Air in the brake lines will cause a soft or spongy brake pedal. Also, old
brake fluid that has a lot of absorbed moisture will degrade braking performance.
To get rid of the old brake fluid and any air in the brake lines, you'll need
to bleed the brake system.
FC3S Pro: Problems, Components - Brakes, How to Bleed
When selecting new brake fluid, ensure you're using the proper brake fluid for your FC3S.
FC3S Pro: Problems, Components - Brake Fluid
Inspect all the brake lines and fittings for leaks.
FC3S Pro: Problems, Components - Brake Lines
If the brake master cylinder hasn't been changed, it might be a good idea to
change it now. A bad brake master cylinder can cause soft brakes.
FC3S Pro: Problems, Components - Brake Master Cylinder
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