Disc Thickness Variation (DTV): a workshop guide
A practical introduction to disc thickness variation, the information worth recording, and how to start an appropriate workshop enquiry.
Published by Brake Lathes UK Ltd • Updated 13 August 2026
What DTV describes
Disc thickness variation, often shortened to DTV, describes a difference in thickness around a brake disc. It is a condition to assess as part of the wider brake and hub context rather than a diagnosis made from a symptom alone.
Useful information before an enquiry
A clear description helps a workshop understand the next conversation. It is useful to note when the vibration is noticed, which vehicle is involved, and whether the concern is from a driver, service adviser or technician.
- Vehicle make, model and registration details where appropriate
- When the vibration or judder is experienced
- Any recent brake, wheel or hub work
- Whether the enquiry is for a driver service, workshop support or equipment discussion
What happens next
A suitable next step depends on a physical assessment, disc condition and the vehicle manufacturer’s requirements. Brake Lathes UK can route a local service, trade support or equipment enquiry to the relevant conversation.