Hummer H1 (2006+). Manual - part 22
1-40
General Information, Lubrication and Maintenance
________________
Master Cylinder Fluid Level Check
CAUTION: Use DOT 3 brake fluid only. Failure to use the proper fluid may affect brake performance or damage brake compo-
nents.
Check master cylinder fluid level monthly. Correct fluid level is to within 1/2 in. (13 mm) from the “MAX” indicator.
Clean the master cylinder cap and exterior before checking fluid level. Dirt on the cap must not be allowed to enter the reservoirs.
Add DOT 3 fluid if necessary and reinstall the cap (Figure-1-37).
Figure 1-37: Master Cylinder Cap Location
Wheels/Tires/CTIS
Inspect tire and wheel condition. Look for loose wheel nuts and rim stud nuts, or dented, deformed wheel rims. Note tire tread wear
and sidewall condition. If the vehicle is used for extensive off road operation, check the sidewalls for bulges, bead damage, cuts,
fabric breaks.
If the tire treads are worn, note type of wear. If wear is only on one shoulder, toe setting or camber may be incorrect. If tires are
scalloped or worn at crown only, or both shoulders, inflation pressures are probably incorrect.
If the vehicle is equipped with CTIS, cycle the system and check operation. Verify tire inflation pressures with an accurate gauge.
Serpentine Belt
Replace the belt if frayed, cut, or torn. Minor, small surface cracks within the belt grooves are normal. Do not replace the belt un-
less cracks extend all the way through or across the belt face.
Body Lubrication Points
Every 6 months or 6,000 mi (9,700 km), whichever occurs first, lubricate the: hood hinge, hood stops, tailgate hinges, door hinges,
door handles, parking brake lever and service brake pedal push rod stud (Figure-1-38). Suggested lubricants include engine oil or
ATF for hinges; LPS silicone lube for linkages, handles, and brake push rod; white grease for seat tracks, window regulators and
park brake lever. Door locks should use a graphite based lubricant such as Lock-Eze. Refer to the Recommended Fuel/Fluids/Lu-
bricants/Capacities section for more detailed lube information.
MASTER CYLINDER
CAP
MAX FLUID
LEVEL
INDICATOR
12-1-05