>well, since you can buy the trailers for $100 or less just buy another
>one for parts/tires for your truck!!!!
>as to the system in general, gas motors under high output don't have
>much manifold vacuum for brake systems. most diesels have no manifold
>vacuun at all. with air alone your brakes lock up if you loose air ( bad
>if someone is shooting at you ) with air over hydraulic you have a great
>amount of boost and still have some brakes with very low or even no air.
>
These brake units go under many names but they're really just what you'd call a
(brake) servo if it was in a car. Using vacuum only 14.7psi is available to
give added effort but with compressed air nearly ten times that is common, for a
similar sized package to a car huge boosts can be obtained using compressed air.
I have the chart here for FV623 "Airpacks" (servos), the graph is a straight
line, 60psi of pedal generated input pressure gives 800psi in the brakes and
170psi at the input results in 2160psi all with the set 118psi of air in the
system.
Richard
(Southampton UK)
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