Attach the tire pressure gauge: Press the gauge firmly onto the valve stem to get an accurate reading. You may hear a hissing sound, which is normal. Read the tire pressure: Compare the gauge's tire pressure reading to the recommended PSI for your vehicle. If the pressure is too high or too low, it will need to be adjusted. Adjust tire pressure.. Only inflate your tyres to the maximum numbers shown on the placard. To get an accurate tyre pressure reading check them with a pressure gauge before you drive when they are cold or with the air pump at a nearby service station - only drive a short distance before checking them. Get into the habit of checking tyre pressure every two weeks.
The tyre pressure label may also display the speed rating for each tyre. This rating indicates the maximum speed that the tyre can safely handle. The speed rating of your tyres must be appropriate for your vehicle and the driving conditions. Step 5: Check for any additional information.. How to check tyre pressure at a garage. Most petrol station forecourts have tyre pressure machines - they're usually next to the water filling point and a vacuum cleaner. They can be less accurate than shop-bought gauges, so we'd only use them if you have no other option: Most garage tyre pressure machines cost money to use.