Colorado 2WD L5-3.7L (2007)
1. Inspect the reservoir for cracks or deformation. If found, replace the reservoir.
2. Clean the reservoir with denatured alcohol, or equivalent.
3. Dry the reservoir with non-lubricated, filtered air.
4. Lubricate the new seals and the outer surface area of the reservoir-to-housing barrels with Delco Supreme 11(R) (GM P/N 12377967) or
equivalent DOT-3 brake fluid from a clean, sealed brake fluid container.
5. Install the lubricated seals, make sure they are fully seated.
6. Install the reservoir to the master cylinder by pressing the reservoir straight down on the master cylinder until the pin holes are aligned.
7. Carefully tap the reservoir retaining pins into place to secure the reservoir.
8. Install the cover on the reservoir.
9. Remove the master cylinder from the vice.
10. Install the master cylinder.
Master Cylinder Replacement
Master Cylinder Replacement
Removal Procedure
Caution: Refer to Brake Fluid Effects on Paint and Electrical Components Notice.
Caution: Refer to Brake Fluid Irritant Caution.
1. Using the proper tool, remove the brake fluid from the master cylinder reservoir.
2. Remove fluid lever sensor electrical connector.
3. Remove the brake lines from the ABS module to the master cylinder.
Important: Install a rubber cap or plug to the exposed brake pipe fitting in order to prevent brake fluid loss and contamination.
4. Install the rubber cap and or plugs the brake lines.
5. Remove the mounting bolts from the master cylinder.
6. Remove the master cylinder.
