GMC C series 2002, Owner'S Manual

Page: 238 / 324

6-35
Air Brake Systems (If Equipped)
If you have air brakes, it is important to get rid of
moisture in the system. Moisture will damage your
system if it isn’t removed daily.
There are two ways to do this. One is automatic if your
air
-
brake vehicle has the optional moisture ejector.
If your vehicle doesn’t have that option, however,
you must drain the air reservoirs every day.
Drain them at full system
pressure. To be sure
you’re at full pressure,
check your air pressure
gage. It should read at
least 100 psi (692 kPa).
Moisture Ejector(Option)
If you have air brakes with a moisture ejector, the valve
automatically ejects moisture from the reserve tank
when the air compressor cycles.
Air Dryer (Option)
If your vehicle has air brakes, it may have an air dryer.
This collects and removes dirt, moisture or other foreign
matter from the air prior to entering the brake system.
It is mounted on the left frame rail.
If your dryer is a
Bendix
-
Westinghouse,
it has a filter that you
need to change at intervals.
See your Maintenance
Schedule for more about
servicing this filter.