Chevrolet 2007 TrailBlazer Owner's Manua page 528

Parking Brake and Automatic
Transmission Park (P) Mechanism Check
CAUTION:
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When you are doing this check, your
vehicle could begin to move. You or
others could be injured and property
could be damaged. Make sure there is
room in front of your vehicle in case it
begins to roll. Be ready to apply the
regular brake at once should the vehicle
begin to move.
528
Park on a fairly steep hill, with the vehicle facing
downhill. Keeping your foot on the regular
brake, set the parking brake.
•
To check the parking brake's holding
ability: With the engine running and
transmission in NEUTRAL (N), slowly remove
foot pressure from the regular brake pedal.
Do this until the vehicle is held by the parking
brake only.
•
To check the PARK (P) mechanism's holding
ability: With the engine running, shift to
PARK (P). Then release the parking brake
followed by the regular brake.
Contact your GM Goodwrench
required.
Underbody Flushing Service
At least every spring, use plain water to flush any
corrosive materials from the underbody. Take
care to clean thoroughly any areas where mud and
other debris can collect.
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dealer if service is