Why does my car make a noise when I brake?

Your brakes are telling you something. Listen before it gets expensive.

The answer in 2 lines. A light squeak on a damp morning that goes after a few stops is usually surface rust on the discs. A high-pitched squeal that comes back every time you brake can be the pad wear indicator: get the brakes checked soon. Grinding or scraping usually means metal on metal: do not drive until the brakes have been checked. If the pedal goes soft or sinks to the floor, the red brake warning light comes on, or the car pulls hard to one side, stop as soon as it is safe and do not drive on. In danger on the road, call 999.

The first 3 steps

Note when the noise happens: from cold, under hard braking, at low speed, when reversing.
Work out where it comes from: front or back, left or right.
Check the dashboard: is a brake or brake pad warning light on? Make sure the handbrake is fully off, as it often shares the same light.

Stop: danger

Soft pedal, pedal sinking to the floor, red brake warning light or a brake fluid warning: stop as soon as you safely can and do not drive on. Arrange for the car to be recovered.
On a motorway or fast road: get to a place of relative safety (a service area, lay-by, emergency area or, as a last resort, the hard shoulder), get out on the side away from traffic if it is safe and keep well away from moving vehicles.
Anyone in danger or the car stuck in a live lane: call 999.

What the noise may mean

What you hear or feel	Possible cause	What to do
Squeak on a damp morning that goes away	Moisture, light surface rust on the discs	Nothing, if it does not come back
High-pitched squeal every time you brake	Pad wear indicator, a stone or dust in the brakes	Get it checked soon
Grinding or scraping metal	Pads worn through, metal touching the disc	Do not drive until checked
Vibration through the pedal or steering wheel	Worn, damaged or warped discs	Get it checked
Car pulls to one side when braking	Sticking calliper or damaged hose (sometimes tyres or alignment)	Get it checked without delay
Knock or clunk when braking	Loose brake or suspension part	Get it checked without delay
Noise just after new pads were fitted	New pads bedding in	Normal for a short while; if not, go back to the garage

What you can check yourself

Look at the discs through the wheel: deep grooves or a pronounced lip at the edge point to wear.
Check the brake fluid level in the reservoir under the bonnet: it should sit between the MIN and MAX marks. If it is low or you see a leak, do not drive.
Do not take anything apart unless you are trained: brakes are a safety system. Leave repairs to a qualified mechanic.

What not to do

Turning up the radio so you no longer hear it.
Spraying grease or lubricant on the discs or pads to stop the squeal: contaminated pads are an MOT failure and brake less well.
Waiting for the next MOT or service.

Why not wait

Pads worn down to the metal damage the discs, so the repair costs more.
Above all, your stopping distance gets longer.
A noise that changes or gets worse over a few days needs to be taken seriously.

What the MOT says about brakes

The official MOT inspection manual, section 1 (brakes) lists what testers look for. Scroll to "brake pads and linings" (1.1.13) and "brake discs and drums" (1.1.14) to see how each fault is graded.

Major: pad worn down to the wear indicator; pad contaminated with oil or grease; disc significantly and obviously worn; brake fluid significantly below the minimum mark.
Dangerous: pad worn below 1.5 mm; pad missing; disc insecure, cracked or likely to fail; no brake fluid visible.
A car with a major or dangerous defect fails. With a dangerous defect, you must not drive it until it is repaired (GOV.UK — MOT test result).
The same MOT applies in Wales and Scotland; Northern Ireland runs its own vehicle testing.

Good to know

Some pads have a small metal tab that squeals on purpose when they are worn: it is a warning, not a fault.
Many modern cars have pad sensors that switch on a dashboard light when the pads need replacing.
Ask for a written quote before any brake work, and ask to see the old parts.

When to get it checked

As soon as a noise comes back every time you brake or turns metallic.
If the car pulls to one side under braking.
If the pedal feels softer, harder or vibrates.
Before a long journey, if you have any doubt.

In Norwich, Daniel has heard a high squeal every time he brakes for ten days, then a faint scraping. He stops driving the car and has it checked: the front pads are almost gone. Replaced in time, the discs do not need changing.

A made-up story, for illustration.

Bobby

Sources, verification, confidence

Verified on 6 November 2026, for England. Confidence: high for the MOT defect categories, the 1.5 mm threshold and the rule on driving with a dangerous defect (GOV.UK, DVSA); high for where to stop after a breakdown (Highway Code, rule 275); medium for the causes of each noise, which are common indications: only a check on the car confirms them. This guide describes common cases, not a diagnosis.