GM 25778605
Brake Booster

Begin the vacuum Brake Booster replacement task by securing power off the vehicle to defend from ebcm/ebtcm malfunction. Supported under the vehicle position your left front wheel assembly to access its installation point. Use a socket to remove 3 wireless ebcm/bpmv bracket nuts on the left front wheelhouse and lower the entire automobile. Pull the ebcm electrical connector back while discharging Brake Booster vacuum through the vacuum check valve on its grommet retaining spot without breaking the vacuum hose connection. Insert bleeder valve caps into each of the 4 brake pipes at the bpmv to stop fluid loss while maintenance. Remove the vacuum Brake Booster master cylinder nuts then detach the ebcm/bpmv bracket assembly together with the brake master cylinder. Take out the two Brake Pedal assembly to cowl nuts and remover the brake apply sensor and closeout panel from the electrical connector. To free the pushrod from the Brake Pedal pin remove the connection parts including the pushrod retaining clip , wave washers and booster pushrod while tilting the booster to separate the parts without forceful side pressure. Take out the booster unit from the vehicle. Return the booster to its position and tilt the unit to match the pushrod with the Brake Pedal pin while installing without pressing too hard. Thread the Brake Booster pushrod retaining clip, wave washers, and Brake Pedal pushrod connections back to the Brake Pedal pin. Install the 2 Brake Pedal assembly to cowl mounting nuts but tighten them to 15 nm (11 ft. Lbs.). Put back the electrical brake apply sensor connector before mounting the master cylinder gasket side with the jp1 and ebcm/bpmv bracket. Fasten the master cylinder screws to the vacuum Brake Booster securing unit with 25 nm (18 foot lbs.) torque. Continuing with the vehicle raised put on the 3 bracket assembly ebcm/bpmv nuts to the left wheelhouse, snug down to 10 nm (86 inch lbs.) before reattaching the wheel and tire apparatus left front. Seal-free brake pipe ends and match up the 4 connections to the bpmv unit. Tighten each connection to 20 nm (15 ft. Lbs). Plug in the electrical connector to its place on the ebcm and attach the vacuum Brake Booster check valve to the new grommet at the vacuum Brake Booster. Close the hydraulic brake system and adjust the Brake Pedal position sensor after doing this step.

Reattach the electrical connector to the brake apply sensor and install the closeout panel.

Remove the 2 nuts that attach the proportioning valve bracket.

Raise and support the vehicle, then remove the left front tire and wheel assembly.

Remove the closeout panel and the electrical connector from the brake apply sensor, followed by the 2 brake pedal assembly to cowl mounting nuts.

Turn the ignition to the OFF position to prevent damage to the EBCM/EBTCM when disconnecting the wiring harness.