Installation Procedure

Fig 1: HPA O-ring Seal

GM2037951

Courtesy of GENERAL MOTORS COMPANY

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.

Fig 2: HPA

GM2037950

Courtesy of GENERAL MOTORS COMPANY

CAUTION:

Refer to Fastener Caution .

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: View Of Brake Modulator Manual Pressure Relief Valve

GM2037952

Courtesy of GENERAL MOTORS COMPANY

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 . Follow the procedure completely to ensure the learn procedure for the pressure and travel sensors has occurred.