Enclave AWD V6-3.6L (2009)
Intake Manifold Vacuum Port
Brake Hose Tee
Vacuum Draw Direction
8. Install a new check valve (2) to the brake booster hose that routes to the intake manifold vacuum port. Ensure that the arrow on the check valve (2)
points toward the intake manifold vacuum port and away from the brake hose tee. Refer to illustration. Ensure the hose is pushed over the check
valve barbs and onto the serrated portion of the check valve.
9. Connect the second piece of brake booster hose that routes to the intake manifold vacuum port (6) to the check valve (2).
10. Connect the second piece of brake booster hose that routes to the power brake booster auxiliary pump to the check valve (1).
Notice
If you are unable to pull the protective wrap (5) over the brake check valve (1), remove the protective wrap (5) from the brake hose. Cut the
protective wrap (5) into two pieces. Ensure one of the two pieces of protective wrap (5) is cut to 150 mm (6 in) in length. Position the 150 mm (6
in) piece of protective wrap between the brake vacuum hose tee and the brake check valve directly over the aluminum manifold. Position the
second piece of the protective wrap (5) between the brake check valve and the power brake booster auxiliary pump (3).
11. Install protective wrap (5) over the brake booster hose that routes to the power brake booster auxiliary pump (3). Ensure the protective wrap
covers the area of the hose that is directly over the aluminum manifold.
12. Connect the quick connect (4) to the power brake booster auxiliary pump (3).
13. Install the fuel injector sight shield (engine cover). Refer to Fuel Injector Sight Shield Replacement in SI.
14. Start the engine and let it idle for 1 minute.
15. Apply brake pedal 3-5 times to ensure vacuum is getting to the brake booster. If a hard brake pedal is experienced, refer to steps 7-8 to check the
brake check valve orientation.
Owner Letter
Owner Letter
June 2009
Dear General Motors Customer:
We have learned that your 2009 model year Buick Enclave, Chevrolet Traverse, GMC Acadia, or Saturn OUTLOOK vehicle may have a condition in
which the power brake assist may be temporarily reduced when the vehicle is operated in temperatures of -5° to -49°F (-21° to -45°C). In these extreme
cold temperatures, the opening of one or both of the power brake booster vacuum check valves may be delayed, resulting in reduced power brake assist.
As the valve(s) warm, which could take more than 1 minute, the valve operation returns to normal and full power brake assist returns.
