Air powered booster pump?
On 2014-12-18, Lloyd E. Sponenburgh lloydspinsidemindspring.com wrote:
Ignoramus11878 fired this volley in
:
I think that there is a pressure loss at the Schrader valve or some
such, like a spring that needs to be pushed by air.
Not when a chuck is engaged on a Schrader, no. Both the chuck's valve and
the Schrader valve are fully opened when fully engaged.
More likely is a bad face washer in the chuck, causing a leak. An
expanding-collar lock-on chuck can solve that, and make the job easier,
too.
Lloyd, I had the same problem as the OP, the last 10 PSI are very
difficult to push into a tire.
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