Installation Procedure

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Fig 1: O-ring Seal

Courtesy of GENERAL MOTORS CORP.

Lubricate a new O-ring seal (1) with Delco Supreme 11®, GM P/N 12377967 (Canadian P/N 992667), or equivalent DOT-3 brake fluid from a clean, sealed brake fluid container.
Install the O-ring seal to the HPA. Ensure the seal is fully seated in the groove of the HPA and is not twisted.

NOTE: Refer to Fastener Notice .

Fig 2: HPA

Courtesy of GENERAL MOTORS CORP.

Install the HPA (1) to the brake modulator assembly.
Tighten: Tighten the HPA to 30 N.m (22 lb ft).
Install the brake modulator assembly bracket and remove the support. Refer to Brake Pressure Modulator Valve Replacement .

Fig 3: Brake Modulator Manual Pressure Relief Valve

Courtesy of GENERAL MOTORS CORP.

Tighten the brake modulator manual pressure relief valve (1).
Tighten: Tighten the valve to 40 N.m (30 lb ft).
Perform the Antilock Brake System Automated Bleed Procedure . Follow the procedure completely to ensure the learn procedure for the pressure and travel sensors has occurred.