Rapid Air Loss: Emergency Steps to Stay Safe

How to recognize rapid air loss

Rapid air loss can happen suddenly from a puncture, a blowout, or a damaged sidewall. You may feel the steering wheel pull to one side, notice a thumping or vibration, or hear a loud noise. The vehicle may also feel unstable. If your vehicle is equipped with a tire pressure monitoring system (TPMS), it will illuminate a low tire pressure warning telltale when the inflation pressure in one or more tires falls to 25 percent or more below the recommended cold inflation pressure, as specified by Federal Motor Vehicle Safety Standard 571.138. That warning can appear within 20 minutes of the pressure drop, so respond as soon as you see it.

A sudden loss of pressure can affect vehicle handling. The tire may come off the rim if it deflates completely, so it is critical to react quickly but smoothly. Do not slam on the brakes, which can cause the vehicle to skid or spin. Instead, focus on maintaining control and finding a safe place to stop. Remember that a severe loss of pressure can also lead to a blowout, so be prepared for any sudden noise or jolt.

• Warning signs of rapid air loss include: a pulling sensation, thumping or vibration, a sudden drop in ride height, and a TPMS warning.
• If you notice any of these signs, do not ignore them. The longer you wait, the harder it becomes to control the vehicle.

Immediate actions after a sudden pressure drop

Stay calm and grip the steering wheel firmly with both hands. Keep the vehicle pointed straight ahead and ease off the accelerator. Avoid hard braking; instead, let the vehicle slow gradually by removing your foot from the gas. If you must brake, apply the brakes gently and progressively. Do not jerk the steering wheel. Turn on your hazard lights immediately to alert other drivers.

If you are on a highway, do not stop in the travel lane. Look for a breakdown lane, emergency pull-off, or wide shoulder. If you cannot reach a designated stopping area, use the nearest exit or pull onto the shoulder as far away from traffic as possible. Remember that your primary goal is to get out of the flow of vehicles without losing control.

If you have passengers, instruct them to remain calm and keep their seatbelts fastened. Do not attempt to inspect the tire while the vehicle is still moving. Wait until you are fully stopped and parked.

• Do: grip the wheel, ease off the gas, signal, and steer gradually.
• Don't: brake hard, jerk the wheel, change lanes abruptly, or panic.

Steering to a safe stop

Look for a flat, level area off the roadway. Use your turn signals and check mirrors before changing lanes. If you are on a highway, move to the shoulder if it is wide and firm. Avoid soft ground, gravel, or a slope that could make changing a tire dangerous. Once you have reached a safe area, bring the vehicle to a complete stop, apply the parking brake, and keep the hazard lights on.

If you need to change lanes, do so gradually after checking your blind spot. Do not cross multiple lanes at once. The goal is to get out of traffic without losing control. If there is no safe place immediately, continue driving slowly with hazard lights on until you find one, but never drive at speed on a flat tire. Driving on a flat tire can cause permanent damage to the wheel and tire, and may lead to a loss of control.

If you are on a curved road, try to stop on the straight section, if possible. Also be aware of oncoming traffic if you are on a two-lane road. Always place safety first, even if it means a bit more driving at low speed.

• When stopping, ensure the vehicle is on level ground and away from traffic.
• If you have reflective triangles or flares, place them behind your vehicle to alert other drivers.

What to do after stopping

After stopping, assess the situation. If you have a spare tire and the facilities to change it safely, refer to the vehicle owner's manual. If the tire is completely flat or damaged beyond repair, do not drive on it. Call for road assistance if you are not confident in changing the tire yourself. Never stand behind a vehicle on the roadside, and use warning triangles or flares if allowed.

Inspect the tire for visible punctures, cuts, bulges, or sidewall cracks. If the tire has lost all pressure, it likely needs to be replaced, especially if you drove on it while flat. Consult our guide on tire repair versus replacement to decide the next step.

If you are waiting for assistance, stay inside the vehicle with your seatbelt fastened, if possible, especially on busy roads. Keep your hazard lights on and consider using your horn if you see an approaching vehicle that appears out of control. Do not attempt to change the tire on the shoulder if it is too narrow or if traffic is passing too closely.

Preventing rapid air loss and preparing for emergencies

Regular tire maintenance reduces the risk of sudden pressure loss. Check tire pressure monthly and before long trips, using the vehicle manufacturer's recommended cold inflation pressure found in the driver's door jamb or owner's manual, not the maximum pressure printed on the sidewall. Under-inflated tires can overheat and fail, and they also reduce fuel economy. Properly inflated tires last longer and are safer in emergency situations. According to the U.S. Department of Energy, keeping tires properly inflated can improve gas mileage by 0.6% on average, up to 3% in some cases.

Inspect tires for cuts, bulges, or embedded objects. Replace tires that have worn past the treadwear indicators, have sidewall cracks, or show signs of separation. Consider run-flat tires if you want the ability to drive a limited distance after a pressure loss, but remember they still require immediate attention and replacement.

Also consider carrying a tire repair kit, a portable air compressor, and a flashlight. Familiarize yourself with your vehicle's jack and spare tire location before you need them. Regular tire rotations and alignments can help extend tire life and prevent uneven wear that may lead to failure. Check the tire's DOT date code to ensure the tires are not too old, as rubber degrades over time.

• Monthly tire pressure checks are essential.
• Regular visual inspections for damage.
• Maintain proper inflation to prevent overheating.
• Replace tires that show signs of excessive wear or age.

What to pick for your use

Questions

How fast can I drive on a run-flat tire after a pressure loss?

Run-flat tires allow you to continue driving at reduced speed for a limited distance, but the exact range depends on the tire manufacturer and the severity of damage. Always inspect the tire and replace it as soon as possible. See our learn article on run-flat tires for more details.

Should I use the spare tire if I have one?

Yes, if you have a spare and know how to change it safely. Temporary spares have speed and distance limitations, so follow the instructions in your owner's manual. Never drive faster than the limit marked on the spare.

What does the TPMS warning light mean?

Under Federal Motor Vehicle Safety Standard 571.138, the TPMS illuminates a low tire pressure telltale when one or more tires is at least 25 percent below the vehicle manufacturer's recommended cold inflation pressure. The light stays on until the pressure is corrected.

Can a sudden pressure loss cause a blowout?

A blowout is one cause of rapid air loss, but not all rapid air loss is a blowout. It can also result from a puncture, a failed valve stem, or a damaged wheel. Learn more about blowout causes.

How can I check for damage after a rapid air loss event?

Inspect the tire for visible damage, including punctures, cuts, bulges, or sidewall cracking. If the tire has lost all pressure, it likely needs to be replaced, especially if you drove on it while flat. Follow the guidance in our tire inspection article.

What should I keep in my car for emergencies?

A tire repair kit, a portable air compressor, a flashlight, reflective triangles, and a properly inflated spare tire are essential. Familiarize yourself with your vehicle's jack and tire-changing tools before you need them. Regular maintenance can help you avoid many emergencies.