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How To Use Tire Pressure Gauge
To properly use a tire pressure gauge, first locate the manufacturer’s recommended PSI on the sticker inside your driver’s side door jamb. To use the tire pressure gauge correctly, the first step is to find the “standard answer” of your car-that is, the manufacturer’s recommended tire pressure value on the driver’s door frame sticker. After unscrewing the valve cap, put it directly into your pocket. Then, press the head of the tire pressure gauge vertically and firmly on the valve; when you first touch it, you will hear the sound of “popping” air leakage. At this time, don’t relax, but push harder until the sound is completely gone, forming a tight airtight seal. Hold it steady for a second or two, take it down and read it. If you are using the old-fashioned pen tire pressure gauge (Stick gauge), remember to look at the scale line flush with the metal base of the tool. Finally, compare this number with the recommended value, and tighten the valve cap back after the event.
This video demonstrates how to use a tire pressure gauge:
Operation Details Disassembly
Step 1: Find The Correct PSI Value
Before you touch the tire, you need to know what the target value is. The manufacturer’s recommended PSI (pounds per square inch) is on the sticker on the inside of the driver’s door frame.
Why emphasize this? Because eight out of ten car owners habitually read the small print on the side of the tire. The side of the tire is printed with the maximum air pressure that this tire can withstand, not the best air pressure when your car is driving. Cheer up according to the maximum value, not only will you doubt your life, but you will also have a flat tire.
Confirmation method: Open the driver’s door and look for the yellow or white rectangular label. Note that the recommended values for the front and rear wheels are sometimes different.
Step 2: Fix The Valve Cap
Be careful when you unscrew that little plastic cap, it’s too easy to lose, especially on bad light or gravel roads.
Pocket law: form a good habit, unscrew it and put it directly in your pocket. If you lose this hat, the valve will be exposed to muddy water, and the valve core will be damaged over time, which will lead to slow gas release.
Cleaning check: Before putting the tire pressure gauge up, glance at the valve slightly to make sure there is no mud blocking the opening.
Step 3: Make A Perfect “Hermetic Seal”
This is the most critical step in using a tire pressure gauge, and it is also a bad place for most people. The connection between the tire pressure gauge and the valve directly determines the reading accuracy.
The angle should be positive: the head of the tire pressure gauge must be pressed vertically on the valve. If you press it sideways, the gas will all run outside and you won’t be able to get into the inside and outside.
About the sound of air leakage: it is normal to hear the sound of “boom” at the moment of contact. At this time, many people will subconsciously shrink back, and the mistake is here. You can’t stop, but you have to increase the pressure.
Quiet: Your goal is to go through the “boom” stage until the sound disappears completely. Once it is quiet, it means that the internal rubber sealing ring and the metal valve fit perfectly. At this time, the air pressure in the tire is actually entering the measuring tool.
Step 4: How To Read The Pen Tire Pressure Gauge
Although the pen tire pressure gauge looks old-fashioned, it is the most durable in the toolbox. However, if you don’t know the trick, the readings can easily be misread.
Action: Once the airtight seal is formed, the white plastic scale inside will pop out with a “bang.”
Reading line: Take the watch off the tire and read it. Don’t look at the top of the plastic ruler. What you want to see is the scale line that is just flush with the bottom of the metal shell of the tool. This line represents your current PSI.
Step 5: Final Comparison And Ending
After getting the reading, compare it with the number on the door frame in the first step.
Check: If the values are the same, then it is finished. If it is low, it will replenish its qi; if it is high, it will deflate.
End: Tighten the valve cap immediately after the event. This is to seal the system and also to protect the mechanical structure inside, which is convenient for your next inspection.
Frequently Asked Questions
A: Hearing the sound of “boom” indicates that the gas is running out and not in the surface. This is usually because you are not pressing tightly enough, or the angle is crooked. The solution is simple: straighten the angle, align the valve vertically, and then press hard until you can’t hear the sound.
A: Always subject to the recommended PSI on the sticker inside the driver’s seat door frame. Don’t use the number molded on the side of the tire. Again, that is the limit that the tire can withstand, not the pressure that allows you to drive at ordinary times.
A: On the standard pen tire pressure gauge, there are scale marks on the plastic rod. The correct reading is the line exactly at the edge of the metal case. Don’t rely on guessing, and don’t look at the head of the pole.
Q: Do I have to press the meter on the tire all the time when reading?
A: No need. After the standard pen tire pressure gauge is measured, the scale rod will keep popping out. You can take it off the valve and look closely so that the reading is more accurate.
Author： Mark Stevens
“With over 19 years as a certified automotive mechanic, I specialize in simplifying DIY car maintenance for everyday drivers. I wrote this guide to help you master the essential skill of checking tire pressure, ensuring your safety and extending the life of your tires through precise, accurate readings.”