Yukon XL 4WD V8-5.3L (2011)
1. Lubricate a new O-ring seal (1) with Delco Supreme 11(R), GM P/N 12377967 (Canadian P/N 992667), or equivalent DOT-3 brake fluid from a
clean, sealed brake fluid container.
2. Install the O-ring seal to the HPA. Ensure the seal is fully seated in the groove of the HPA and is not twisted.
Caution: Refer to Fastener Caution See: Service Precautions/Vehicle Damage Warnings/Fastener Caution.
3. Install the HPA (1) to the brake modulator assembly.
Tighten the HPA to 30 Nm (22 lb ft).
4. Install the brake modulator assembly bracket and remove the support. Refer to Brake Pressure Modulator Valve Replacement .
