Originally Posted by
Cougrrcj
I got rid of the Primus frame pump that came with my bike when it was new because I hated loosing air when disconnecting the hose on Schrader valves. The quick connect head of the Zefal made things much simpler. Now my bikes have Presta valves, but I still don't see the need to screw a hose on when the cam lock fitting is simpler. Toe-MAY-toe, toe-MAH-toe. YMMV, results not typical, and other such caveats...
You weren't losing air out of the tire, what you heard was the air pressure in the pump being released, the valve in a schrader valve snaps shut fast due to the spring with no more than 1/8th of a pound of air lost unless the valve sticks for some reason, or you remove the chuck too slowly and and allow the air in the tube to escape. Schrader valves are extremely reliable and are used in all sorts of applications including very high pressure applications and in underwater applications where the lost of air when connecting and disconnecting is critical.
So you threw away a pump for no reason...sorry.