What does it mean when there is a loss of pressure in the rear tire?
2 Answers
If your car displays a warning for a loss of pressure in the right rear tire, it indicates that the tire pressure in the right rear tire is abnormal and requires calibration. Only vehicles equipped with a tire pressure monitoring system (TPMS) will show this alert. TPMS can promptly reflect tire conditions, eliminate potential safety hazards, and extend tire lifespan. There are three commonly used methods for tire pressure monitoring: Direct Tire Pressure Monitoring: Direct TPMS uses pressure sensors installed in each tire to directly measure tire pressure. The pressure data is transmitted wirelessly from inside the tire to a central receiver module, which then displays the pressure readings for each tire. The system automatically alerts the driver if the tire pressure is too low or if there is a leak. Indirect Tire Pressure Monitoring: When the pressure in a tire decreases, the vehicle's weight causes the rolling radius of that tire to become smaller, making it rotate faster than the other wheels. By comparing the differences in rotational speed between the tires, the system monitors tire pressure. Indirect TPMS essentially relies on calculating the rolling radius of the tires to monitor pressure. Tire Pressure Monitoring System (TPMS) Overview: This system combines the advantages of both the direct and indirect systems. It equips direct sensors in two diagonally opposite tires and includes a 4-wheel indirect system. Compared to using only a direct system, this hybrid approach reduces costs and overcomes the limitation of indirect systems, which cannot detect when multiple tires simultaneously have low pressure. However, it still cannot provide real-time pressure data for all four tires as effectively as a full direct system.
After driving for so many years, I've encountered rear tire pressure loss quite often. It's usually due to low tire pressure or a slow leak, which can cause tire deformation, affect braking and steering, and make the ride unstable. What worries me the most is a tire blowout during long trips, especially on highways. There are many possible causes, like a nail puncture, a faulty valve core, or natural pressure drop in cold weather. My advice is to pull over immediately if the warning light comes on or the tire looks flat. Check the pressure by pressing the tire to see if it feels soft, then head to the nearest repair shop to fix or replace the tire. Regular self-checks with a tire pressure gauge can prevent these issues—developing this habit can be a lifesaver in critical moments.
