Yukon 4WD V8-5.3L (2008)
Vacuum Brake Booster: Service and Repair
Power Vacuum Brake Booster Replacement
Removal Procedure
Caution: Refer to Brake Fluid Irritant Caution .
Notice: Refer to Brake Fluid Effects on Paint and Electrical Components Notice .
1. Apply the park brake.
2. Deplete the vacuum reserve in the vacuum booster by applying the brake pedal 3 times or until the brake pedal becomes firm.
3. Remove the electrical connectors for the DOD sensor (1) and the active booster connector (2).
4. Remove the vacuum hose from the check valve (3).
5. Remove the 2 master cylinder nuts.
Important:
*
It is not necessary to disconnect the brake pipes from the master cylinder.
*
Ensure the O-ring vacuum seal is on the master cylinder after removal.
6. Position the master cylinder aside and secure with heavy mechanics wire or equivalent.
