Yukon XL 4WD V8-5.3L (2011)
1. Install a new power vacuum brake booster gasket.
2. Install the power vacuum brake booster.
Caution: Refer to Fastener Caution See: Service Precautions/Vehicle Damage Warnings/Fastener Caution.
3. Install the power vacuum brake booster nuts (1) and tighten to 33 Nm (24 lb ft).
4. Connect the brake booster pushrod to the brake pedal pin.
5. Install the stoplamp switch (1).
6. Connect the stoplamp switch electrical connector.