Key takeaways
- In a blowout, do not brake hard or wrench the wheel — grip the wheel firmly, ease off the accelerator and let the car slow gradually.
- Keep the car straight, signal, and only steer gently towards a safe spot once you are below about 30mph.
- Most blowouts are preventable: under-inflation, worn or aged tyres, overloading and impact damage are the main causes.
- On a motorway, get behind the barrier after stopping and call for help rather than attempting a roadside change.
A blowout is a sudden, complete loss of tyre pressure, often with a loud bang and a violent pull to one side. It is one of the most alarming things that can happen at speed, but drivers who know how to respond can almost always keep control. This guide covers exactly what to do in the moment, what to do afterwards, and how to prevent one.
What should you do during a tyre blowout?
Hold the steering wheel firmly with both hands, keep the car pointing straight, and ease off the accelerator gradually — do not slam the brakes or jerk the wheel. Let the car slow down on its own, switch on your hazard lights, and only steer gently towards the verge or hard shoulder once your speed has dropped to a safe level.
The instinct to brake hard is the dangerous one. With one tyre gone, sudden braking unbalances the car and can send it into a spin. A smooth, gradual slowdown lets the three good tyres do their work.
It helps to know what to expect before it ever happens, because a blowout gives you very little thinking time. The car will try to pull towards the failed tyre, and the steering may feel suddenly heavy or vague. Rehearsing the response — hold firm, ease off, no harsh braking — makes you far more likely to react correctly under pressure.
- Grip the wheel firmly with both hands and keep the car straight.
- Take your foot off the accelerator — do not brake hard.
- Let the car slow naturally; correct any pull gently.
- Switch on hazard lights to warn other drivers.
- Once below about 30mph, steer gently to a safe, level spot and stop.
What to do after a blowout
Once stopped safely, put on the handbrake, keep your hazards on, and get everyone out of the car on the side away from traffic. Assess where you are: if you are anywhere near fast-moving traffic, do not attempt a wheel change. A blowout usually destroys the tyre, so a repair is rarely possible and you will need a replacement.
- Apply the handbrake and leave hazard lights on.
- Get all occupants out and well clear of traffic.
- Place a warning triangle only if it is safe to do so.
- Decide whether to fit your spare or call for help.
If conditions are safe and you have a usable spare, our guide to changing a tyre safely walks you through it. If you have no spare, see what to do without a spare.
It is also worth a quick look at the other tyres and the wheel arch. A blowout can throw debris and damage bodywork, and if the cause was an impact or a load problem, the matching tyre on the same axle may be suffering too. Mention anything you notice to the fitter so they can check the whole corner of the car, not just the failed tyre.
What causes a tyre blowout?
Most blowouts are preventable and trace back to a tyre that was already weakened. The leading causes are persistent under-inflation, worn or aged rubber, overloading the vehicle, and impact damage from potholes or kerbs. Heat is the common thread: each of these makes a tyre run hotter until the structure suddenly fails.
Under-inflation is the biggest single culprit. A soft tyre flexes far more as it rolls, and that constant flexing generates heat deep inside the carcass. Over a long, fast journey — particularly when the car is fully loaded — that heat can build until the rubber and the internal plies separate, which is the moment a blowout occurs. The tyre often looks fine right up until it fails.
How to prevent a tyre blowout
The single best defence is correct tyre pressure, checked at least monthly and before long trips. TyreSafe highlights under-inflation as a major cause of tyre failure, because a soft tyre flexes more and overheats. Combine pressure checks with regular tread and damage inspections, and replace tyres before they get too old or worn.
Pay particular attention before any heavily loaded journey, such as a family holiday with a full boot. Most cars have a higher recommended pressure for full loads, printed in the handbook or on the sticker inside the driver's door. Setting your tyres to that higher figure when carrying weight is one of the simplest ways to keep them cool and cut the blowout risk on a long motorway run.
- Check pressures monthly and before long or loaded journeys, when cold.
- Inspect for damage — bulges, cracks, cuts and embedded objects.
- Watch tyre age — old rubber hardens and cracks even with tread left.
- Do not overload — stay within the load rating, especially towing.
- Slow for potholes and avoid kerbing the wheels.
Getting help after a blowout
A blowout almost always means a new tyre, and on a fast road it means calling for help rather than working at the kerbside. Once you are somewhere safe, Fast Tyre can come to you 24/7 across London and central England. Our emergency callout team usually arrives within 30–60 minutes to fit a replacement on the spot, so you are not left stranded.
Frequently asked questions
No — braking hard during a blowout can unbalance the car and cause a spin. Instead, grip the wheel firmly, keep the car straight and ease off the accelerator so it slows gradually. Only once your speed has dropped to a safe level should you steer gently off the road.
Usually a loud bang followed by a strong pull towards the side of the failed tyre, a sudden loss of grip and a flapping or thumping noise. The car may feel like it is dragging or veering. Stay calm, hold the wheel firmly and avoid sudden inputs.
Almost never. A blowout destroys the tyre structure, shredding the sidewall and inner liner, so it falls well outside the repairable area under BS AU 159. You will need a replacement. The wheel should also be checked for damage before the new tyre is fitted.
Both are serious, but a front blowout affects steering directly and is often harder to control, while a rear blowout can cause the back of the car to sway. The response is the same for both: no hard braking, hold the wheel and slow gradually.
Keep tyres at the correct pressure, check them monthly and before long trips, inspect for cuts and bulges, avoid overloading, and replace tyres that are old or worn. Under-inflation is a leading cause, so a quick pressure check is the most valuable habit.