Common brake system issues mainly include abnormal brake discs, brake failure, abnormal noises, and performance degradation. Excessive wear of brake discs may result in bluish-purple burn marks or cracks, leading to reduced braking efficiency or complete failure. Brake failure is often caused by insufficient brake fluid or a faulty master cylinder seal, presenting as increased pedal travel or loss of feedback. Immediate inspection for fluid leaks and replenishment with DOT3/DOT4 specification brake fluid is required. Abnormal noises typically stem from severely worn brake pads (producing high-pitched sounds) or warped brake discs (causing low-frequency metallic noises). Brake pads thinner than 3mm or brake discs below 38mm in thickness should be replaced. Performance degradation may result from air in the system (requiring bleeding), deteriorated brake lines (rubber hoses should be replaced every 6 years), or inappropriate brake pad material, manifesting as spongy brakes, steering wheel vibration, or increased stopping distance. Routine maintenance should include brake system inspections every 50,000-60,000 kilometres and annual brake fluid moisture testing (replace if moisture exceeds 3%). Regular maintenance prevents over 90% of potential failures and ensures driving safety.
