Steering-wheel vibration: speed, braking or road?
方向盘振动：车速、制动还是路面？
Record repeatable symptoms and identify when the car should stop rather than continue.
记录可重复现象，并判断何时应立即停驶。
Beginner diagnosis · 10 min · Tyre gauge, phone notes
1. Stop for sudden severe vibration
Slow smoothly and stop if vibration starts after an impact, with a low tyre, banging, pulling or warning light.
突然剧烈振动立即停车
撞击后突发振动、轮胎缺气、敲击、跑偏或警告灯同时出现时，应平稳减速停车。
2. Inspect tyres before testing
Check cold pressure, tread, bulges, cuts, missing wheel nuts and packed mud. Do not road-test a visibly damaged tyre.
试车前先看轮胎
检查冷胎压、花纹、鼓包、割伤、缺失螺母与附着泥块，轮胎肉眼损坏时不要试车。
3. Record the trigger precisely
Note the speed range, whether it changes under braking or acceleration, and whether the seat or steering wheel shakes more.
准确记录触发条件
记录发生车速、制动或加速时是否变化，以及座椅还是方向盘振动更强。
4. Request targeted inspection
Ask for tyre balance, wheel/rim, alignment, suspension and brake inspection based on the trigger. Do not accept balancing as proof every fault is solved.
要求针对性检查
根据触发条件检查动平衡、轮圈、定位、悬挂与制动，不要把“做过动平衡”当作所有问题已解决。