2 0 0 8 K n I G h t
chassIs InformatIon — 10
19
Make sure to check shock absorbers for
leaking hydraulic oil and worn or broken
end connectors. If a broken shock is
found, replace it immediately. The shock
absorber will normally limit the rebound
of an air spring and keep it from over
extending.
Check the tightness of all mounting
hardware (nuts and bolts). If loose,
tighten.
DO NOT
over-tighten.
Cleaning:
The approved cleaning method is to use
soap and water, methyl alcohol, ethyl alcohol
or isopropyl alcohol. Unapproved cleaning
methods include all organic solvents, open
flames, abrasive and direct pressurized steam
cleaning.
HeIgHt control valveS
Height Control Valves (HCV)
inflate or
deflate air springs to maintain proper suspension
height throughout the load range. Two Height
Control Valves are installed at the rear drive
axle to control rear suspension height and left
or right tilt of the motorhome. A separate HCV
is installed to control front suspension height.
The three HCVs mount to the main frame of the
motorhome, above the axles, with a linkage rod
connecting the valve to the axle.
Actuating components inside of the valves
are oil dampened to reduce valve reaction to
momentary suspension bounce and rebound.
When a constant suspension change occurs, such
as a load change or weight transfer through a
sustained corner, the valve reacts by adding or
purging air from the air springs as needed.
The air springs mount between the axle H-
frame assembly and the two main frame rails.
Air spring support plates mount to the main
frame and the H-frame. There is a specified
distance the air spring must maintain between
the mounting plates. Other than specified
distance between the plates will compromise
ride quality and handling, and affect shock
absorber travel, drive shaft angle, as well as
various other running gear components.
Brake SyStemS
Air Brakes
The air brake system on the motorhome differs
from a conventional automotive hydraulic
braking system and should be treated differently.
Proper maintenance and lubrication are the
keys to keeping the air brake system in proper
working order.
The air system supplies air to the foot brake,
or treadle valve. Pushing down on the treadle
valve supplies an air charge signal to a sealed
brake chamber that consists of a spring and air
bladder. The air charge signal pushes on the
bladder and extends a threaded rod connected to
the automatic slack adjuster. The slack adjuster
rotates the S-cam expanding the shoes against
the drum. Air disc brakes follow much the same
principle, with the exception of the threaded rod
directly activating calipers.
Consideration needs to be given to stopping
distances and air system pressures. The
motorhome requires longer stopping distances.
Each brake application uses air from the air
system, and engine speed is directly proportional
to how fast that air system is replenished.
Prepare for downhill grades. It may be necessary
to select a lower gear and/or use the exhaust
brake. Use individual short brake applications
down long hills, rather than “riding” the
brakes, to extend the life of the brake lining.
Avoid overheating the brakes. Hot brakes have
less stopping power. When maneuvering the
motorhome around small areas, or backing into
spaces, several individual brake applications
might be made. Watch the air gauge. When
preparing to back into a space swing the
motorhome so it is aligned with the parking slot
before backing up.
The air braking system on the motorhome is
equipped with a low air pressure warning system
safety feature. Should a low air condition arise
while the vehicle is in operation, a warning
buzzer will sound and a dash warning light will
illuminate at approximately 60 to 65 psi (pounds
per square inch) to alert the operator.
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