Vacuum Brake Booster Check Valve: Service and Repair

Power Brake Booster Vacuum Check Valve and Hose Replacement

Removal Procedure

1. Turn the ignition switch to the OFF position.




2. Apply and release the brake pedal several times until the brake pedal becomes firm to deplete the brake booster vacuum reserve.
3. Remove the windshield washer solvent heater, if equipped. Refer to Windshield Washer Solvent Heater Replacement (Traverse) (Service and Repair)Windshield Washer Solvent Heater Replacement (Acadia, Enclave, OUTLOOK) (Service and Repair).
4. Disconnect the power vacuum brake booster check valve and hose assembly (1) from the brake booster.




5. Remove the fuel injector sight shield. Refer to Fuel Injector Sight Shield Replacement (Service and Repair).
6. Release the vacuum hose routing clip (1) from the intake manifold ball stud.




7. Disconnect the power vacuum brake booster hose (1) from the intake manifold vacuum port.
8. Release the quick connect (2) from the power brake booster auxiliary pump.
9. Remove the vacuum brake booster hose assembly from the vehicle.




10. Remove the vacuum brake booster hose (1) and clamp (2) from the check valve (3).

Installation Procedure




1. Install the vacuum brake booster hose (1) and clamp (2) to the check valve (3).
If necessary, a small amount of denatured alcohol can be used as an assembly aid for installing the vacuum hose to the check valve. Do not use soap.




2. Install the vacuum brake booster hose assembly to the vehicle.
3. Connect the power vacuum brake booster hose (1) to the intake manifold vacuum port.
If necessary, a small amount of denatured alcohol can be used as an assembly aid for installing the vacuum hose to the manifold vacuum port. Do not use soap.
4. Connect the quick connect (2) to the power brake booster auxiliary pump.




5. Connect the vacuum hose routing clip (1) to the intake manifold ball stud.
6. Install the fuel injector sight shield. Refer to Fuel Injector Sight Shield Replacement (Service and Repair).




7. Connect the power vacuum brake booster check valve and hose assembly (1) to the brake booster.
If necessary, a small amount of denatured alcohol can be used as an assembly aid for installing the check valve to the booster grommet. Do not use soap.
8. Install the windshield washer solvent heater, if equipped. Refer to Windshield Washer Solvent Heater Replacement (Traverse) (Service and Repair)Windshield Washer Solvent Heater Replacement (Acadia, Enclave, OUTLOOK) (Service and Repair).