AutoAudit buyer research · Reviewed
Steering, suspension and braking symptoms
Where and when a vibration or knock occurs helps direct an inspection. Braking, steering and suspension affect control, so changes deserve careful attention.
Braking-only or present while cruising?
A steering shake while cruising may start with a wheel or tyre inspection. Vibration only when braking directs attention to the brakes and components locating the wheel. A knock over bumps may involve a joint, spring or something loose nearby. These distinctions choose tests; they do not diagnose a part from a noise.
References: RAC: suspension symptoms and inspection; AA patrol guidance: car juddering
Put the symptom in context
A registration check can show available MOT history and recorded advisories. It does not diagnose the cause of a current fault.
Know when to stop the test drive
Poor braking, sudden severe vibration, looseness or loss of directional stability warrants stopping safely and arranging assessment. Do not increase speed to reproduce a fault or crawl under an unsupported car. Springs and loaded suspension components store energy and are not appropriate for an improvised viewing inspection.
References: DVSA MOT manual: brakes; DVSA MOT manual: axles, wheels, tyres and suspension
Connect the current finding to the records
Ask the garage to identify the side and component, then compare it with previous MOT notes and invoices. A repeated note on the opposite side is not necessarily the same failed repair. A current inspection can distinguish designed bush movement from wear and cosmetic rim marks from structural damage. Vehicle history helps frame those questions; it cannot replace the inspection.
References: DVSA MOT manual: steering; DVSA MOT manual: axles, wheels, tyres and suspension
Choose the symptom you are seeing
Car juddering when braking: checks and urgency
Braking judder needs a brake and chassis assessment. Disc condition is one possibility, but vibration alone does not prove the discs are warped.
Steering wheel vibration: speed, braking and road clues
A shaking steering wheel can involve tyres, wheels, brakes or worn joints. Whether it happens while cruising or braking changes the investigation.
Suspension knocking over bumps: how to investigate
A knock over bumps can come from several joints, bushes or mountings. Loose luggage or an exhaust component can also imitate a suspension noise.
Put the symptom in context
A registration check can show available MOT history and recorded advisories. It does not diagnose the cause of a current fault.
Sources and applicability
Reviewed on 2026-10-02. Manufacturer instructions must match the vehicle, model year and market. Campaign eligibility needs an individual manufacturer check. Sources below support the relevant sections; they are not evidence that every possible concern occurs on every vehicle.