Brake system faulty: Need to perform diagnose at workshop to solve the problem
1. Check the water content level in brake fluid, replace if the water content is higher than standard: replace brake fluid periodically.
2. Check the brake fluid grading, replace if not meeting standard requirement.
3. Check if there is air in brake fluid hose, perform brake fluid bleeding.
4. Check the disc rotor and brake pad if it is working properly: replace the disc rotor and brake pad.
5. Check if the brake fluid hose is broken, replace the broken unit.