Brake problems: squeaking, grinding, judder or a soft pedal
With brakes it's always worth erring on the side of caution, so every brake symptom here gets at least an amber verdict. Some are warnings with time to spare — many pads have a built-in wear indicator designed to squeal. Others mean stop now: grinding, a soft or sinking pedal, or a pedal that suddenly needs far more effort.
Pick what you're noticing below for the likely causes, ranked, and what to do next.
Free interactive diagnosis
What do you notice?
Is it safe to keep driving?
For a typical car with each symptom. These are general guidance, not a diagnosis — if you're unsure, don't drive it.
- Squeaking or squealing brakesDrive carefully
- Grinding noise when brakingDon't drive
- Car shudders or judders when brakingDrive carefully
- Car pulls to one side when brakingDrive carefully
- Spongy or soft brake pedalDon't drive
- Hard brake pedalDon't drive
- Handbrake weak or not holdingDrive carefully
Squeaking or squealing brakes
Drive carefully — book it in
You can drive gently, but get it looked at within days rather than weeks. Left alone it will get worse, less safe or more expensive.
Likely causes
- Worn brake padsMost likely
A squeal when braking, a pad-wear warning light, or less than 3mm of pad material left. Grinding means they're down to the metal.
If it's this: get it checked soon.
- Worn, corroded or warped brake discsLikely
A pulsing pedal or a shaking steering wheel when braking, and a raised lip around the edge of the disc.
If it's this: get it checked soon.
- Sticking brake caliper or slider pinsPossible
The car pulls to one side, one wheel is much hotter than the others after a drive, and there's a burning smell.
If it's this: get it checked soon.
What to do next
Many pads have a metal tab that squeals when they're nearly worn — it's a reminder, not an emergency. Book it in within days.
Grinding noise when braking
Stop — don't drive it
If you're driving, pull over when it's safe and switch off. Don't drive it again until it's been checked — have it recovered if you need to. Carrying on risks the engine, your brakes or your steering, and recovery costs less than the damage.
Likely causes
- Worn brake padsMost likely
A squeal when braking, a pad-wear warning light, or less than 3mm of pad material left. Grinding means they're down to the metal.
If it's this: get it checked soon.
- Worn, corroded or warped brake discsLikely
A pulsing pedal or a shaking steering wheel when braking, and a raised lip around the edge of the disc.
If it's this: get it checked soon.
What to do next
Grinding usually means the pads are worn to the metal, which cuts braking and destroys the discs. This is brakes-today territory, not next month.
Car shudders or judders when braking
Drive carefully — book it in
You can drive gently, but get it looked at within days rather than weeks. Left alone it will get worse, less safe or more expensive.
Likely causes
- Worn, corroded or warped brake discsMost likely
A pulsing pedal or a shaking steering wheel when braking, and a raised lip around the edge of the disc.
If it's this: get it checked soon.
- Sticking brake caliper or slider pinsPossible
The car pulls to one side, one wheel is much hotter than the others after a drive, and there's a burning smell.
If it's this: get it checked soon.
- Worn suspension arm bushesPossible
A clunk when braking or pulling away, and steering that wanders at speed.
If it's this: get it checked soon.
- Worn track rod endPossible
A knock through the steering wheel, and play when a front wheel is rocked side to side (hands at 3 and 9 o'clock) with the car jacked up.
If it's this: get it checked soon.
What to do next
Usually warped or worn discs. Usually fine to drive gently to a garage, but get it checked within days.
Car pulls to one side when braking
Drive carefully — book it in
You can drive gently, but get it looked at within days rather than weeks. Left alone it will get worse, less safe or more expensive.
Likely causes
- Sticking brake caliper or slider pinsMost likely
The car pulls to one side, one wheel is much hotter than the others after a drive, and there's a burning smell.
If it's this: get it checked soon.
- Worn suspension arm bushesLikely
A clunk when braking or pulling away, and steering that wanders at speed.
If it's this: get it checked soon.
- Leaking brake hose or corroded brake pipePossible
A spongy pedal, the brake fluid level dropping, and a wet patch on the inside of a wheel.
If it's this: don't drive.
- Damaged or under-inflated tyrePossible
Check the pressures, and look for a bulge on the sidewall or a nail in the tread. A bulge means the tyre can fail — replace it before driving at speed.
