Air Dryer - Chevrolet 2009 Kodiak Owner's Manual

Air Brake Systems
If the vehicle has air brakes, it is important to get rid of
moisture in the system. Moisture will damage the system
if it is not removed daily.
There are two ways to do this. One is automatic through
the air brake vehicle's air dryer with integral automatic
moisture ejector that purges air from the system through
a self-contained reservoir. The other way to drain
moisture from the air brake system is to manually activate
drain valves at each reservoir. Drain the air reservoirs
occasionally to be sure the air dryer is working properly.
Drain the air brakes at full system pressure. To be sure of
full pressure, check the air pressure gage. It should read
at least 100 psi (692 kPa).
5-56

Air Dryer

If the vehicle has air brakes, it has an air dryer mounted
on the passenger side frame rail. This collects and
removes dirt, moisture, or other foreign matter from the
air prior to entering the brake system. The dryer also
acts as a moisture ejector. It automatically ejects
the moisture when the compressor cycles. The purge
tank has a manual drain valve that must be drained
every day. See "Air Brake Systems" for the manual drain
procedure.
The dryer has a filter that needs changing at intervals.
See Scheduled Maintenance on page 6-5 for more about
servicing this filter.