We hope everyone is having some good travel experiences seeing this
great country, visiting relatives or doing what you do in your
Foretravel. After being part of numerous ladies Driving Schools, I was amazed
at how interested the ladies were when I conducted the walk
around explaining some of the mechanical things they never heard
of but are so important. One thing that stood out was when I
explained and demonstrated how the air system works, and what to
look for should that dreaded warning bell sound. Most, if not
all, never knew what is involved in how the air system controls
the braking system and how important it is to know what to look
for if the warning bell does ring. So, I thought it would be a
good reminder to the graduates of the school and to those unable
to attend the school, understand how the system works. Now all
you men who read this, let your wife read it also, don't hog the
information for yourself.
Here is a quick checklist on how to test the air and brake systems.
Note: You should be on level ground
with the wheels chocked for some parts of this checklist.
Low air warning system test.
Start engine and build up pressure, turn
engine off, turn ignition switch back on, pump brake pedal to
reduce air pressure until warning light and beeper comes on.
(Should come on about
Emergency/parking brake test.
Push brake knob in, continue reducing air
pressure. The parking brake knob should "pop out" to indicate
the parking brake is activated (25-35 psi). Start engine let air
pressure build up until low air pressure warning beeper stops
(70-80 psi). Push
parking brake knob in
& attempt to move coach forward. Should move
freely without any brake drag.
Air pressure build up test.
Continue to let the air pressure build; it should not take
more than four minutes for the air pressure to go from
discharged (5-20 psi)
to between 120 and 130 psi.
Governor cut-in/cut-out test.
When air pressure gets between 120-130 psi,
the governor should cut out. The dash gauge needle stops moving.
When the needle stops, pump the brake pedal to reduce the air
pressure to 80 psi, release the brake pedal, the compressor
starts pumping air (cutting in)! watch for needle movement. The
air governor causes the air compressor to cut in between
Air leak test.
Stop engine, parking brake on, and
transmission in neutral. The air pressure must not drop more
than 2 psi in the first minute. Release the parking brake; the
air pressure must not drop more than 2 psi in this second
minute. Apply service brake and hold it. The initial pressure
drop must not be more than 10 psi. Continue to hold the pedal
down for one full minute. The pressure should not drop by more
than 3 psi.
Service brake test.
Release parking brake and drive forward slowly, apply service
brake sharply while holding the steering wheel lightly to determine whether the brakes apply
without pulling to either side. Drive forward slowly again and
apply the service brake gradually to check for smoothness.
Now that you know how the system works
normally, you will be able to quickly diagnose and respond
quickly before any mishap could occur.
See ya down the road, Jack and Bobbie