Master Cylinder Replacement

WARNING: This page is about a different car, the 2016 GMC Acadia, 2016 Chevrolet Traverse, and 2016 Buick Enclave. However, it is still accessible from the selected car via links, so may be relevant.

Fig 1: Master Cylinder

Courtesy of GENERAL MOTORS COMPANY

Callout	Component Name
WARNING: Refer to Brake Fluid Irritant Warning . CAUTION: Refer to Brake Fluid Effects on Paint and Electrical Components Caution . Preliminary Procedures Turn the ignition switch to the OFF position. Apply the brake pedal several times until the brake pedal becomes firm to deplete the power brake booster vacuum reserve. Remove the air cleaner cover and outlet duct. Refer to Air Cleaner Element Replacement . Using a suitable tool, remove the brake fluid from the brake master cylinder reservoir. Discard the brake fluid into an approved container. Disconnect the master cylinder fluid level sensor electrical connector.
1	Brake Pipe Fitting (Qty: 2) CAUTION: Refer to Fastener Caution . Procedure Remove any dirt or debris from the brake pipe fitting. Cap the brake pipe fittings to prevent brake fluid loss and contamination. Tighten 20 N.m (15 lb ft)
2	Brake Master Cylinder Nut (Qty: 2) Tighten 20 N.m (15 lb ft)
3	Brake Master Cylinder Assembly Procedure After the installation is complete, bleed the hydraulic brake system. Refer to Hydraulic Brake System Bleeding (Manual) Hydraulic Brake System Bleeding (Pressure) .
4	Brake Master Cylinder to Vacuum Booster Seal Procedure Inspect the brake master cylinder to vacuum booster seal for damage and replace if necessary. Ensure the brake master cylinder to vacuum booster seal is seated properly against the face of the flange on the brake master cylinder housing.