Can You Drive with 0.4 bar Tire Pressure?

[GeorgeFitz]

You should not drive with 0.4 bar tire pressure. Modern vehicles are equipped with tire pressure monitoring systems, which typically trigger an alarm when the tire pressure drops below 1.5 bar. It is recommended not to let the pressure fall below this value, as the most severe consequence of low tire pressure is a blowout, which can be extremely dangerous. Hazards of Low Tire Pressure: Increased friction with the road surface, leading to higher fuel consumption; Heavier steering wheel and a tendency to veer off course, compromising driving safety; Excessive movement of tire components, causing abnormal heat buildup due to over-compression; Reduced functionality of the cord and rubber, leading to delamination or cord breakage, as well as excessive friction between the tire and rim, resulting in damage to the bead area and abnormal wear; Multiplied friction between the tire and the ground, causing a rapid rise in tire temperature, softening of the tire, and a sharp drop in strength. High-speed driving under such conditions may lead to a blowout; Increased deformation of the tire body, making the sidewalls prone to cracking. This also induces flexing motion, leading to excessive heat buildup, accelerated rubber aging, fatigue in the cord layers, and cord breakage. Additionally, it enlarges the tire's contact area with the ground, accelerating wear on the tire shoulders.

[Stacy]

To be honest, driving with a tire pressure of only 0.4 bar is absolutely unacceptable. I've seen this situation several times. Once on the road, the car will feel sluggish, with slow steering and a tendency to skid, especially dangerous on curves or highways. Such low tire pressure means the tire is almost flat, and the inner sidewalls will continuously rub and overheat, potentially leading to a blowout and loss of control. Moreover, driving like this for a long time will wear the tires out severely, and if the rims get deformed, it will cost a fortune to repair. It's best to stop immediately and check for the cause, such as a puncture, use a portable pump to temporarily inflate to at least 2.0 bar, then go to a shop for a thorough fix. Make it a habit to check tire pressure weekly, keeping it between 2.0-2.5 bar, and keep a portable inflator at home. Safety is far more important than saving time.

[Olive]

I made a similar mistake before - driving with low tire pressure. Not only did it burn extra fuel, but the tires wore out prematurely, costing me hundreds to replace. A 0.4bar difference means the tire is over one-third deflated, accelerating wear with every kilometer. The increased contact area raises rolling resistance, spiking fuel consumption. Not to mention the safety risks - emergency braking could even cause a rollover. So never drive like this. Find a place to inflate or change to the spare tire. If all else fails, call for roadside assistance. Regularly checking tire conditions saves money and headaches. Don't repeat my mistake of neglecting inspections and incurring unnecessary expenses.

[OManuel]

A tire pressure of 0.4 bar is equivalent to a deflated state. Under such low pressure, the internal structure of the tire is subjected to uneven stress, and excessive bending can cause overheating, damaging the rubber strength of the tire body. Driving under these conditions not only makes the vehicle unstable and the steering wheel heavy but also affects braking performance, increasing stopping distance—posing a risk of rear-end collisions. I often remind my friends that the normal tire pressure for a family car should be around 2.0 bar. Anything below 1.5 bar should raise concerns, let alone 0.4 bar. It's advisable to address this issue immediately: use a simple tire pressure gauge to measure and confirm, then either inflate the tire or replace it. Don't risk driving, as a minor issue could escalate into major repairs.