Chevrolet B7 2001 Owner's Manual page 191

D
Inspect air parking brake chamber for leaks and
damage. Inspect lines and hoses for leaks, cracks,
chafing, etc. Also check all attachments for
tightness, wear or damage. Note: The spring
brake section of the rear brake diaphragms
-
are non serviceable.
D
Replace the air compressor filter element, mounted
on the air compressor. For remote air compressor
intake service, refer to air cleaner filter replacement.
(40) = Clean and lubricate air brake automatic slack
adjuster. Check pushrod travel and auto adjustment
operation. Have serviced if needed.
(41) = Air brake chamber service: Check operation,
mounting, clamps and air lines and check for leaks.
(44) = Air brake service: Remove, disassemble, clean
and inspect the safety valve, standard brake chamber,
quick release valve, quick release/double check valve
combination, parking brake control valve, double check
valve, pressure protection valve and alcohol injector.
Remove, disassemble and clean the application valve;
replace parts showing wear. Remove, disassemble,
clean and inspect the spring brake control valve;
replace rubber parts.
(46) = Tighten the wheel stud nuts to the specified
torque values at 1,000 miles (1 600 km). Thereafter,
tighten them 1,000 miles (1 600 km) after each time the
wheel is removed. See "Tightening the Wheel Nuts" in
the Index.
(47) = Service is required now if you operate under any
of these Short Trip/City conditions:
D
Most trips are less than 5 to 10 miles (8 to 16 km).
This is particularly important when outside
temperatures are below freezing.
D
Most trips are through dusty areas.
D
You frequently tow a trailer.
D
The vehicle is operated at or near
maximum GVW ratings.
D
The vehicle is operated in hilly or
mountainous terrain.
(48) = Service is required now for all vehicles that
have not previously required service under the
Short Trip/City conditions.
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