Tires on cars, bicycles and motorcycles have a valve that controls the flow of air in and out. If you need to deflate a tire a little or completely, read this article.
Steps
Method 1 of 2: Deflating a Car Tire

Step 1. Locate the valve
It is usually found between the rims, near the center of the tire, and is about 1 or 2 cm long. It is common for the valve to have a black or metallic cap on the tip.
The cap serves to prevent dust from accumulating on the valve

Step 2. Rotate the cap counterclockwise to remove it
You will see the metal part of the valve (a round hole with a pin in the center).
After removing the cap, place it in a plastic bag so you don't lose it. She is very small

Step 3. Check tire pressure
Fit a pressure gauge to the valve and read the pressure, which will be displayed on the screen in PSI, or pound force per square inch. To find out what is the proper pressure for your vehicle's tires, refer to the instruction manual.
The gauge can be purchased on the Internet and at automotive stores

Step 4. Press the tip of a screwdriver onto the metal pin
The pin is in the center of the valve. If you don't have a screwdriver, use pliers or other small tool. Air will start to exit the valve when you press the pin.
Remove the screwdriver so that the air stops coming out

Step 5. If you want to fully deflate the tires, raise the car
If you try to empty them with the car on the ground, you will end up damaging the wheels and tires. Find the fulcrum on the side of the vehicle and use the jack to lift it. With the car raised, it is safe to deflate the tires.
If you are unsure how to lift your car model, consult the instruction manual

Step 6. Unscrew the metal pin to deflate the tire even more quickly
Using a 12 cm long thin pliers, turn the pin counterclockwise. With this method, the tire will deflate even faster than if you had just pressed the pin.
- Put the pin in a plastic bag so you don't lose it.
- Remember to put it back in the valve after service is complete.
Method 2 of 2: Deflating a Bicycle Tire

Step 1. Loosen the valve cap
The valve is a small 1 or 2 cm bulge protruding from the tire. At the end of it, you'll see a cylindrical lid. Rotate it counterclockwise so that it is slack, but do not remove it completely.

Step 2. Fit the pump tip to the tire
Typically, the inside of the tire shows the proper calibration in PSI (pound force per square inch). Press the hose end onto the valve tip. Toggle the pump handle position and see the pressure shown on the gauge. If the tire has more air than recommended, you will need to deflate it a little.

Step 3. Remove the pump from the valve so that the tire starts to deflate
If it is necessary to deflate the tire a little, unlock the pump and remove it from above the valve.

Step 4. Press the valve tip to deflate the tire
Depressing the loosened cap will release air from inside the tire. You will feel and hear the air coming out as you do this.

Step 5. Force the tire against the ground so that the air comes out more quickly
To deflate the tire even faster, place it on the ground and press it so that the air is expelled.