If it's this: get it checked soon.
What to do next
After a short drive, carefully hold your hand near each wheel (don't touch) — one much hotter than the others is a sticking caliper.
Spongy or soft brake pedal
Stop — don't drive it
If you're driving, pull over when it's safe and switch off. Don't drive it again until it's been checked — have it recovered if you need to. Carrying on risks the engine, your brakes or your steering, and recovery costs less than the damage.
Likely causes
- Leaking brake hose or corroded brake pipeMost likely
A spongy pedal, the brake fluid level dropping, and a wet patch on the inside of a wheel.
If it's this: don't drive.
- Old brake fluid that has absorbed waterLikely
A pedal that goes soft after hard braking, and dark fluid in the reservoir. A garage can test it with a meter in a minute.
If it's this: get it checked soon.
- Worn brake padsPossible
A squeal when braking, a pad-wear warning light, or less than 3mm of pad material left. Grinding means they're down to the metal.
If it's this: get it checked soon.
What to do next
Don't drive it. A soft or sinking pedal means air or a leak in the brake system, and it can fail completely.
Hard brake pedal
Stop — don't drive it
If you're driving, pull over when it's safe and switch off. Don't drive it again until it's been checked — have it recovered if you need to. Carrying on risks the engine, your brakes or your steering, and recovery costs less than the damage.
Likely causes
- Brake servo or vacuum pumpMost likely
The pedal is hard and the car needs far more effort to stop. With the engine off, press the pedal a few times, hold it down and start the engine — it should sink slightly. If it doesn't, the servo isn't getting vacuum.
If it's this: don't drive.
- Leaking brake hose or corroded brake pipePossible
A spongy pedal, the brake fluid level dropping, and a wet patch on the inside of a wheel.
If it's this: don't drive.
What to do next
Don't drive it. A hard pedal means you've lost brake assistance — the car still stops, but only with far more force than you'd expect in an emergency.
Handbrake weak or not holding
Drive carefully — book it in
You can drive gently, but get it looked at within days rather than weeks. Left alone it will get worse, less safe or more expensive.
Likely causes
- Handbrake cable or electronic parking brakeMost likely
The lever pulls up further than it used to, the car rolls on a slope, or an EPB fault light is on.
If it's this: get it checked soon.
- Worn brake padsLikely
A squeal when braking, a pad-wear warning light, or less than 3mm of pad material left. Grinding means they're down to the metal.
If it's this: get it checked soon.
- Sticking brake caliper or slider pinsPossible
The car pulls to one side, one wheel is much hotter than the others after a drive, and there's a burning smell.
If it's this: get it checked soon.
What to do next
Park in gear (or in P) with the wheels turned into the kerb until it's fixed. A weak handbrake is also an MOT failure.
A shortlist, not a diagnosis
The ranking is the one a mechanic would give over the counter for a typical car — nobody can road-test a car over the internet, and the real cause may not be listed. Add the registration in the checker above to have it checked against that car's MOT advisories, mileage and engine. Have the car checked by a qualified mechanic before relying on it, and if you're unsure whether it's safe, don't drive it.
Common questions
Why are my brakes squeaking?
Most often the pads are worn down to their wear indicator, a small metal tab designed to squeal. A squeak first thing in the morning that goes after a few stops is usually surface rust on the discs and is harmless. Squealing that carries on should be checked within days.
Is it safe to drive with grinding brakes?
No. Grinding usually means the pad material has gone and metal is rubbing on the disc, which cuts braking and damages the discs quickly. Don't drive it until it's been checked.
Why does my car shake when I brake?
Usually unevenly worn or warped front discs, felt as a judder through the steering wheel or the pedal. A sticking caliper or worn suspension bushes can do it too. It isn't an emergency, but get it looked at within days.
What does a spongy brake pedal mean?
Air or a leak in the hydraulic system, or old brake fluid that has absorbed water. It's a stop-now symptom: the pedal can sink to the floor without warning.
Related symptoms
Steering & vibration
Steering problems: pulling, shaking, heavy or vague steering
Other warning lights
Dashboard warning light on? What it means and what to do
Noises
Strange noise from your car? Find what's making it
All symptoms: Engine management light · Other warning lights · Won't start · Exhaust smoke · Running poorly · Leaks · Steering & vibration · Noises · Symptom checker