Bike tyre deflates when trying to detach the pump?

I have a bike with schrader valve and I am using the foot pump to inflate the tyres. The problem is when try to detach the pump the tyre deflates almost completely. What could be wrong tyre valve, pump.
Answer:

If you have a bad valve stem, you can either change the stem or just get a new tube. I usually opt for the new tube so that I will have one less thing to be concerned about when I'm riding. Tubes are cheap. Whenever Performance puts them on sale, I buy them by the handful. HTH

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Other answers

You have a bad valve stem. You can buy a stem remover and extra stems at any auto store. I just bought a little kit at Auto Zone for $5 that had the tool, stems, valve caps, and a small pressure guage. I had a bad valve stem on my truck that had a slow leak and that took care if it.

Bob A

tighten the valve first................

John S

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