Squeaking vs grinding — what each sound usually means
Squeak: high-pitched, comes and goes, often disappears once the brakes are warm. Usually surface glazing, brake-dust contamination or the wear indicator just starting to touch the disc — pads are near the end of life but not yet dangerous.
Grind: low, metallic, gets worse the harder you press. The friction material is gone and the steel backing plate is now cutting into the disc. This is unsafe and usually means pads AND discs need replacing.
Common underlying causes
- Worn brake pads (most common)
- Glazed discs from light city use or stuck calipers
- Sticky / seized caliper sliders pulling the car to one side
- Corroded discs after the car has stood unused for weeks
- Wrong-spec or cheap aftermarket pads fitted at the last service
When it becomes unsafe
If you can feel pulsing through the pedal, smell hot metal after a stop, or hear continuous grinding even at low speed — stop driving and book it in. Brake failure under load is sudden, not gradual.
Why brake issues fail the MOT
The tester measures brake imbalance, efficiency and disc condition on a rolling brake-test machine. Pads below 1.5mm, discs more than 25% worn, contaminated friction surfaces or seized calipers are all automatic fails.
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Written & reviewed by
Woodseer Autos Workshop Team
DVSA-authorised MOT testers & mechanics
The Woodseer Autos workshop team are DVSA-authorised MOT testers and qualified mechanics with hands-on experience across all MOT classes (1, 2, 3, 4, 5 & 7). Articles are written and reviewed by the same technicians who carry out the work in our East London workshop.
- DVSA-authorised MOT Testing Station — VTS V106376
- MOT classes 1, 2, 3, 4, 5 & 7
- Independent garage operating from 14 Copenhagen Place, London E14 7DF