What are the signs of RWD problems?

When issues arise in the rear-wheel drive (RWD) system, they are typically accompanied by the following characteristic symptoms: If the brake caliper seizes, brake pads stick, or parking brake cables corrode, the rear wheels may exhibit increased rotational resistance or even complete lock-up, particularly noticeable during cold starts. Worn drive shafts or differential gears may produce metallic knocking sounds or high-frequency vibrations during acceleration, with these abnormal noises intensifying as vehicle speed increases. Differential seal leaks causing inadequate lubrication may generate a burning odor in the rear axle area, accompanied by irregular power delivery. Electronic parking brake malfunctions may trigger persistent warning lights along with abnormal motor operation noises. Regular maintenance should include: brake pad thickness inspection (minimum 3mm), wheel bearing endplay measurement (replace if exceeding 0.05mm), and use of manufacturer-specified GL-5 gear oil for differential service. For electronic parking systems, biennial testing of motor resistance (normal range 3-5Ω) and wiring insulation is recommended. Immediate inspection of brake caliper slide pin lubrication is required if abnormal rear brake drag is detected, to prevent disc overheating and warping.