Inspect the master cylinder reservoir for cracks or deformities. If found, replace the reservoir.
Clean the reservoir with clean denatures alcohol or equivalent.
Dry the master cylinder reservoir with non-lubricated, filtered air.
Lubricate the new seals and the reservoir bayonets with new 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 seals, making sure they are fully seated.
Install the reservoir onto the master cylinder by pressing straight down by hand until the pins holes are aligned.
Press straight down by hand until pin holes are aligned.
Carefully tap in the master cylinder reservoir retaining pins to secure the reservoir.