WD40 into the caliper piston gap and repeatedly squeezing the brake lever to flush out debris. However, it's best to have a professional mechanic disassemble and clean the entire braking system, and replace it with fresh DOT4 fluid while at it.

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