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What valve is releasing...Pumg Ques??(9 posts)

What valve is releasing...Pumg Ques??t-moore
May 2, 2003 8:04 PM
I have the Serfas pump with the steel braided line. Often, when adding air to tires, it appears that air is not going into the tire, eventhough I am pumping and the gauge in increasing. The gauge might read 140/150lbs, and all of a sudden, I hear the sound of a valve releasing. The gauge goes down to 95/100lbs, and now as I pump I can hear the air going into the tire. I pump up before every ride, and unless I lower the tire pressure to 75/80lbs this is what I get...
Presta valves stick oftenMR_GRUMPY
May 2, 2003 8:18 PM
Before putting air into the tire, open the presta valve and then press the stem to let just a very little bit of air out. That will unstick the valve.
I hould have been more specific..I always do that..t-moore
May 2, 2003 8:24 PM
Do you Install the Presta Nutpitt83
May 3, 2003 2:53 AM
With V rims, the nut pushes the pump head too far out from the valve. When pressure gets built up inside the chamber greater than that in the tire, the prest valve opens allowing airflow into the tire. Try going nutless and it may work out better for you.
I have the presta nuts..Thanks good tipt-moore
May 3, 2003 9:56 AM
Silca track pump!the best!nmthe bull
May 3, 2003 6:22 PM
It might be your floor pump..DINOSAUR
May 4, 2003 7:30 AM
I have the same problem with my old Advent floor pump. It's a pain in the you-know-what as if you aren't prepared it can cause havoc with my lower back. I bought a new Specialized pump and it did not have this problem, then I found out the gauge was ten pounds off. My options are to go with a better pump, such as a Blackburn or Silca, or just buy a tire pressure gauge to check my psi (a cheaper way to go). Probably sometime down the road I'll fork over the money for a real good floor pump, it's a good investment..

I've had this happen with several pumpsMel Erickson
May 4, 2003 4:40 PM
Including my current Joe Blow floor pump. It's basically a sticking valve and sometimes even releasing a small amount of air from the valve before you attach the pump doesn't cure the problem. I've found a simple wiggle of the pump head while it's attached to the valve will unstick it. You can hear a snap as the valve unsticks. Problem solved without giving you hemorrhoids.
my pump works great!the bull
May 4, 2003 5:11 PM
Its 20 years old!The guy I bought my Bottechia gave it to me with the bike.I can still rebuild it some day if it wears out!
Its made by silica they call it a track pump!