Brake Adjustment/Slack Adjuster; Brake Systems - Back-Up - Holiday Navigator 2003 Owner's Manual

The motorhome is equipped with automatic slack adjusters. As brake lining
wears, the slack adjusters will automatically ratchet on the return stroke as
needed. This ratchet action will keep the brake lining at proper adjustment.
Brake adjustment should not be necessary. Indications of a vehicle needing
possible brake adjustment may be noticed by the park brake not holding on a
hill, or gradual loss of braking power. Automatic slack adjusters and the
connecting S-camshaft require periodic lubrication.
NOTE: Replacement parts should be of the same original
equipment size and type. Mixing brake components may result
in unequal braking action. Brake adjustments are part of normal
maintenance of the motorhome. Brake adjustments are not
covered by the manufacturer.
WARNING: Brake lining may contain asbestos material and
should only be serviced by qualified service technicians who are
trained in the appropriate precautionary procedures. If any loss
of braking effectiveness, or abnormal braking indications, are
noticed the brakes and slack adjusters should be inspected by a
qualified brake technician.
The motorhome air braking system is equipped with several back-up safety
systems and warning alarms in case of an air system failure. Refinements to
air braking systems have been instituted with safety as top priority. For
example: should the air compressor fail to charge the air system and the low
air gauge readings go undetected, a low air pressure warning buzzer will sound
and low air pressure dash warning indicator lamp will illuminate. These
warning indicators occur at approximately 65 psi. This will alert the operator
of an impending situation. If the motorhome is allowed continued operation,
the pneumatic emergency spring brake relay valve installed in the air system
senses the low air pressure condition. The emergency spring brake relay valve
will release the air charge from the spring brake air chambers on the rear drive
axle. In this case, the park brakes will automatically apply at approximately 30
psi. This safety back-up system acts as an automatic emergency brake system.
Another back up safety is the air system separation of the front and rear
brakes, implemented by using two air tanks. One tank is located in the front
and the other is located in the rear. This separation allows the front air tank to
operate the front brakes; the rear tank operates the rear drive axle brakes and
tag axle brakes if equipped with a tag axle. This tank division gives reassurance
in case one tank experiences a failure of an accessory air item allowing the
compressed air to escape.
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N A V I G A T O R 2 0 0 3
Chassis Information
Brake Adjustment
/Slack Adjuster
Brake Systems
- Back-Up
1 0 • 3 9 1