Service Information
Brake Master Cylinder Reservoir Seal[3x]
Warning: The battery must be disconnected to prevent the brake master cylinder from pressurizing the hydraulic system during its automated self diagnostic tests that can possibly occur when a door is opened or the key transmitter is activated. Failure to follow this precaution may cause personal injury.
Warning: Brake Fluid Irritant Warning
- Open the hood.
- Body Side Upper Rear Applique Bolt(2)»Remove
- Front Fender Upper Rear Molding- Left Side(1)»Remove
- Drain and properly dispose of the brake fluid in the master cylinder reservoir.
- Check the 12 volt battery voltage with a digital multimeter before disconnecting any battery cables leads. If the voltage is 13.5 volts or above, the Battery Maintenance Mode is active. The technician must wait for the T18 battery charger to deactivate before disconnecting the battery negative cable. Charging System Description and Operation
- Disconnect the battery negative cable.Battery Negative Cable Disconnection and Connection
- Electrical Connector@Brake Fluid Level Indicator Switch»Disconnect
- Brake Fluid Level Indicator Switch(1)»Remove
- Disconnect brake master cylinder reservoir hose (1) and cap the hose.
- Brake Master Cylinder Reservoir Bracket Nut(1)»Remove[2x]
- Brake Master Cylinder Reservoir- Upper(1)»Remove
- Brake Master Cylinder Bolt(1)»Remove[2x]
- Brake Master Cylinder Reservoir- Lower(1)»Remove and DISCARD
- Brake Master Cylinder Reservoir Seal(1)»Remove and DISCARD[3x]
Warning: Always ensure the Battery Maintenance Mode is inactive before disconnecting the low voltage 12 volt battery (or batteries). This mode can be active with the ignition off, regardless of whether the vehicle charging cord is plugged in or not. When this mode is active, the on-board high voltage battery charger(s) will energize the 12 volt battery cables and charge the 12 volt battery (or batteries). Disconnecting any battery cables while this mode is active may result in an electrical shock or a burn from hot battery cable leads.
Warning: Do NOT clamp the brake master cylinder reservoir tube to stop the flow of brake fluid. Doing so could cause damage to the tube, degradation of braking performance, and potential loss of brakes. Failure to follow this warning may cause component damage or personal injury.
- Brake Master Cylinder Reservoir Seal(1)»Install NEW[3x]
- Brake Master Cylinder Reservoir- Lower(1)»Install NEW
- Brake Master Cylinder Bolt(1)»Install and tighten[2x]—Fastener Specifications
- Brake Fluid Level Indicator Switch(1)»Install
- Electrical Connector@Brake Fluid Level Indicator Switch»Connect
- Remove the cap and connect the brake master cylinder quick connect fitting (1).
- Position the brake master cylinder reservoir - upper (1) , on to the 2 pins on the plenum panel bracket.
- Fill the brake master cylinder reservoir to the maximum-full level with GM approved brake fluid from a clean sealed brake fluid container. Brake Master Cylinder Reservoir Filling
- Connect the battery negative cable.Battery Negative Cable Disconnection and Connection
- Bleed the brake system.Hydraulic Brake System Bleeding
- Check for brake system leaks.
- Brake Master Cylinder Bracket- Upper»Install
- Brake Master Cylinder Reservoir Bracket Nut(1)»Install and tighten[2x]—Fastener Specifications
- Front Fender Upper Rear Molding- Left Side(1)»Install
- Body Side Upper Rear Applique Bolt(2)»Install and tighten—Fastener Specifications
- Close the hood.
Caution: Fastener Caution
Note: Necessary to fill the brake master cylinder reservoir and bleed the brake system before installing the brake master cylinder bracket upper due to lack of clearance underneath the cowl panel.