How To Check Brake Discs
Worn or uneven discs cause vibration, noise and longer stops. Some signs are easy to spot without taking the wheel off.
DifficultyEasy
TimeAbout 10 minutes
AreaBrakes
What you need
- TorchTo see the disc surface.
Step by step
- Look at the disc surfaceIt should be smooth and evenly shiny. Deep grooves or a rough surface mean wear.
- Feel the edge (only when cold)A raised lip at the outer edge shows how much material has worn away.Discs get very hot. Only touch them after the car has stood for a long time.
- Look for blue patches or cracksThese are signs of overheating.
- Notice how braking feelsA pulsing pedal or a shaking steering wheel when braking often comes from uneven discs.
When to go to a workshop
Go to a workshop if you feel vibration when braking, see deep grooves or cracks, or hear grinding. Disc thickness must be measured against the minimum stamped on the disc.
Questions about How To Check Brake Discs
Is light rust normal?
Yes, a thin rust film after rain or washing is normal and disappears after a few stops.
Are discs replaced in pairs?
Yes, on the same axle.