Causes of a Leaking Schrader Valve and How To Fix It?

You’re enjoying the weekend with your family, driving through the country roads, when suddenly you start noticing that you are losing air pressure.

Within no time, your tires are out of air, leaving you and your loved ones stranded in the middle of nowhere!

Suddenly, the happy outing turns into a harrowing nightmare! Sounds scary, doesn’t it?

In most cases, the culprit is a leaking Schrader valve that causes slow leaks of air from the tires, causing them to lose pressure slowly or rapidly. This eventually results in a flat tire.

But what is a Schrader valve?

What is a Schrader Valve?

A Schrader valve is a component of a pneumatic tire consisting of a valve stem, a spring, and a pin system that allows air to enter the tire and prevent it from escaping, ensuring your car’s tires have the correct pressure.

Schrader Valve

It is the small thing attached to the tires that lets you pump air into the tire tube.

A leaking Schrader valve can cause you to lose air pressure in your tires unexpectedly, which can be dangerous when driving, as we just saw.

But what exactly causes a Schrader valve air leak, and what can you do to fix it? Let’s find out.

What are the Main Causes of a Leaking Schrader Valve

A Schrader can leak due to various reasons. The valve consists of small, different components, which can individually malfunction and result in a leakage.

Here is a look at some things that can go wrong with a Schrader valve.

The O-ring

The O-ring is a vital part of the valve system, and it lies between the rim of the tire and the valve stem.

The O-ring can get damaged due to various reasons or can go missing altogether over time, which can cause air leakage.

Check Valve

Similar to the O-ring, the check valve may get damaged, leading to a leaking Schrader valve.

Valve Core

The core of the Schrader valve, too, can get damaged, which can cause the valve not to close properly and lead to air leakage.

How Can You Detect a Leaking Schrader Valve?

You need first to inflate the tube, then submerge it in water. The presence of air bubbles indicates a leakage.

Leaking Schrader Valve

If the bubble has passed through the valve, then all you need to do is adjust the valve core by tightening it. This will stop the air from leaking.

The presence of a bubble near the valve indicates that the valve stem is leaking at its base.

How Can You Fix a Leaking Schrader Valve?

Every part of your bike has an important role to play in ensuring that your bike functions properly and doesn’t have a flat tire. However, one component that is often overlooked is the Schrader Valve.

Without this small piece of equipment, you wouldn’t be able to inflate your tire.

In fact, this particular part plays a vital role in regulating how much air flows into and out of the tire.

With that being said, here is a brief description of how you can fix a leaking Schrader valve.

Generally, a leaking Schrader valve can be fixed in four easy steps. They are:

Remove the Schrader Core From the Stem

Using a needle or a sharp object, puncture the valve stem to remove the core from the stem and set it aside.

Check the Rubber O-ring and Valve

Inspect the rubber O-ring and valve seat for damage. If either is damaged, replace them with new ones.

Put the New Core

Remove the old removable valve cores and place the new core into the valve stem and screw it in until it is tight.

Test For Leaks

Inflate the tire and check for leaks. If there are none, you have successfully fixed the valve leakage.

Frequently Asked Questions

How Often Do I Need to Check My Tires’ Air Pressure?

Checking the air pressure once a month is enough. More frequent checks are not necessary unless there are signs of damage or wear.

For example, if one side of the tread looks worn down, you might want to check the pressure more frequently.

Do I Need to Replace the O-ring Every Time I Get a Flat Tire?


It depends. If the O-Ring is still in good shape, you can use it again. But if it’s damaged or lost, you’ll need to buy a new one.

My Schrader Valve Leaks and I Can’t Locate Where the Leakage Occurs. What Should I Do?

If you can’t locate the source of the leaking air pressure, it’s best to change the whole Schrader valve. They are relatively inexpensive and easy to install.

What is the Cost of Repair for a Leaking Schrader Valve?

Depending on the severity of the damage, the cost of repair may vary. It will only cost a few dollars if you just need to replace an O-ring or Schrader core.

If you need to replace the whole Schrader valve, it could be anywhere from $20-$50, depending on where you live.


A leaking Schrader valve can be a pain, but it is nothing that cannot be fixed. With a little effort, you can have your car’s tires up and running in no time with the right tire pressure!

Just be sure to take all the necessary safety precautions while working on your car.

Now that you have all the necessary information regarding the causes of a leaking Schrader valve and how to fix it, you wouldn’t be caught in a tragic incident such as the one mentioned at the start of the blog.

Thomas Kersten

Hi, I am a passionate biker, and I have been riding for more than ten years and share my biking tips and tricks with the world. I've tested more than 300 bikes.

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