How to Replace a Wheel Valve (Fitted to a 'Schrader' type valve stem).

I had just pumped my tyre up. When I disconnected the foot pump, I noticed that some air was escaping. I placed my finger over the end of the valve and could hear the noise change as I moved my finger (from the escaping air). On closer inspection, I found that the valve was leaking.

Note:
This video applies to most wheels (or things) that are filled under pressure via a valve stem and a Schrader type valve… I.e. Cars, vans, trucks, motorcycles, wheelbarrows, bicycles, bikes, refrigeration, air conditioning systems, etc, etc.

Related Videos:
- How to Replace a Wheel Valve Stem - Easily Done at Home: https://youtu.be/amRLVjNNvKI
- Breaking a Tyre Bead - Two Easy Methods: https://youtu.be/y-6U2x7_d3s

More info can be found at:
https://do-it-up.com/vehicles/brakes-suspension/how-to-replace-a-wheel-valve/

How do I Replace the Valve?

It’s easy to change a wheel valve core (with the aid of a valve tool). Sometimes it can be a bit stiff to undo, but this is usually when the valve cap has gone missing…

Testing for Leaks on a Wheel Valve - What to look for?

We can test the valve and valve stem with some soapy water (as long as there is some air in the tyre). Use a brush to apply the soapy water. Just apply a small amount on the valve (the threaded part). As you can see from the image, a small leak will give you some bubbles.

If you see bubbles coming from any other part of the valve stem (not the threaded part at the top), or you can hear air is escaping when you move the valve stem with your finger. You could have a perished, or damaged valve stem. I have another article on replacing this… ‘How to Replace a Wheel Valve Stem‘ (link open in a new tab)…

Tools Required:

- Valve core removal tool.
- A screwdriver (or similar to release the air).

Notes:
If you’re lucky, you can sometimes remove a valve core with long nose pliers, a small screwdriver, or make your own tool. However, the tool is inexpensive and you’re more likely to have success with the correct tool for the job…

Replacing a valve is straightforward and only requires an inexpensive wheel valve removal tool. There are a few different looking valve tools available. Usually, the only difference between them is the number of added features. If you’re lucky, you may already have a wheel valve core removal tool. Sometimes you can find the tool included with air pumps and tyre pressure gauges. The image below shows a wheel valve removal tool on the end of a tyre pressure gauge. Note that the steel tools are usually a lot more robust than the plastic items. In the image below, the plastic tool is starting to get a bit chewed up…

How to Replace the Wheel Valve:

What Are You Trying to do?
The inside of the valve stem has a thread which the valve screws into. To remove the valve core, you have to unscrew the valve. The center of the valve (the round bit in the middle) passes through a hole in the valve tool, allowing the tool to grip the two flat edges (see the image below), and undo the valve.

Replacing the Wheel Valve:

Initial Check:
Before removing, check if the valve is tight (and that it’s not just a loose valve). If it is loose… Tighten and re-test for leaks with soapy water.

Removing the valve:
– For Safety. Let any remaining air out of the tyre. So the valve core doesn’t shoot out under pressure (when undone)…
- Press on the valve with a screwdriver, or something similar…
- Place the wheel valve removal tool on top of the valve. Insert the tool onto the flats of the valve (so the tool grips the valve) and unscrew.
- There may still be some trapped air that escapes whilst you unscrew the valve.
- Remove the valve, (if needed, long nose pliers may help in retrieving the valve from the hole).
- Insert a new valve and tighten.
- If defective, do not try and repair the existing valve! Failure (a sudden loss of air) could be dangerous at speed (a blowout). Always replace with a new valve.
- Re-inflate the tyre to the recommended pressure and retest (if necessary).
- Always replace the valve cap. This keeps dirt and moisture out, and protects the valve.

The Different Types of Wheel Valve:
There is usually only one type of valve fitted to an air filled wheel. A Schrader valve. Whereas with bicycles, there are two types, Schrader and Presta (Presta is smaller, for narrow bicycle wheel rims).

Hope this helps...

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